Binary package hint: linux-generic
The intel-hda driver appears to have significant issues in both Dapper and Edgy. To be more specific, this is a good description of what I'm experiencing (taken from the thread here (http://www.ussg.iu.edu/hypermail/linux/kernel/0609.3/0467.html)):
"I have a ThinkPad X60 which uses the Intel 82801G HDA audio chip. This used to work for me, but lately (sometime during 2.6.18-rcX series) it stopped working - programs trying to use it tend to just block forever waiting for /dev/dsp.
The only obvious symptom is:
hda_intel: azx_get_response timeout, switching to single_cmd mode...
appearing in the kernel log when booting."
It's particularly bad post-suspend, but occurs intermittently otherwise. I'm also on an X60s. See confirmation from another Ubuntu user here (http://www.ubuntuforums.org/showthread.php?t=156146&highlight=hda_intel%3A+azx_get_response).
The majority of the issues causing said symptom have been fixed in alsa-kernel hg. Patches were available in early October and have been backported to both Dapper and Edgy linux-source (see the October '06 Ubuntu kernel-team list archives) but have yet to be merged (note that some said patches are invasive and questionable for an LTS release).
Two additional points:
1) Make sure you're running the latest BIOS;
2) Try compiling alsa-driver 1.0.13 from upstream alsa-project.org.