Hm.  Running “vbetool vgamode” while using a kernel-modesetting driver
like i915 is unlikely to do anything more useful than locking up your
GPU - as you've found :).

It's going to prod GPU registers behind the back of the i915 driver,
which will go merrily on assuming that it's the only thing driving the
GPU, and then fall over when it prods the hardware in a (now)
inappropriate way.

I'm marking this as invalid.  There's nothing we can do to stop people
scribbling over GPU state in this way - it requires root anyway - and no
reasonable way for the intel driver to handle other code messing with
the GPU behind its back.

-- 
[i965gm] GPU lockup a37135ff (EIR: 0x00000010)
https://bugs.launchpad.net/bugs/648299
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which is subscribed to xserver-xorg-video-intel in ubuntu.

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