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
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
Randomly modified brightness and sound level
Properly modified brightness and sound level
It still doesn't work in F8
It shall be related to kernel in kernel
it works (not fine: the brightness keys works, the volume keys are broken)
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
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:
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 ***