http://buntudot.org/people/~jdong/backports/edgy/58721/xserver-xorg-video-mga_1.4.4.dfsg.1-1~6.10prevu1_i386.deb
I've made a test backport of debian sid's mga driver. Please confirm whether or not this resolves the issue, so we can move forward.
http:// buntudot. org/people/ ~jdong/ backports/ edgy/58721/ xserver- xorg-video- mga_1.4. 4.dfsg. 1-1~6.10prevu1_ i386.deb
I've made a test backport of debian sid's mga driver. Please confirm whether or not this resolves the issue, so we can move forward.