Thinkpads Forum

Problem:

Sound doesn't work after waking from hibernation. I've seen this problem described on the Ubuntu forums for many different brands of laptops that use the Intel ICH6 sound device. Several suggested fixes were offered but none work on my ThinkPad.

Observations:

1. Sound works perfectly when booted from the 7.04 Live CD
2. To restore sound from an installed version of K/Ubuntu, it is necessary to shut down completely (power off) and then restart. Simply rebooting without powering down does not fix sound.
3. Running sudo/etc/init.d/alsa-utils restart does not fix the sound when broken.
4. Suspending to disk and then waking does restore sound.

I'm fairly sure that alsasound is running, the mixer device is running, and the volume up/down buttons on the Thinkpad seem to work, but something is disabled at a very low level.

Any suggestions?

from the fact that restarting doesn't help, I am going to recommend you try updating the bios.
Is there a way to try the sound from a liveCD? If it does the same thing it's hard/firmware problems most likely. That's a very strange problem.

Thanks, truk. I am using the latest BIOS. The live CD works perfectly.

It is a really strange problem, but well documented on the Ubuntu forum. Lots of other people are able to reproduce it, so I'm not alone. One user with an X41T responded to my post to say that he gave up and did a clean install of 7.04 and that fixed it. I did an upgrade install.

One further observation -- if I run all of the scripts that run when resuming from standby the sound does not come back on. Actually going into standby and then resuming does work. Comparing to observation 2) in my first post, that's consistent with the need to cycle power off then on to restore sound.

fix: https://bugs.launchpad.net/ubuntu/+sour ... omments/27

I had the same problem yesterday after "upgrading" the kernel .

ryan:

Perfect! That did the trick. I've been trying to fix that for a month now. Thanks for responding.

I just fixed my problem by doing this

go to /etc/default/acpi-support

change the HIBERNATE_MODE=platform instead of =shutdown