[Bug 328918] Re: [i945] underrun on pipe A! prevents Xorg from starting.

[Geir Ove Myhr]

And  can you also attach the Xorg.0.log from Jaunty? To get the most information out of it, you should add 
  Option "ModeDebug" "true"
to you xorg.conf, restart X (by for example logging out and in again) and then grab /var/log/Xorg.0.log.

I suspect the EDID error you get is because the get-edid program doesn't
properly support the E-EDID standard. If you run `get-edid | hd` you
will see that the second last byte is 01, which means that there is one
extension. For most monitors this is 00 (for no extensions) and I guess
that maybe get-edid does not support extensions. There is a new version
of EDID in the PPA https://launchpad.net/~intuitivenipple/+archive/ppa/
which you may try (see also bug
https://bugs.launchpad.net/debian/+bug/242043), but I don't know if this
issue addressed here. Anyway, this should be independent of the EDID
handling in Xorg.

Also, if you have a ~/.config/monitors.xml, please rename it or delete
it as there may be some old resolution settings there.

-- 
[i945] underrun on pipe A! prevents Xorg from starting.
https://bugs.launchpad.net/bugs/328918
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