Red Hat Bugzilla – Bug 595885
Brightness management is buggy on ASUS UL30
Last modified: 2012-12-13 14:11:28 EST
Description of problem:
When I try to set the screen brightness (using keyboard or using power management), the system seems set a "random" brightness after about ~30 seconds.
Version-Release number of selected component (if applicable):
Fedora 13 x86
Try to set brightness on ASUS UL series.
Steps to Reproduce:
1. Try to set brightness on ASUS UL series.
You can't manage it.
Set the screen brightness correctly.
I got the same problem on my laptop Asus UL20A with 64 bit Fedora 13.
It seems bit strange like: i use Fn+F5 which should turn down the brigntness, it actually is under win7 and even before system boot up (in Asus laptop start up screen, which is an Asus logo in the middle of the screen). but when 64-bit Fedora 13 bootup, it is still keep the brightness settings until when gnome or KDE fully loaded.
To be clearer, i set the brightness to 10% under win7, it is keeping 10% from laptop switching on to F13 log in screen. When I logged in, and the gnome or KDE are fully loaded, the brightness would be back to 100% automatically.
I found this bug is going cross almost all different kinds of laptops (recent models). I hope it can be solved soon cuz i can bear 100% brightness, that kills my eyes.
I am affected by this issue as well, on Asus U30Vt and Fedora 13 64 bit. Brightness cannot be changed. Supposedly, this workaround make it work:
This message is a reminder that Fedora 13 is nearing its end of life.
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This bug persists in F17.
This bug persists in F18...
I fixed using acpi_backlight=vendor on my ASUS UL30A
It works also with setpci -s 00:02.0 F4.B=2a # where 2a is an hex number between 00 and ff
Created attachment 660495 [details]
dmesg from 3.7.0rc8 (F18+rawhide kernel)
Kernel 3.7.0rc8 (from rawhide), Fedora 18 (up to date), KDE, latest BIOS installed, acpi_backlight=vendor used, stil having minor problems: little hangup when kde starts.
I've tried the latest testing kernel because of this: https://bugs.freedesktop.org/show_bug.cgi?id=45452