I have the same output when booting Ubuntu, PCI: BIOS BUG #81[49435000]
FOUND.

Don't know if it's related, but I also had some problems with sound. On
a clean install the sound works fine, but after the system update the
ALSA driver stopped working, and only the OSS driver provided sound.
This happened for 32 bit Edgy, 64 bit Feisty and also 32 Feisty.

Using this guide
https://help.ubuntu.com/community/HdaIntelSoundHowto?highlight=%28hda%29
I managed to install ALSA 1.0.14 and now the driver is functional once
again, although I didn't managed to record anything using my mic (it
worked before).

Sometimes, some updated messes with my driver and I must redo the steps
from the guide to install it again.

-- 
PCI & hda_intel errors during boot
https://bugs.launchpad.net/bugs/69022
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