Bug#451791: 2:2.2.0+git200 (experimental) fixes problem for me (865G)

[Arthur Korn <arthur@korn.ch>]

Hi

Also had distorted rendering with xservers from unstable,
apperently of transparent areas. Disabling antialiasing and
shadowing fixed many problems. Interestingly iceweasel wasn't
affected at all, while gimp was (and all qt apps I tried).

Xserver 7.2-5 worked.

xserver-xorg-video-intel 2:2.2.0+git20080107-1 works also

Using "AccelMethod" "XAA" fixed it too with xservers which
otherwise don't work (from unstable).

This is a desktop machine with onboard graphics, I'm not sure it
acutally uses frame-buffer compression.

I'd be happy to help in tracking this down, just tell me what
you need.

HTH, Arthur