Comment 48 for bug 969860

OK, thanks to George's tip I finally solved the problem just disabling "tear-free" in catalyst center (admin mode) and the configuration proposed in the workaround:

(obviously with the proprietary ATI fglrx)

1. Open Catalyst Control Center (admin mode).
2. Display Options -> Tear Free-> disabled
3. Go to 3D > More Settings.
4. Set "Wait for vertical refresh" to "On, unless application specifies".

With tear-free enabled, I always get compiz at 100% inmediatly when close the lid of my laptop or 30 minutes after (aprox).

I've tried to replicate the problem many many times with tear-free disabled but is imposible, now is working flawless. My laptop and compiz process enjoys a cool and quiet idle mode indefinitely.

I suppose that "tear-free" is enabled by default in the opensource driver, this would explain why this occurs with this driver too.

___________________________________________
Ubuntu 12.04
Catalyst Control Center: 12.4
Driver package: 8.96.7-120312A-135598c-ATI
2D Driver: 8.96.4