On IBM Thinkpad T40 series, the Headphone Jack and/or Line Jack inputs need to be muted in order to hear sound at all.

There were a few bugs the past days about missing sound. Just by chance:
Can you enable sound again by setting PCM in "alsamixer -Dhw" to 100 or so?

I have already tried to set PCM to 100 but sound is still quiet.

On Mon, Dec 1, 2008 at 1:32 PM, bugmenot <email address hidden> wrote:

> There were a few bugs the past days about missing sound. Just by chance:
> Can you enable sound again by setting PCM in "alsamixer -Dhw" to 100 or so?
>
> --
> very quiet sound on notebook IBM r40e
> https://bugs.launchpad.net/bugs/303789
> You received this bug notification because you are a direct subscriber
> of the bug.
>

Sorry, then this seems like another bug. Are you also sure that all channels are unmuted? (MM under a channel stands for muted I think).

You could also try a "alsactl restore". If that does not work either then I have really no idea any more.

really I try to set all channels are unmuted and muted or half muted but I have this same result. on this model IBM r40e I have very many bugs :(
1. Functional key's not work
2. Hardware key's not work
3. Sounds very quiet
4. I can't return computer to live after mode "sleep" (I already tried all key's)

Thank to http://www.thinkwiki.org/wiki/ThinkWiki! I solve this problem!

Solution:

sudo bash
echo level 15 >/proc/acpi/ibm/volume

And this (http://www.thinkwiki.org/wiki/AD1981B) notes:

Note 1

On some models (T40, T43p, ... R51e ...) audio is muted if either Headphone or Line Jack are unmuted. See also ALSA Wiki FAQ [1]. Also, if Headphone Sense or Line Jack Sense are unmuted audio is dead (R52, X40). By default the Sense settings are not shown in GNOME.

Note 2

A bug was introduced in the 2.6.20 kernel (between the rc1 and rc2 releases) which causes the sound to stop working after hibernation. Rebooting does not seem to fix the problem. A quick work-around is to do a suspend-to-ram, and then wake the machine up. This issue is chronicled in this bug report on Launchpad.net: The fix changing HIBERNATE_MODE=shutdown to HIBERNATE_MODE=platform in /etc/default/acpi-support worked very well. I don't know if it possibly could introduce other bugs or if it's a true fix.

https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/80893

Hi Sailorman,

Please, if you are still having issues, test with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p alsa-base 303789

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds .

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

Please let us know your results.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

There is a possible fix for this problem in the newly released 2.6.34-rc3 linux kernel. From the changelog:

Daniel T Chen (3):
      ALSA: ac97: Add IBM ThinkPad R40e to Headphone/Line Jack Sense blacklist

There should soon be a PPA of this kernel RC available at http://kernel.ubuntu.com/~kernel-ppa/mainline/

The abovementioned patch has been included in kernel 2.6.32.11 upstream.

Upstream kernel 2.6.32.11 (and hence the abovementioned patch) has been included Ubuntu kernel 2.6.32-20.29.