I had the same problem as described here. Using xserver-xorg-video-intel - 2:2.5.1-1ubuntu5~intrepid from https://edge.launchpad.net/~intel-gfx-testing/+archive as Bryce Harrington recommended to test solved the problem.
I also tried the older version 2.4.3, but the problem persists there. Maybe I'll have time to pin down exactly when the fix was introduced after Christmas.
I had the same problem as described here. Using xserver- xorg-video- intel - 2:2.5.1- 1ubuntu5~ intrepid from https:/ /edge.launchpad .net/~intel- gfx-testing/ +archive as Bryce Harrington recommended to test solved the problem.
I also tried the older version 2.4.3, but the problem persists there. Maybe I'll have time to pin down exactly when the fix was introduced after Christmas.