Bug 28762 - Hotkey[Fn+F5/F6] can't adjust brightness
Hotkey[Fn+F5/F6] can't adjust brightness
Product: ACPI
Classification: Unclassified
Component: Power-Video
All Linux
: P1 normal
Assigned To: acpi_power-video
: 28752 (view as bug list)
Depends on:
  Show dependency treegraph
Reported: 2011-02-10 10:04 UTC by reinhart
Modified: 2012-05-24 07:52 UTC (History)
2 users (show)

See Also:
Kernel Version:
Tree: Mainline
Regression: No

Attachments kernel configuration (68.98 KB, application/octet-stream)
2011-02-10 10:04 UTC, reinhart

Description reinhart 2011-02-10 10:04:42 UTC
Created attachment 47102 [details] kernel configuration

I encounter a problem that the brightness can't be adjusted when I press Fn+F5/F6 (brightness up/down) in Asus K52J machine.
I debug this problem when I change kernel command line options (acpi_backlight and acpi_display_output) from "vendor" to "video", and this problem is fixed.
I don't know whether the backlight device module (asus-laptop) causes this problem, but the same asus-laptop module don't occur this problem in Asus K42JR machine.
I hope that I can understand the reason of this problem.

Thank you for your help.

PS: In K52J machine : Fn+F5/F6 can work when enter BIOS setup window
PS2: In K42JR machine : Fn+F5/F6 can't work when enter BIOS setup window
Comment 1 reinhart 2011-02-10 10:21:57 UTC
May somebody tell me how to research kernel ACPI subsystem codes?
Comment 2 Zhang Rui 2011-02-15 01:30:05 UTC
*** Bug 28752 has been marked as a duplicate of this bug. ***
Comment 3 Zhang Rui 2012-01-18 03:12:23 UTC
I suppose the bug still exists in the latest upstream kernel, right?
Please attach the acpidump output of this laptop.
Comment 4 Zhang Rui 2012-05-24 07:52:53 UTC
bug closed as there is no response from the bug reporter.
please feel free to reopen it if the problem still exists in the latest upstream kernel.

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