system lags with fglrx, Chrome and Vsync

[Dennis-martin-herbers]

Using the latest Ubuntu 12.10 build, the system stutters (to the point that the mouse doesn't move for a few milliseconds, very noticeable and annoying) when using the latest AMD Catalyst driver (fglrx 9.000 from the quantal repository), Google Chrome and overwriting the driver software blacklist in about:flags (normally it should be accelerated by default anyway, it does with the driver from AMD.com and Ubuntu 12.04).

You you hover over some links, like the ones on engadget.com on the right (recent reviews), it stutters A LOT. When you go to about:flags and check "disable GPU Vsync" it runs smoothly and perfectly fine like it did with Compiz 0.9.7.x.

Also while hovering/moving over links (with Vsync on/off), CPU usage goes up till 60% on my quadcore, but that's another story and has always been like that).

I know there's one more Vsync related fix coming with the final compiz 0.9.8.4 release, but I think I've read it only matters for nVidia.

[Daniel van Vugt (vanvugt)]

The behaviour of applications that do their own vsync is entirely controlled by the graphics driver (and the application).

Compiz has nothing to do with it really.

[Daniel van Vugt (vanvugt)]

If you found that ALL applications where affected, then the bug would relate to compiz.

[Dennis-martin-herbers (dennis-martin-herbers)]

This is fixed with the AMD Catalyst/fglrx 9.01 release stream (aka Catalyst 12.11), among other 2D improvements.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rasmus Iversen (rasive)]

I still have this bug with the Legacy drivers. Disabling gpu vsync fixes the problem, but certain pages wont load and certain plugins wont work correctly.