Red Hat Bugzilla – Bug 747390
Brightnes keys have no effect on Asus UL20A
Last modified: 2013-11-09 14:02:25 EST
Description of problem:
Pressing the Fn-F4 and Fn-F5 during GNOME3.2 sessions ;ldoes not change brightness. When I press it, I see the translucent notification and it changes the slider. However no effect - subsequent press will somehow delay the notification even up to 1 minute after the press.
Version-Release number of selected component (if applicable):
I've uploaded Smolt profile at http://www.smolts.org/client/show/pub_7f6f1686-d91a-4398-86fc-b40e4164afc2
Boot into gnome and pres Fn-F4
Steps to Reproduce:
1. Boot and login
2. Press Fn key for decrease/increase
Only notification, no action.
Brightness is changed. I actually expects the brightness is handled automatically.
[root@laptop ~]# ls -l /sys/class/backlight/
lrwxrwxrwx. 1 root root 0 Oct 19 17:18 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
lrwxrwxrwx. 1 root root 0 Oct 19 17:18 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight
I would like to know what component is resposible for what and how I can help, Ican do some logs no problem.
Created attachment 529571 [details]
Today I've noticed there are some messags about ACPI errors, perhaps it helps
I've modified the kernel boot to acpi_backlight=vendor, now the keys works. But once the screen is locked (inactivity), the screen is now without any backlight. I have to type my password blindly and then pres the brighntess keys to make it work. Any hints?
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This bug is reproducible on F19