Created attachment 19062 [details]
Demo Code - directly from the GtkGlExt examples

I'm working on a little OpenGL app, which doesn't permanently redraw at a fixed framerate (only when animations are running or expose events are triggered).

It works really nicely as long as there's no compositor around. I tested two compositors (metacity's current ony and xcompmgr). As I tested different composite managers, I think the bug is in the driver.

I'll attach sourcecode for a simple demo application (using GtkGLExt - debian package libgtkglext1-dev) which works fine in the non-composited environment but in a composited environment, when I move the window from one workspace to the other, the application doesn't redraw (I'm seeing random-memory artifacts in the window).

I'll attach demo source code.

DEBUG INFORMATION:
> dpkg -l xserver-xorg-video-intel metacity xcompmgr
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                          Version                       Beschreibung
+++-=============================-=============================-==========================================================================
ii  metacity                      1:2.22.0-0ubuntu4             A lightweight GTK2 based Window Manager
ii  xcompmgr                      1.1.3+git20071107-0ubuntu1    X composition manager
ii  xserver-xorg-video-intel      2:2.2.1-1ubuntu13.6           X.Org X server -- Intel i8xx, i9xx display driver