Comment 19 for bug 1074779

i'm running linux mint 14 with cinnamon, i5 on a Z77 chipset, and radeon 7850.
(i'm kind of noob whenit comes to this) I tried this fix, but still have this when tryping inxi -Gx

Graphics: Card: Advanced Micro Devices [AMD] nee ATI PITCAIRN PRO [Radeon HD 7800 Series] bus-ID: 01:00.0
           X.Org: 1.13.0.901 drivers: ati,vesa,radeon (unloaded: fbdev,intel) Resolution: 1920x1080@0.0hz
           GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.1, 256 bits) GLX Version: 2.1 Mesa 9.1-devel Direct Rendering: Yes

What should i try to put instead of "intel" ? radeon or amd ?

(it's getting nervewracking, any hight paced video makes the screen glitch, like if the processor is not able to follow the refresh rate and the videostream at the same time)