I run Feisty on a T42.
I have the problem as diagnosed here:

resume_from_disk => no sound
resume_from_RAM => sound
restart => no change (if I had (no)sound before I would have (no)sound after)

and as AndrĂ© RĂ¼diger described: 
>When I plug in/out the AC the computer does a beep.
>While the beep is played (ca 1 sec) the sound works.

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.

And thank you all for great input and the fix of course.

-- 
[Feisty] Inaudible audio upon resuming from suspend-to-disk
https://bugs.launchpad.net/bugs/80893
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