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Serg346
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Elitebook 850 G6: Brightness buttons do not work on Linux

HP Recommended
Elitebook 850 G6
Linux

When I press any of brightness button just nothing happens (not even popped up brightness indicator). Brightness set to 100% by default and doesn't change. I tried to google this problem and it seems nothing works. But I have to note the brightness buttons work on Windows and most of others Fn buttons work in both systems.

 

I tried to play with acpi_backlight and acpi_osi kernel parameters settings various values like vendor/video for acpi_backlight and empty acpi_osi.

And tried to update kernel to the latest available (5.9.0rc1)

It didn't help.

 

 

 

I guess the buttons may not work because broken ACPI tables in the latest R70(1.5.3) BIOS. But I don't really know what does it affect.

 

Some related logs:

[ 0.460538] ACPI: \_SB_.PR00: _OSC native thermal LVT Acked
[ 0.461733] ACPI BIOS Error (bug): AE_AML_BUFFER_LIMIT, Field [CAP1] at bit offset/length 64/32 exceeds size of target Buffer (64 bits) (20200717/dsopcode-198)
[ 0.461748] fbcon: Taking over console
[ 0.461758] No Local Variables are initialized for Method [_OSC]
[ 0.461760] Initialized Arguments for Method [_OSC]: (4 arguments defined for method invocation)
[ 0.461760] Arg0: 00000000f49d45db <Obj> Buffer(16) 6E B0 11 08 27 4A F9 44
[ 0.461768] Arg1: 0000000035c1bda1 <Obj> Integer 0000000000000001
[ 0.461770] Arg2: 00000000f987fdb6 <Obj> Integer 0000000000000002
[ 0.461773] Arg3: 00000000b6338856 <Obj> Buffer(8) 01 00 00 00 FF 10 00 00
[ 0.461779] ACPI Error: Aborting method \_SB._OSC due to previous error (AE_AML_BUFFER_LIMIT) (20200717/psparse-529)

...

[ 1.006853] ACPI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x000000005) is beyond end of object (length 0x5) (20200717/exoparg2-393)
[ 1.006933]
Initialized Local Variables for Method [GETP]:
[ 1.006934] Local0: 00000000648c9103 <Obj> Integer 0000000000000003
[ 1.006939] Initialized Arguments for Method [GETP]: (2 arguments defined for method invocation)
[ 1.006940] Arg0: 00000000fd6e190e <Obj> Integer 0000000000000005
[ 1.006943] Arg1: 00000000fde0c06c <Obj> Integer 0000000000000003
[ 1.006948] ACPI Error: Aborting method \_TZ.GETP due to previous error (AE_AML_PACKAGE_LIMIT) (20200717/psparse-529)
[ 1.007012] ACPI Error: Aborting method \_TZ.CHGZ._CRT due to previous error (AE_AML_PACKAGE_LIMIT) (20200717/psparse-529)
[ 1.008535] ACPI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x000000005) is beyond end of object (length 0x5) (20200717/exoparg2-393)
[ 1.008615]
Initialized Local Variables for Method [GETP]:
[ 1.008616] Local0: 00000000607a4a9a <Obj> Integer 0000000000000003
[ 1.008620] Initialized Arguments for Method [GETP]: (2 arguments defined for method invocation)
[ 1.008621] Arg0: 0000000073e523a3 <Obj> Integer 0000000000000005
[ 1.008624] Arg1: 00000000405cac73 <Obj> Integer 0000000000000003
[ 1.008629] ACPI Error: Aborting method \_TZ.GETP due to previous error (AE_AML_PACKAGE_LIMIT) (20200717/psparse-529)
[ 1.008692] ACPI Error: Aborting method \_TZ.CHGZ._CRT due to previous error (AE_AML_PACKAGE_LIMIT) (20200717/psparse-529)
[ 1.008762] [Firmware Bug]: No valid trip found

 

Kubuntu 20.04.1

 

Is there any workaround for the buttons?

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