Bug 359951 - Brightness/Volume control doesn't work on T61
Brightness/Volume control doesn't work on T61
Status: CLOSED DUPLICATE of bug 363261
Product: Fedora
Classification: Fedora
Component: gnome-session (Show other bugs)
All Linux
low Severity low
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Assigned To: David Zeuthen
Fedora Extras Quality Assurance
: Reopened
Depends On:
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Reported: 2007-10-31 07:13 EDT by Zdenek Kabelac
Modified: 2013-03-05 22:53 EST (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-07-24 00:17:34 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Zdenek Kabelac 2007-10-31 07:13:59 EDT
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
Actual results:
Randomly modified brightness and sound level 

Expected results:
Properly modified brightness and sound level

Additional info:
Comment 1 Feng Yu 2008-03-11 16:04:56 EDT
It still doesn't work in F8 
Comment 2 Feng Yu 2008-03-11 16:47:32 EDT
It shall be related to kernel in kernel 


it works (not fine: the brightness keys works, the volume keys are broken)

it stops working.
Comment 3 Feng Yu 2008-03-11 17:44:52 EDT
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.

Comment 4 Feng Yu 2008-03-11 17:51:32 EDT
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

Comment 5 Feng Yu 2008-03-13 03:58:16 EDT
no gnome-power-manager still randomly controls either the build-in soundcard or
the external sound card.
Comment 6 Richard Hughes 2008-04-30 05:10:44 EDT
gnome-power-manager doesn't do anything with the volume keys.
Comment 7 Richard Hughes 2008-04-30 05:44:40 EDT
Taking a guess at the component.
Comment 8 Bug Zapper 2008-05-13 23:48:36 EDT
Changing version to '9' as part of upcoming Fedora 9 GA.
More information and reason for this action is here:
Comment 9 Zdenek Kabelac 2008-06-06 04:42:33 EDT
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)
Comment 10 petrosyan 2008-07-24 00:17:34 EDT

*** This bug has been marked as a duplicate of 363261 ***

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