Ingo wrote:

> Per,

Forwarding to Per, thanks.

> I am still watching this issue for interest (my case I do consider as
> "wrong" BIOS setting which solved it for me).

A report for yours would still be worthwhile, so we can try to find a
workaround in the kernel for the sake of others running into the same
problem.  I imagine other OSes work fine with the default BIOS
settings and that it would be possible for Linux to learn to as well.

> 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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