For what it's worth, I'm now running on the old 2.4 driver and I'm still
getting those MTRR errors, but no freezing. Happens on both XAA and EXA
with the old driver, seemingly when X initialises. I can force these
errors by 'zapping' X at the login screen.
Sidenote - Interesting excerpt from Xorg.0.log:
(==) intel(0): VideoRam: 131072 KB
(II) intel(0): Attempting memory allocation with tiled buffers.
(WW) intel(0): xf86AllocateGARTMemory: allocation of 1536 pages failed
(Cannot allocate memory)
(WW) intel(0): Allocation error, framebuffer compression disabled
(WW) intel(0): xf86AllocateGARTMemory: allocation of 10 pages failed
(Cannot allocate memory)
(II) intel(0): Allocating 3840 scanlines for pixmap cache
(WW) intel(0): Failed to allocate texture space.
(II) intel(0): Tiled allocation failed.
(II) intel(0): Attempting memory allocation with untiled buffers.
(WW) intel(0): xf86AllocateGARTMemory: allocation of 10 pages failed
(Cannot allocate memory)
(II) intel(0): Allocating 3840 scanlines for pixmap cache
(II) intel(0): Untiled allocation successful.
--
[i855] Jaunty - X freezing on intel 855GM - MTRR issue (UXA/EXA)
https://bugs.launchpad.net/bugs/370292
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