i915: wrong framebuffer size in 2.6.36-rc3

[Sven Joachim]

On my laptop which has a 1280x800 display, only the upper left 848x480
pixels are used on the console in 2.6.36-rc3.  The resolution is
correct, but /sys/class/graphics/fb0/modes looks like this:

U:848x480p-0

This is a regression from 2.6.35.  The graphics card according to lspci:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)

Sven