It appears that the i915 family driver used to insert the mtrr in older
kernels and returns in the latest drivers in the 2.6.30-rc series. It
appears that the current driver only inserts the mtrr when GEM is being
used. Had a go at backporting the fix for this from upstream. I have
built kernels with this patch, and they seem to work on my Intel based
laptop:
$ cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back
reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg02: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
reg03: base=0x0be000000 ( 3040MB), size= 32MB, count=1: uncachable
reg04: base=0x0ffe00000 ( 4094MB), size= 2MB, count=1: write-protect
reg05: base=0x0bde00000 ( 3038MB), size= 2MB, count=1: uncachable
reg06: base=0x0d0000000 ( 3328MB), size= 256MB, count=1: write-combining
If those of you who are affected by this could test out the Jaunty
kernels below and report back here that would be very helpful. In
particular could you report the output of 'cat /proc/mtrr' with the new
kernel. Kernels are at the URL below:
http://people.ubuntu.com/~apw/lp314928-jaunty/
--
[i915GM] MTRR entry gets removed when restarting xorg - causes corruption on
ttys
https://bugs.launchpad.net/bugs/314928
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