Bug#561206: same for ATI cards

[Rémi Letot]

Hello,

I have an ATI mobile card :

01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon
HD 3400 Series

I just switched to the free radeon driver since fglrx doesn't bring me
any improvement anyway (I don't game, and fglrx is currently too broken
on my setup for desktop compositing use).

I can confirm that I had the "slow gnome-shell" problem until I launched
it with CLUTTER_VBLANK=none.

With CLUTTER_VBLANK=none, gnome-shell is useable as long as I have only
one workspace (I'll report this in another bug report as I think those
are separate issues).

Thanks,
-- 
Rémi