Comment 38 for bug 914773

This appears to have been fixed in Mesa some time by 12.10. Last time I could reproduce it was in oneiric (Mesa 7.11) but can't reproduce it now in quantal (Mesa 9.0). Given the comments on this bug kind of stopped around April, it could be that the fix was released in Ubuntu 12.04 with Mesa 8.0...

With quantal right now I can confirm that radeon's glXWaitVideoSyncSGI no longer hangs when the screen is asleep. I see it returning regularly. So even if no leak was explicitly fixed, the fact that it doesn't hang at all any more could be working around any potential leak.

Next step is to find out if the bug is fixed in precise too (Mesa 8.0.4).