To hear sound on your XPS and to solve all gnome bugs and error messages you have to compile ALSA driver for 82801H (ICH8 Family) HD Audio Controller.
To do that you have to compile latest ALSA driver (TnX to the helpers of ubuntu IRC support):
follow these steps in a shell:
you can try to sobstitute "alsa-driver-1.0.15rc3.tar.bz2" with the latest ALSA version, if work please post to me
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cd alsa-driver-1.0.15rc3
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./configure --with-cards=hda-intel && make
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sudo cp ./modules/snd-hda-intel.ko /lib/modules/$( uname -r )/ubuntu/media/snd-hda-intel/
reboot and good luck
rember that the channels in ALSA drivers are muted by default, so use :
in a shell and in the alsamixer window turn on all volume bars.
In my experience all get well, but if no sounds come from your speakers try to remove and install libasound using synaptic.
There's the last think to fix.... the internal MIC.
But I really don't know how to fix now. Suggestions are appreciated.