Your GPU is extremely unhappy. The fallback to vesa is because it fails
even to initialise its command rings, and it looks like it falls over
regularly even if it manages to get past that.
I would strongly advise you looks for a BIOS update, and please try a
very recent kernel. I would also recommend drm-intel-experimental (from
the kernel mainline ppa) as our detection of broken firmware has
improved along with our tolerance.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/980058
Title:
Sometimes see vertical bands, artifacts across screen after boot
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