whilst investigating hotkeys not working on my laptop I found the
following:

sudo depmod -a gave me a list of kernel objects that "were not elf objects"
/lib/modules/2.6.28-11-generic/kernel/sound/pci/ac97/snd-ac97-codec.ko
/lib/modules/2.6.28-11-generic/kernel/sound/pci/ali5451/snd-ali5451.ko
/lib/modules/2.6.28-11-generic/kernel/sound/pci/au88x0/snd-au8810.ko
/lib/modules/2.6.28-11-generic/kernel/sound/pci/au88x0/snd-au8820.ko
/lib/modules/2.6.28-11-generic/kernel/sound/pci/au88x0/snd-au8830.ko

using synaptic I downloaded the 2.7.28-11 source and did the following
sudo make oldconfig
sudo make

I then moved the newly built objects into their correct file locations and did 
a reboot.
Hey presto - audio is now working.

Question I have - why when upgrading where these incorrectly built
kernel objects installed?

-- 
no audio for 82801DB ? possible kernel issue?
https://bugs.launchpad.net/bugs/355353
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