Kernel Bug Tracker – Bug 28762
Hotkey[Fn+F5/F6] can't adjust brightness
Last modified: 2012-05-24 07:52:53 UTC
Created attachment 47102 [details]
22.214.171.124 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
May somebody tell me how to research kernel ACPI subsystem codes?
*** Bug 28752 has been marked as a duplicate of this bug. ***
I suppose the bug still exists in the latest upstream kernel, right?
Please attach the acpidump output of this laptop.
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.