Dapper: recent upgrade caused loss of sound on IBM Thinkpad T21

Thank you for your bug report.

chombee:

Can you attach (using the Add Attachment link at the left of the launchpad website) as a text file the output of the command
lspci
along with the out of the command
dmesg

Setting to needsinfo pending reply from chombee

This is the output of dmesg on the culprit IBM Thinkpad T21

This is the output of lspci on the culprit IBM Thinkpad T21

There's a utility called:

  speaker-test

do you get any results from running it? Could you alsa attach the output from:

  amixer info

Also, could you try running:

  alsamixer

and seeing if there are any "Jack Sense" channels where you can toggle the mute channel.

Finally, the ThinkPad has both hardware and software mixer channels (and mute toggles!). Is the hardware mixer un-muted (try pressing the Volume Up buttons severals times).

speaker-test gave no audio output, it did output some text (which I can't cut and paste right now as the laptop is not connected).

Strangely, I finally came to a setting labelled 'DAC' in alsamixer which was set to 0, I turned it up and my sound returned! Appears to be working
fine now although I don't want to test it too much as I'm in my office. Strange that it got mis-set somehow, I don't think I did that.

On Wed, May 17, 2006 at 08:05:19PM -0000, Paul Sladen wrote:
> There's a utility called:
>
> speaker-test
>
> do you get any results from running it? Could you alsa attach the
> output from:
>
> amixer info
>
> Also, could you try running:
>
> alsamixer
>
> and seeing if there are any "Jack Sense" channels where you can toggle
> the mute channel.
>
> Finally, the ThinkPad has both hardware and software mixer channels (and
> mute toggles!). Is the hardware mixer un-muted (try pressing the Volume
> Up buttons severals times).
>
> ** Changed in: Ubuntu
> Sourcepackagename: None => alsa-utils
>
> --
> Dapper: recent upgrade caused loss of sound on IBM Thinkpad T21
> https://launchpad.net/bugs/45246
>

--
<email address hidden>
SDF Public Access UNIX System - http://sdf.lonestar.org

When you can next get to the laptop, can you attach the ouput from each of:

  lspci -vn

  amixer info

  amixer | grep -iA5 DAC

it maybe that we need to code the 'DAC' volume to be a fixed value.

Adding the requested outputs

Adding the requested outputs

Adding the requested outputs

I had the same problem after upgrading Breezy to Dapper RC, but not on a ThinkPad--instead on a frankenbuild Athlon XP 2200+ desktop. In my case, in alsamixer there were four identical entries labeled VIA DXS all the way to the right of the mixer console. These were all turned down to zero. I turned them up to 81 and then I got sound from speaker-test, KDE, etc.

amixer info:
Card default 'V8235'/'VIA 8235 with ALC101 at 0xe800, irq 201'
  Mixer name : 'Realtek ALC101'
  Components : 'AC97a:414c4730'
  Controls : 30
  Simple ctrls : 23

Attaching lspci -vn output

[Expired for alsa-utils (Ubuntu) because there has been no activity for 60 days.]