Red Hat Bugzilla – Bug 359951
Brightness/Volume control doesn't work on T61
Last modified: 2013-03-05 22:53:33 EST
Description of problem: Brightness setting doesn't work at all on my T61 While I have no problem to use echo level 0-7 >/proc/acpi/ibm/brightness setting via keyboard Fn usually leads to unpredictable behavior. Also the buttons for sound volume/mute doens't work properly - mute does something - but up/down volume does not. Version-Release number of selected component (if applicable): Power Manager Brightness Applet 2.20.0 How reproducible: Running on Levovo T61 - whenver I use Fn+Home/End (up/down brightness) I could see the brightness picture window which changes the brightness value in its bar - but no actual brightness change could be visible. Then sometime suddenly after something like 5 minutes the brightness get changed somehow. Also the brightness applet 2.20.0 does slightly better job - moving it really cause to change the brightness - but this applet seems to be unable to properly detect current level of brightness. Steps to Reproduce: 1. Use Lenovo T61 and latest Fedora Devel 2. Try to use Fn keys for brightness / sound 3. Actual results: Randomly modified brightness and sound level Expected results: Properly modified brightness and sound level Additional info:
It still doesn't work in F8 hal-info-20071030-1.fc8 gnome-power-manager-2.20.0-6.fc8
It shall be related to kernel in kernel kernel-2.6.23.1-42.fc8 it works (not fine: the brightness keys works, the volume keys are broken) in kernel-2.6.24.3-12.fc8 it stops working.
It is the kernel module video causes this. by blacklisting 'video' and forcing 'thinkpad-acpi' to control the brightness, the brightness setting in gnome-powermanager works, but the thinkpad Fn-keys for brightness stops working. the volume controlling issue is caused by gnome-powermanager tries to modify the volume of my external soundcard. By disabling the keys in System->Shortcuts it becomes fine.
No the volume fix should be in /etc/modprobe.conf alias snd-card-0 snd-hda-intel alias snd-card-1 snd-usb-audio options snd cards_limit=3 options snd-card-0 index=0 options snd-hda-intel index=0 power_save=5 options snd-usb-audio index=1 options snd-card=1 index=1 options thinkpad-acpi brightness_enable=1 hotkey_report_mode=2
no gnome-power-manager still randomly controls either the build-in soundcard or the external sound card.
gnome-power-manager doesn't do anything with the volume keys.
Taking a guess at the component.
Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
This bug could be closed - it loosk like recent version these applets operates properly (except for the weird behaviour of PCM volume control, where the snd-hda device doesn't work correctly on recent kernels)
*** This bug has been marked as a duplicate of 363261 ***