I can't play games with my 7770 under Ubuntu 13.10 (and Ubuntu Gnome) because there is always some kind of input lag (mostly pretty severe) and very low fps in games which have way lower requirements than 7770 - TF2, Dota 2, Xonotic, some Wine games, even Unigine Benchmark has pretty terrible performance (10 - 20 fps everywhere).
I had better performance with GeForce GTS 250 (from 2009 >.< ) than with 7770, by like 150-200% and no input lag or other bugs.
1. Reinstalling whole system.
2. Latest beta, beta before and those drivers from Ubuntu repo.
3. 3.12 kernel.
4. Changing options in CCC.
No change. Oh and Vsync is off in both CCC and games.
Ubuntu Gnome 13.10 with all latest updates
Phenom II x4 B55 @3.1Ghz
Asus M4N68TM LE V2
4Gb A-Data 1333Mhz
Gigabyte Radeon 7770 Ghz Edition