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Bug#524340: Reproducible GUI lockups

On Thu, Apr 16, 2009 at 19:51:52 +0200, J.H.M. Dassen (Ray) wrote:
> In dmesg, I've noticed the following, which may be related:
> 	[drm] MTRR allocation failed.  Graphics performance may suffer.

Googling for this message led me to
which suggests

Unfortunately, this has not made any appreciable difference; the boot
messages still report
	[drm] Initialized drm 1.1.0 20060810
	pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
	pci 0000:00:02.0: setting latency timer to 64
	mtrr: type mismatch for d0000000,10000000 old: write-back new: write-combining
	[drm] MTRR allocation failed.  Graphics performance may suffer.
and the Xorg log still shows it going for EXA instead of UXA:
	(II) intel(0): Integrated Graphics Chipset: Intel(R) G33
	(--) intel(0): Chipset: "G33"
	(--) intel(0): Linear framebuffer at 0xD0000000
	(--) intel(0): IO registers at addr 0xE5600000
	(WW) intel(0): libpciaccess reported 0 rom size, guessing 64kB
	(==) intel(0): Using EXA for acceleration

For completeness, "cat /proc/mtrr" currently provides this map:
	reg00: base=0x000000000 (    0MB), size= 4096MB, count=1: write-back
	reg01: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
	reg02: base=0x0bf800000 ( 3064MB), size=    8MB, count=1: uncachable
	reg03: base=0x0bf700000 ( 3063MB), size=    1MB, count=1: uncachable
	reg04: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
	reg05: base=0x0bf600000 ( 3062MB), size=    1MB, count=1: write-through

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