inteldrm switches automatically to full brightness (100%)

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inteldrm switches automatically to full brightness (100%)

Volker Nowarra-2
Hi,

I have an older HP Elitebook 840 G1. It is a system with FN key to
change brightness: FN-F9 down, and FN-F10 up.
btw: both keys don't work... (I was running an OpenSuSE 15 before, they
worked to change brightness).
So I installed OpenBSD ("current" for other reasons), and reduced the
brightness at the restart of the machine, when it still displays the
BIOS message or the OpenBSD boot prompt.
The kernel would start normally, and display the blue messages. When the
inteldrm driver loads, the screens gets shortly dark, and then comes
back with the 4 blue lines of the inteldrm at the top, but now in full
brightness.
Everything else remains in full brightness, I start X automatically, and
when logged in, I can't change the brightness anymore. Neither with the
keys, nor with wsconsctl. It stays at 100%.
I can use wsconsctl on the command line, it responds with a change, but
actually brightness remains "full" (100%) - no changes:

$ doas wsconsctl display.brightness=50
display.brightness -> 50.00%
$ doas wsconsctl display.brightness=10
display.brightness -> 10.00%

$ xbacklight
10.000000
$ doas wsconsctl display.brightness=50
display.brightness -> 50.00%
$ xbacklight
50.000000

I installed these two versions of current (latest dmesg at the bottom),
both show the same behaviour...
OpenBSD 6.6-current (GENERIC.MP) #629: Mon Feb  3 17:41:16 MST 2020
OpenBSD 6.6-current (GENERIC.MP) #641: Sat Feb  8 12:51:51 MST 2020

WSCONSCTL output:
$ doas wsconsctl -a
keyboard.type=pc-xt
keyboard.bell.pitch=400
keyboard.bell.period=100
keyboard.bell.volume=50
keyboard.bell.pitch.default=400
keyboard.bell.period.default=100
keyboard.bell.volume.default=50
keyboard.repeat.del1=400
keyboard.repeat.deln=100
keyboard.repeat.del1.default=400
keyboard.repeat.deln.default=100
keyboard.ledstate=0
keyboard.encoding=fr
keyboard1.type=usb
keyboard1.bell.pitch=400
keyboard1.bell.period=100
keyboard1.bell.volume=50
keyboard1.bell.pitch.default=400
keyboard1.bell.period.default=100
keyboard1.bell.volume.default=50
keyboard1.repeat.del1=400
keyboard1.repeat.deln=100
keyboard1.repeat.del1.default=400
keyboard1.repeat.deln.default=100
keyboard1.ledstate=0
keyboard1.encoding=fr
mouse.type=ps2
mouse.reverse_scrolling=0
mouse1.type=usb
mouse1.reverse_scrolling=0
display.type=inteldrm
display.width=1366
display.height=768
display.depth=32
display.fontwidth=12
display.fontheight=24
display.emulations=vt100
display.screentypes=std
display.focus=4
display.brightness=100.00%
display.screen_on=250
display.screen_off=0
display.vblank=off
display.kbdact=on
display.msact=on
display.outact=on


DMESG:
OpenBSD 6.6-current (GENERIC.MP) #641: Sat Feb  8 12:51:51 MST 2020
[hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8465674240 (8073MB)
avail mem = 8196620288 (7816MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xbbe3f000 (32 entries)
bios0: vendor Hewlett-Packard version "L71 Ver. 01.21" date 09/03/2014
bios0: Hewlett-Packard HP EliteBook 840 G1
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP HPET APIC MCFG TCPA SSDT SSDT SLIC FPDT BGRT
SSDT SSDT SSDT SSDT SSDT ASF!
acpi0: wakeup devices LANC(S5) EHC1(S3) XHC_(S3) PCIB(S5) NIC_(S5)
RP04(S5) WNIC(S5)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1796.08 MHz, 06-45-01
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.85 MHz, 06-45-01
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.85 MHz, 06-45-01
cpu2:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.85 MHz, 06-45-01
cpu3:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 20, 40 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xe0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEGP)
acpiprt2 at acpi0: bus 1 (RP01)
acpiprt3 at acpi0: bus 2 (RP04)
acpiprt4 at acpi0: bus 3 (RP06)
acpiprt5 at acpi0: bus -1 (RP07)
acpiprt6 at acpi0: bus -1 (RP08)
acpiec0 at acpi0
acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: APPR, resource for HDEF
acpipwrres1 at acpi0: COMP, resource for COM1
acpipwrres2 at acpi0: LPP_, resource for LPT0
acpipwrres3 at acpi0: PXP6, resource for RP06
acpitz0 at acpi0: critical temperature is 128 degC
acpitz1 at acpi0: critical temperature is 128 degC
acpitz2 at acpi0: critical temperature is 128 degC
acpitz3 at acpi0: critical temperature is 128 degC
acpitz4 at acpi0: critical temperature is 128 degC
acpitz5 at acpi0: critical temperature is 128 degC
acpitz6 at acpi0: critical temperature is 128 degC
acpitz7 at acpi0: critical temperature is 128 degC
"HPQ6001" at acpi0 not configured
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
acpicmos0 at acpi0
"PNP0A06" at acpi0 not configured
"SYN3003" at acpi0 not configured
"HPQ6007" at acpi0 not configured
acpibat0 at acpi0: BAT0 model "Primary" serial 45286 2014/10/10 type
LIon oem "Hewlett-Packard"
acpibat1 at acpi0: BAT1 not present
acpiac0 at acpi0: AC unit online
acpibtn0 at acpi0: SLPB
acpibtn1 at acpi0: LID_
"PNP0C14" at acpi0 not configured
tpm0 at acpi0: GTPM, can't find address
"INT33A0" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD01
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 1796 MHz: speeds: 2501, 2500, 2400, 2200, 2100,
1900, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 800, 775 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x0b
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x0b
drm0 at inteldrm0
inteldrm0: msi
azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x0b: msi
azalia0: No codecs found
xhci0 at pci0 dev 20 function 0 "Intel 8 Series xHCI" rev 0x04: msi,
xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev
3.00/1.00 addr 1
"Intel 8 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
em0 at pci0 dev 25 function 0 "Intel I218-LM" rev 0x04: msi, address
ec:b1:d7:94:7b:f3
azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi
azalia1: codecs: IDT/0x76e0
audio0 at azalia1
ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4
pci1 at ppb0 bus 1
ppb1 at pci0 dev 28 function 3 "Intel 8 Series PCIE" rev 0xe4: msi
pci2 at ppb1 bus 2
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7260" rev
0x73, msi
ppb2 at pci0 dev 28 function 5 "Intel 8 Series PCIE" rev 0xe4: msi
pci3 at ppb2 bus 3
rtsx0 at pci3 dev 0 function 0 "Realtek RTS5227 Card Reader" rev 0x01: msi
sdmmc0 at rtsx0: 4-bit, dma
ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 0 int 17
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev
2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 8 Series AHCI" rev 0x04: msi,
AHCI 1.3
ahci0: port 0: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, Samsung SSD 850, EMT0>
naa.5002538d40d7ae8d
sd0: 476940MB, 512 bytes/sector, 976773168 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic
0 int 18
iic0 at ichiic0
iic0: addr 0x2c 80=04 81=04 82=04 83=04 84=04 85=04 86=04 87=04 fd=01
words 00=ffff 01=ffff 02=ffff 03=ffff 04=ffff 05=ffff 06=ffff 07=ffff
spdmem0 at iic0 addr 0x50: 8GB DDR3 SDRAM PC3-12800 SO-DIMM
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
uhub2 at uhub0 port 3 configuration 1 interface 0 "SMSC USB2134B" rev
2.10/50.00 addr 2
uhidev0 at uhub2 port 4 configuration 1 interface 0 "Telink Wireless
Receiver" rev 1.10/1.00 addr 3
uhidev0: iclass 3/1, 5 report ids
ums0 at uhidev0 reportid 1: 5 buttons, Z dir
wsmouse1 at ums0 mux 0
uhid0 at uhidev0 reportid 3: input=4, output=0, feature=0
uhid1 at uhidev0 reportid 4: input=1, output=0, feature=0
uhid2 at uhidev0 reportid 5: input=0, output=0, feature=7
uhidev1 at uhub2 port 4 configuration 1 interface 1 "Telink Wireless
Receiver" rev 1.10/1.00 addr 3
uhidev1: iclass 3/1
ukbd0 at uhidev1: 8 variable keys, 6 key codes, country code 33
wskbd1 at ukbd0 mux 1
ugen0 at uhub0 port 5 "Validity Sensors product 0x003f" rev 1.10/1.04 addr 4
uvideo0 at uhub0 port 7 configuration 1 interface 0 "DDMDF029I7F45V HP
HD Webcam" rev 2.00/0.08 addr 5
video0 at uvideo0
uhub3 at uhub0 port 12 configuration 1 interface 0 "SMSC USB5534B" rev
3.00/50.00 addr 6
sdmmc0: can't enable card
uhub4 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching
Hub" rev 2.00/0.04 addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (12d950e117e78254.a) swap on sd0b dump on sd0b
inteldrm0: 1366x768, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wskbd1: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
iwm0: hw rev 0x140, fw ver 17.3216344376.0, address f8:16:54:1e:d9:80
syncing disks... done
rebooting...
OpenBSD 6.6-current (GENERIC.MP) #641: Sat Feb  8 12:51:51 MST 2020
[hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8465674240 (8073MB)
avail mem = 8196620288 (7816MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xbbe3f000 (32 entries)
bios0: vendor Hewlett-Packard version "L71 Ver. 01.21" date 09/03/2014
bios0: Hewlett-Packard HP EliteBook 840 G1
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP HPET APIC MCFG TCPA SSDT SSDT SLIC FPDT BGRT
SSDT SSDT SSDT SSDT SSDT ASF!
acpi0: wakeup devices LANC(S5) EHC1(S3) XHC_(S3) PCIB(S5) NIC_(S5)
RP04(S5) WNIC(S5)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1796.08 MHz, 06-45-01
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.85 MHz, 06-45-01
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.86 MHz, 06-45-01
cpu2:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.85 MHz, 06-45-01
cpu3:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 20, 40 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xe0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEGP)
acpiprt2 at acpi0: bus 1 (RP01)
acpiprt3 at acpi0: bus 2 (RP04)
acpiprt4 at acpi0: bus 3 (RP06)
acpiprt5 at acpi0: bus -1 (RP07)
acpiprt6 at acpi0: bus -1 (RP08)
acpiec0 at acpi0
acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33),
C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: APPR, resource for HDEF
acpipwrres1 at acpi0: COMP, resource for COM1
acpipwrres2 at acpi0: LPP_, resource for LPT0
acpipwrres3 at acpi0: PXP6, resource for RP06
acpitz0 at acpi0: critical temperature is 128 degC
acpitz1 at acpi0: critical temperature is 128 degC
acpitz2 at acpi0: critical temperature is 128 degC
acpitz3 at acpi0: critical temperature is 128 degC
acpitz4 at acpi0: critical temperature is 128 degC
acpitz5 at acpi0: critical temperature is 128 degC
acpitz6 at acpi0: critical temperature is 128 degC
acpitz7 at acpi0: critical temperature is 128 degC
"HPQ6001" at acpi0 not configured
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
acpicmos0 at acpi0
"PNP0A06" at acpi0 not configured
"SYN3003" at acpi0 not configured
"HPQ6007" at acpi0 not configured
acpibat0 at acpi0: BAT0 model "Primary" serial 45286 2014/10/10 type
LIon oem "Hewlett-Packard"
acpibat1 at acpi0: BAT1 not present
acpiac0 at acpi0: AC unit online
acpibtn0 at acpi0: SLPB
acpibtn1 at acpi0: LID_
"PNP0C14" at acpi0 not configured
tpm0 at acpi0: GTPM, can't find address
"INT33A0" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD01
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 1796 MHz: speeds: 2501, 2500, 2400, 2200, 2100,
1900, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 800, 775 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x0b
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x0b
drm0 at inteldrm0
inteldrm0: msi
azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x0b: msi
azalia0: No codecs found
xhci0 at pci0 dev 20 function 0 "Intel 8 Series xHCI" rev 0x04: msi,
xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev
3.00/1.00 addr 1
"Intel 8 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
em0 at pci0 dev 25 function 0 "Intel I218-LM" rev 0x04: msi, address
ec:b1:d7:94:7b:f3
azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi
azalia1: codecs: IDT/0x76e0
audio0 at azalia1
ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4
pci1 at ppb0 bus 1
ppb1 at pci0 dev 28 function 3 "Intel 8 Series PCIE" rev 0xe4: msi
pci2 at ppb1 bus 2
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7260" rev
0x73, msi
ppb2 at pci0 dev 28 function 5 "Intel 8 Series PCIE" rev 0xe4: msi
pci3 at ppb2 bus 3
rtsx0 at pci3 dev 0 function 0 "Realtek RTS5227 Card Reader" rev 0x01: msi
sdmmc0 at rtsx0: 4-bit, dma
ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 0 int 17
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev
2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 8 Series AHCI" rev 0x04: msi,
AHCI 1.3
ahci0: port 0: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, Samsung SSD 850, EMT0>
naa.5002538d40d7ae8d
sd0: 476940MB, 512 bytes/sector, 976773168 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic
0 int 18
iic0 at ichiic0
iic0: addr 0x2c 80=04 81=04 82=04 83=04 84=04 85=04 86=04 87=04 fd=01
words 00=ffff 01=ffff 02=ffff 03=ffff 04=ffff 05=ffff 06=ffff 07=ffff
spdmem0 at iic0 addr 0x50: 8GB DDR3 SDRAM PC3-12800 SO-DIMM
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
uhub2 at uhub0 port 3 configuration 1 interface 0 "SMSC USB2134B" rev
2.10/50.00 addr 2
uhidev0 at uhub2 port 4 configuration 1 interface 0 "Telink Wireless
Receiver" rev 1.10/1.00 addr 3
uhidev0: iclass 3/1, 5 report ids
ums0 at uhidev0 reportid 1: 5 buttons, Z dir
wsmouse1 at ums0 mux 0
uhid0 at uhidev0 reportid 3: input=4, output=0, feature=0
uhid1 at uhidev0 reportid 4: input=1, output=0, feature=0
uhid2 at uhidev0 reportid 5: input=0, output=0, feature=7
uhidev1 at uhub2 port 4 configuration 1 interface 1 "Telink Wireless
Receiver" rev 1.10/1.00 addr 3
uhidev1: iclass 3/1
ukbd0 at uhidev1: 8 variable keys, 6 key codes, country code 33
wskbd1 at ukbd0 mux 1
ugen0 at uhub0 port 5 "Validity Sensors product 0x003f" rev 1.10/1.04 addr 4
uvideo0 at uhub0 port 7 configuration 1 interface 0 "DDMDF029I7F45V HP
HD Webcam" rev 2.00/0.08 addr 5
video0 at uvideo0
uhub3 at uhub0 port 12 configuration 1 interface 0 "SMSC USB5534B" rev
3.00/50.00 addr 6
sdmmc0: can't enable card
uhub4 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching
Hub" rev 2.00/0.04 addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (12d950e117e78254.a) swap on sd0b dump on sd0b
inteldrm0: 1366x768, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wskbd1: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
iwm0: hw rev 0x140, fw ver 17.3216344376.0, address f8:16:54:1e:d9:80


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Re: inteldrm switches automatically to full brightness (100%)

Caspar Schutijser
On Sun, Feb 09, 2020 at 01:38:05AM +0100, volker wrote:

> Hi,
>
> I have an older HP Elitebook 840 G1. It is a system with FN key to change
> brightness: FN-F9 down, and FN-F10 up.
> btw: both keys don't work... (I was running an OpenSuSE 15 before, they
> worked to change brightness).
> So I installed OpenBSD ("current" for other reasons), and reduced the
> brightness at the restart of the machine, when it still displays the BIOS
> message or the OpenBSD boot prompt.
> The kernel would start normally, and display the blue messages. When the
> inteldrm driver loads, the screens gets shortly dark, and then comes back
> with the 4 blue lines of the inteldrm at the top, but now in full
> brightness.
> Everything else remains in full brightness, I start X automatically, and
> when logged in, I can't change the brightness anymore. Neither with the
> keys, nor with wsconsctl. It stays at 100%.
> I can use wsconsctl on the command line, it responds with a change, but
> actually brightness remains "full" (100%) - no changes:
>
> $ doas wsconsctl display.brightness=50
> display.brightness -> 50.00%
> $ doas wsconsctl display.brightness=10
> display.brightness -> 10.00%
>
> $ xbacklight
> 10.000000
> $ doas wsconsctl display.brightness=50
> display.brightness -> 50.00%
> $ xbacklight
> 50.000000

What happens when you set the brightness to 0? i.e.
$ doas wsconsctl display.brightness=0

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Re: inteldrm switches automatically to full brightness (100%)

Volker Nowarra-2
setting to 0 reduces actualy to minimum.

doas wsconsctl display.brightness=0
display.brightness -> 0.00%
$ xbacklight
0.000000

When I then try to "increase" a bit, it switches back to 100% brightness...
$ doas wsconsctl display.brightness=10
display.brightness -> 10.00%
$ xbacklight
10.000000
$ doas wsconsctl display.brightness=50
display.brightness -> 50.00%
$ xbacklight
50.000000


On 2020-02-09 10:05, Caspar Schutijser wrote:

> On Sun, Feb 09, 2020 at 01:38:05AM +0100, volker wrote:
>> Hi,
>>
>> I have an older HP Elitebook 840 G1. It is a system with FN key to change
>> brightness: FN-F9 down, and FN-F10 up.
>> btw: both keys don't work... (I was running an OpenSuSE 15 before, they
>> worked to change brightness).
>> So I installed OpenBSD ("current" for other reasons), and reduced the
>> brightness at the restart of the machine, when it still displays the BIOS
>> message or the OpenBSD boot prompt.
>> The kernel would start normally, and display the blue messages. When the
>> inteldrm driver loads, the screens gets shortly dark, and then comes back
>> with the 4 blue lines of the inteldrm at the top, but now in full
>> brightness.
>> Everything else remains in full brightness, I start X automatically, and
>> when logged in, I can't change the brightness anymore. Neither with the
>> keys, nor with wsconsctl. It stays at 100%.
>> I can use wsconsctl on the command line, it responds with a change, but
>> actually brightness remains "full" (100%) - no changes:
>>
>> $ doas wsconsctl display.brightness=50
>> display.brightness -> 50.00%
>> $ doas wsconsctl display.brightness=10
>> display.brightness -> 10.00%
>>
>> $ xbacklight
>> 10.000000
>> $ doas wsconsctl display.brightness=50
>> display.brightness -> 50.00%
>> $ xbacklight
>> 50.000000
> What happens when you set the brightness to 0? i.e.
> $ doas wsconsctl display.brightness=0
>

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Re: inteldrm switches automatically to full brightness (100%)

Caspar Schutijser
In reply to this post by Volker Nowarra-2
On Sun, Feb 09, 2020 at 01:38:05AM +0100, volker wrote:

> Hi,
>
> I have an older HP Elitebook 840 G1. It is a system with FN key to change
> brightness: FN-F9 down, and FN-F10 up.
> btw: both keys don't work... (I was running an OpenSuSE 15 before, they
> worked to change brightness).
> So I installed OpenBSD ("current" for other reasons), and reduced the
> brightness at the restart of the machine, when it still displays the BIOS
> message or the OpenBSD boot prompt.
> The kernel would start normally, and display the blue messages. When the
> inteldrm driver loads, the screens gets shortly dark, and then comes back
> with the 4 blue lines of the inteldrm at the top, but now in full
> brightness.
> Everything else remains in full brightness, I start X automatically, and
> when logged in, I can't change the brightness anymore. Neither with the
> keys, nor with wsconsctl. It stays at 100%.
> I can use wsconsctl on the command line, it responds with a change, but
> actually brightness remains "full" (100%) - no changes:
>
> $ doas wsconsctl display.brightness=50
> display.brightness -> 50.00%
> $ doas wsconsctl display.brightness=10
> display.brightness -> 10.00%
>
> $ xbacklight
> 10.000000
> $ doas wsconsctl display.brightness=50
> display.brightness -> 50.00%
> $ xbacklight
> 50.000000

Your email triggered me to look into this because I have a somewhat
comparable laptop on my desk (dmesg below) and it suffers from the same
problem. In the archives, I found a couple of things that could help:

1. Disable acpivideo(4) and/or acpivout(4) using UKC [1] [2].

2. Use jcs' intel_backlight_fbsd [3], see
https://github.com/jcs/intel_backlight_fbsd

Both approaches allow me to control the brightness of the screen. FWIW,
output of Linux running on this machine:
  $ ls /sys/class/backlight/
  intel_backlight

Best regards,
Caspar Schutijser


[1] https://marc.info/?l=openbsd-bugs&m=152699304722212&w=2
[2] https://marc.info/?l=openbsd-bugs&m=142787936328279&w=2
[3] https://marc.info/?l=openbsd-bugs&m=149583867702445&w=2


--

OpenBSD 6.6-current (GENERIC.MP) #628: Sat Feb  1 23:32:22 MST 2020
    [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 17036840960 (16247MB)
avail mem = 16508026880 (15743MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 3.0 @ 0xa9764000 (34 entries)
bios0: vendor HP version "P96 Ver. 01.27" date 04/18/2019
bios0: HP HP EliteBook 1040 G4
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP SSDT RTMA UEFI SSDT MSDM SLIC WSMT HPET APIC MCFG SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT DBGP DBG2 DMAR NHLT SSDT ASF! FPDT BGRT SSDT
acpi0: wakeup devices GLAN(S4) XHC_(S3) XDCI(S4) HDAS(S4) RP01(S4) PXSX(S4) TXHC(S3) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) PXSX(S4) RP05(S0) PXSX(S0) RP06(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 23999999 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz, 2595.15 MHz, 06-8e-09
cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,MD_CLEAR,TSXFA,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 24MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz, 2593.97 MHz, 06-8e-09
cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,MD_CLEAR,TSXFA,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 120 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf0000000, bus 0-127
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (RP01)
acpiprt2 at acpi0: bus -1 (RP02)
acpiprt3 at acpi0: bus -1 (RP03)
acpiprt4 at acpi0: bus -1 (RP04)
acpiprt5 at acpi0: bus 108 (RP05)
acpiprt6 at acpi0: bus -1 (RP06)
acpiprt7 at acpi0: bus -1 (RP07)
acpiprt8 at acpi0: bus -1 (RP08)
acpiprt9 at acpi0: bus 109 (RP09)
acpiprt10 at acpi0: bus -1 (RP10)
acpiprt11 at acpi0: bus -1 (RP11)
acpiprt12 at acpi0: bus -1 (RP12)
acpiprt13 at acpi0: bus -1 (RP13)
acpiprt14 at acpi0: bus -1 (RP14)
acpiprt15 at acpi0: bus -1 (RP15)
acpiprt16 at acpi0: bus -1 (RP16)
acpiprt17 at acpi0: bus -1 (RP17)
acpiprt18 at acpi0: bus -1 (RP18)
acpiprt19 at acpi0: bus -1 (RP19)
acpiprt20 at acpi0: bus -1 (RP20)
acpiprt21 at acpi0: bus -1 (RP21)
acpiprt22 at acpi0: bus -1 (RP22)
acpiprt23 at acpi0: bus -1 (RP23)
acpiprt24 at acpi0: bus -1 (RP24)
acpiec0 at acpi0
acpicpu0 at acpi0: C3(200@1034 mwait.1@0x60), C2(200@151 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@1034 mwait.1@0x60), C2(200@151 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: WRST
acpitz0 at acpi0: critical temperature is 128 degC
acpitz1 at acpi0: critical temperature is 128 degC
acpitz2 at acpi0: critical temperature is 128 degC
acpitz3 at acpi0: critical temperature is 128 degC
acpitz4 at acpi0: critical temperature is 128 degC
acpitz5 at acpi0acpitz5: CHGZ: failed to read _CRT
acpitz5: CHGZ: failed to read _CRT
: no critical temperature defined
acpitz6 at acpi0: critical temperature is 128 degC
acpitz7 at acpi0: critical temperature is 128 degC
acpitz8 at acpi0: critical temperature is 128 degC
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
"INT3403" at acpi0 not configured
"INT3403" at acpi0 not configured
acpicmos0 at acpi0
"ALP0113" at acpi0 not configured
"INT344B" at acpi0 not configured
"ALP0013" at acpi0 not configured
acpibat0 at acpi0: BAT0 model "Primary" serial 01525 2018/04/20 type LIon oem "Hewlett-Packard"
acpiac0 at acpi0: AC unit online
acpibtn0 at acpi0: SLPB
acpibtn1 at acpi0: LID_
acpibtn2 at acpi0: PWRB
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
"HPQ6001" at acpi0 not configured
"INT3400" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 2595 MHz: speeds: 2701, 2700, 2600, 2500, 2400, 2200, 2000, 1800, 1600, 1500, 1300, 1100, 800, 700, 600, 400 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 7G Host" rev 0x02
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 620" rev 0x02
drm0 at inteldrm0
inteldrm0: msi
"Intel Core 6G Thermal" rev 0x02 at pci0 dev 4 function 0 not configured
xhci0 at pci0 dev 20 function 0 "Intel 100 Series xHCI" rev 0x21: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
pchtemp0 at pci0 dev 20 function 2 "Intel 100 Series Thermal" rev 0x21
dwiic0 at pci0 dev 21 function 0 "Intel 100 Series I2C" rev 0x21: apic 2 int 16
iic0 at dwiic0
dwiic1 at pci0 dev 21 function 1 "Intel 100 Series I2C" rev 0x21: apic 2 int 17
iic1 at dwiic1
ihidev0 at iic1 addr 0x2c , can't establish interrupt (polling), vendor 0x44e product 0x120a, ALP0013
ihidev0: 12 report ids
imt0 at ihidev0: clickpad, 5 contacts
wsmouse0 at imt0 mux 0
"Intel 100 Series MEI" rev 0x21 at pci0 dev 22 function 0 not configured
ppb0 at pci0 dev 28 function 0 "Intel 100 Series PCIE" rev 0xf1: msi
pci1 at ppb0 bus 1
ppb1 at pci0 dev 28 function 4 "Intel 100 Series PCIE" rev 0xf1: msi
pci2 at ppb1 bus 108
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless-AC 8265" rev 0x78, msi
ppb2 at pci0 dev 29 function 0 "Intel 100 Series PCIE" rev 0xf1: msi
pci3 at ppb2 bus 109
nvme0 at pci3 dev 0 function 0 "Samsung SM981/PM981 NVMe" rev 0x00: msix, NVMe 1.2
nvme0: SAMSUNG MZVLB512HAJQ-000H1, firmware EXA72H1Q, serial S3WTNB0K561746
scsibus1 at nvme0: 2 targets, initiator 0
sd0 at scsibus1 targ 1 lun 0: <NVMe, SAMSUNG MZVLB512, EXA7>
sd0: 488386MB, 512 bytes/sector, 1000215216 sectors
pcib0 at pci0 dev 31 function 0 "Intel 200 Series LPC" rev 0x21
"Intel 100 Series PMC" rev 0x21 at pci0 dev 31 function 2 not configured
azalia0 at pci0 dev 31 function 3 "Intel 200 Series HD Audio" rev 0x21: msi
azalia0: codecs: Conexant/0x1fd6, Intel/0x280b, using Conexant/0x1fd6
audio0 at azalia0
ichiic0 at pci0 dev 31 function 4 "Intel 100 Series SMBus" rev 0x21: apic 2 int 16
iic2 at ichiic0
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
wsmouse1 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006>
sd1: 386047MB, 512 bytes/sector, 790625776 sectors
softraid0: volume sd1 is roaming, it used to be sd2, updating metadata
root on sd1a (2ec11a74f8a8cdcf.a) swap on sd1b dump on sd1b
inteldrm0: 1920x1080, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
iwm0: hw rev 0x230, fw ver 34.0.1, address xx:xx:xx:xx:xx:xx

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Re: inteldrm switches automatically to full brightness (100%)

Volker Nowarra-2
perfect!
I did a reboot, and gave it at the kernel prompt a "boot -c",
to enterinto UKC. It would allow to "find acpivideo", which
I disabled. Booting OpenBSD66 into xenodem will go with
full brightness, but once in a terminal window I can do:

$ doas wsconsctl display.brightness=6  
display.brightness -> 5.97%
$ doas wsconsctl display.brightness=27
display.brightness -> 26.89%
$ doas wsconsctl display.brightness=75  
display.brightness -> 74.91%

and the screen now adapts brightness as desired.

thx so much,
Volker

On Sun, Feb 09, 2020 at 01:44:54PM +0100, Caspar Schutijser wrote:

>
> Your email triggered me to look into this because I have a somewhat
> comparable laptop on my desk (dmesg below) and it suffers from the same
> problem. In the archives, I found a couple of things that could help:
>
> 1. Disable acpivideo(4) and/or acpivout(4) using UKC [1] [2].
>
> 2. Use jcs' intel_backlight_fbsd [3], see
> https://github.com/jcs/intel_backlight_fbsd
>
> Both approaches allow me to control the brightness of the screen. FWIW,
> output of Linux running on this machine:
>   $ ls /sys/class/backlight/
>   intel_backlight
>
> Best regards,
> Caspar Schutijser
>
>
> [1] https://marc.info/?l=openbsd-bugs&m=152699304722212&w=2
> [2] https://marc.info/?l=openbsd-bugs&m=142787936328279&w=2
> [3] https://marc.info/?l=openbsd-bugs&m=149583867702445&w=2
>
>
>