Poor compositing performance on 965Q chipset with intel 2.2.1 driver

John Ettedgui john.ettedgui at gmail.com
Fri May 9 17:28:31 PDT 2008

> Barry Scott wrote:
> On another 965Q that exhibits the problem, we get:
> # cat /proc/mtrr
> reg00: base=0x00000000 (   0MB), size= 512MB: write-back, count=1
> reg01: base=0x1f000000 ( 496MB), size=  16MB: uncachable, count=1
> reg02: base=0xe0000000 (3584MB), size= 256MB: write-combining, count=1
> >>* That looks suspiciously like the "fan controller" related BIOS bug
> *>>* that turned up not long ago. Can't remember if it made it into
> *>>* bugzilla, but it was fixed by a bios upgrade ...
> *>>*
> *>>* Suggest looking in BIOS options for something to do with a fan and
> *>>* turning it off.
> *>>*
> *Assuming you're thinking of
> http://lists.freedesktop.org/archives/xorg/2007-June/025105.html, we
> don't have the necessary options in the BIOS, but some of our boxes that
> demonstrate poor performance don't have the same block of bad-looking
> MTRRs.
> --
> Any more ideas?
> Simon Farnsworth

Hello people,

I am dropping myself in as I have the same issue on a mobile 965 (and also
get error message about the fan if I install acpid).

My mtrr looks normal to me but I may be wrong:
cat /proc/mtrr

reg00: base=0x00000000 (   0MB), size=1024MB: write-back, count=1

reg01: base=0x3f700000 (1015MB), size=   1MB: uncachable, count=1

reg02: base=0x3f800000 (1016MB), size=   8MB: uncachable, count=1

reg03: base=0xd0000000 (3328MB), size= 256MB: write-combining, count=1

I'll try your ideas too ;)


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