Red Hat Bugzilla – Bug 361051
184.108.40.206-42.fc8/snd_hda_intel sound volume drift
Last modified: 2007-11-30 17:12:20 EST
Description of problem:
When the Master volume is set to less than 100%, it start slowly drifting (time
scale 10-20s) back to 100% and the volume increases. The volume control applet
setting remains unchanged. When the volume applet widget is just touched, the
volume is reset back to the original value. "PCM" and "Front" settings do not drift.
Version-Release number of selected component (if applicable):
Always. This must be some recent problem because it did not happen few days ago
and I track the updates closely every 1-3 days.
What was the version of the previous kernel that worked?
I see now it must have happen earlier: kernel-220.127.116.11-37.fc8 drifts as well.
kernel-2.6.23-0.214.rc8.git2.fc8 does NOT drift. I have to find now some kernels
Please run the soundcard detection utility and go to the third tab and generate
a report, then attach it to this bugzilla.
18.104.22.168-35.fc8 is ok, 22.214.171.124-36.fc8 isn't. I note that the latter presents a
"Master" Volume control widget while the former does not.
Created attachment 244991 [details]
scsconfig.log created with 126.96.36.199-42.fc8
Please take a look at
And also at
We are discussing a similar bug there.
Looks like an identical bug to me.
*** This bug has been marked as a duplicate of 354981 ***
Since your report is a bit different, I want to suggest you to start
alsamixer in console using this command:
alsamixer -D hw:0
and change master volume here.
Does this work?
alsamixer -D hw:0 behaves identically as gnome-volume-control: when the master
volume is reduced, the actual volume starts drifting up, but the position of the
control widget in alsa-mixer remains unchanged. Pressing <Up> or <Down> key
resets the actual volume to the level visualized by alsamixer - and then it
starts drifting again... Also as with g-v-c, values set for PCM and Front
channels stay fixed, no drift is observed.
It is probably hardware bug.
All I do is I set hardware control 'VolumeKnob'
probably it is broken on your stac
(Probably all STAC9205s have this bug, since windows driver doesn't
use it, and linux drivers wasn't using it till I added support for it)
I wait and see whenever I get more bug reports.
Meanwhile just ignore the 'Master' control. and use 'Front'
instead like you did before.
Also you can use 'PCM' to lower the volume in software.
Thanks for tracking this down. Now, I need to figure out how to change the
binding in gnome-keybinding-properties of "Volume Up" action from controlling
the Master Volume to controlling the Front or PCM volumes. (but this is out of
the scope for this bug).
I can revert the commit that added the support for that control; we can see if
It will 100% help, but I don't yet know whenever the VolumeKnob is broken on
very few systems, or it is broken on all STAC9205 or maybe even in all
Pawel Salek, can you give me contents of /proc/asound/Intel/codec*
I want to know what STAC codec exactly you have to track down what codecs
don't have good VolumeKnob
Created attachment 248861 [details]
Contents of /proc/asound/Intel/codec#
Contents attached. There are two codecs available. #0 is SigmaTel STAC9205
(audio?), #1 is Conexant ID 2c06 (modem?)
Thank you very much.
The Conexant ID 2c06 is modem, and it is unrelated.
You have the same STAC9205 as in 354981.