Bug#689268: Intel HD 4000 (Ivy Bridge) graphics freeze
Per,
I am still watching this issue for interest (my case I do consider as
"wrong" BIOS setting which solved it for me).
To my knowledge mtrr's are still used (not by i915 as Ben Hutchings
stated) and probably here certain manufacturers of boards/BIOS probably
set up different configurations.
Probably it ist worth to try this kernel parameter with Wheezy's
standard kernel:
"enable_mtrr_cleanup"
to allow kernel to re-arrange them and see if it has any influence in
your case?
Ingo
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