Comment 21 for bug 1038479

I have the same problem (Lenovo X201T, Ubuntu 12.04.3 64Bit).
With Ubuntu 11.10 Live-CD the sound works and also after the first installaion.
The soundproblem occure after some Updates in Ubutu 11.10. I believe after Ubuntu 12.04 was released.
I think its no harwareproblem, in windows the speakers worked very well bevor i migrate to Ubuntu.

- Speakers work for approx. 6 or 7 mins..
- Restart will fix the issue, but sound always quits from internal speaker.
- Headphones work always.
- If I "suspend" my system my sound is back on return.
- If I "log out" my system my sound is back on return.
- Volume also seems to be a factor.
- Speakers going are disabled only when making noise, not in phases of silence.
- I also suspected it is promoted by overdriven sounds.

- I tried in /etc/modeprobe.d/alsa-base.conf -> (dosn't work):
# (MB)Keep snd-pcsp from beeing loaded as first soundcard
options snd-pcsp index=-2
alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=thinkpad (dosn't work)
then
options snd-hda-intel model=generic (dosn't work)
and
options snd-hda-intel model=lenovo (dosn't work)

- I tried also (https://wiki.ubuntu.com/Audio/PositionReporting) -> (dosn't work):
Turning off PulseAudio timer scheduling:
If your problem is specific to PulseAudio, you could as a last resort, try to turn off PulseAudio's timer scheduling. Note that this might consume slightly more power.

To change this, edit the file /etc/pulse/default.pa and change the line that says:
  load-module module-udev-detect
to
  load-module module-udev-detect tsched=0
After editing the file, reboot your computer for changes to take effect.

Any Solutions?