Bug 11003 - brightness control - ASUS A7K
brightness control - ASUS A7K
Product: ACPI
Classification: Unclassified
Component: Other
All Linux
: P1 normal
Assigned To: Zhang Rui
Depends on:
  Show dependency treegraph
Reported: 2008-06-29 03:23 UTC by Jonathan Dray
Modified: 2008-07-11 01:20 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.26-rc8
Tree: Mainline
Regression: Yes


Description Jonathan Dray 2008-06-29 03:23:42 UTC
Latest working kernel version:2.6.24
Earliest failing kernel version:
Distribution:Debian Testing
Hardware Environment:ASUS A7K Laptop
Software Environment:
Problem Description:
After the screen brightness has been reduced using keyboard fn+F5 key combinaison, the brightness goes up alone automatically to the maximum level (ouch !) 

Steps to reproduce:Lower the brightness using the keyboard.
Comment 1 ykzhao 2008-06-29 19:07:42 UTC
Will you please attach the output of acpidump?

There are two platform drivers for asus laptop : drivers/acpi/asus-acpi and drivers/misc/asus-laptop. Will you please use the drivers/misc/asus-laptop instead of drivers/acpi/asus-acpi and see whether the problem still exists?

Comment 2 Zhang Rui 2008-06-30 00:54:09 UTC
1. kill acpid
2. cat /proc/acpi/events
3, attach the output of you press the hotkey for several times.

Comment 3 Jonathan Dray 2008-07-01 15:26:22 UTC
I'm afraid I won't be able to send you any additional information.
My laptop is dead :(
It worked only 10 days !!!!
I hope someone with similiar hardware configuration will be able to continue diagnose and report these issues.

Jonathan Dray
Comment 4 ykzhao 2008-07-03 00:48:13 UTC
Hi, Jonathan
   From the dmesg in http://bugzilla.kernel.org/show_bug.cgi?id=11004#c8 it seems that the drivers/acpi/asus-acpi is used. 
   Please use the platform driver of drivers/misc/asus-laptop.c and see whether the problem still exists?
Comment 5 Zhang Rui 2008-07-06 19:52:18 UTC
sorry to hear that.
I'll reject this bug as it's UNREPRODUCIBLE.
Please reopen it and it works again someday. :)
Comment 6 Jonathan Dray 2008-07-11 01:20:03 UTC
Hi, Zhang

I got my laptop up and running again. 
It was a hardware issue with the battery that is now resolved.
I reinstalled linux with a complete 64bits environnement : kernel and userspace.
Then I moved to a 2.6.26-rc8 kernel and blacklisted the asus-acpi driver so that asus_laptop module get loaded at init time.

Setting the backlight now perfectly works and the settings are kept after a reboot.

The kernel version is the same. I suppose it was a asus-acpi or a software issue.

Thanks for your help

Note You need to log in before you can comment on or make changes to this bug.