gma500: Attempting to load psb_gfx causes NULL pointer dereference error

From: Dainius (GreatEmerald)
Date: Sat Dec 24 2011 - 15:36:40 EST

When attempting to launch a Linux system with any kernel version with
psb_gfx, I always get an error at boot time. The error includes these

ioremap error for 0x7f579000-0x7f57a000, requested 0x10, got 0x0
BUG: unable to handle kernel NULL pointer dereference at (null)
Oops: 0000 [#1] SMP

The full error message and a stack trace can be found here:
On openSUSE with kernel 3.1.0 -
On Kubuntu with kernel 3.2.0 -

The device I'm using is running on the Oak Trail platform (it's a
Fujitsu Stylistic Q550 tablet).

One strange thing about it is if I try to boot the system with the
vga=0x318 option, it throws me this error on boot, but it still loads
the X server, although with the non-native resolution and seemingly
without backlight control and other features. It still seems that the
psb_gfx driver is running, however, since lsmod lists it and fbdev
seems to be running. And if I don't pass the vga option, the X server
crashes, complaining about /dev/fb0 not existing and fbdev failing to
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