lspci -vvnn:
Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]

cat /proc/mtrr:
reg01: base=0x0e0000000 ( 3584MB), size=  512MB, count=1: uncachable

/proc/mtrr already has the region but it is not "write-combining". Is
there any way to reset it or everything is fine and I shouldn't do
anything?

-- 
[i915GM] MTRR entry gets removed when restarting xorg - causes corruption on 
ttys
https://bugs.launchpad.net/bugs/314928
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