Confirming on Thinkpad T42 with Feisty Fawn (fresh install) and
2.6.20-15-386: No sound after hibernation or warm restart. Strangely,
the sound works (e.g. in amarok) for less than a second when I un-/in-
plug AC adapter. Cold restart fixes the sound. This was not an issue
under Dapper.

After hibernation "everything" looks normal except:
Output of $more dmesg | grep 1f.5
[ 1948.480000] Intel ICH 0000:00:1f.5: freeze
[ 1948.480000] ACPI: PCI interrupt for device 0000:00:1f.5 disabled
[ 1948.500000] Intel ICH 0000:00:1f.5: LATE freeze
[ 2057.500000] Intel ICH 0000:00:1f.5: EARLY resume
[ 2057.540000] Intel ICH 0000:00:1f.5: resuming
[ 2057.540000] PM: Writing back config space on device 0000:00:1f.5 at offset 1 
(was 2900007, writing 2900003)
[ 2057.540000] ACPI: PCI Interrupt 0000:00:1f.5[B] -> Link [LNKB] -> GSI 11 
(level, low) -> IRQ 11
[ 2057.540000] PCI: Setting latency timer of device 0000:00:1f.5 to 64

Output of $lspci -vv | grep "AC'97"
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM 
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
00:1f.6 Modem: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 
Modem Controller (rev 01) (prog-if 00 [Generic])

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