Ever since I upgraded to F8 from F7 there seems to be white lines showing up as the CPU is being used. This didn't happen in F7 and the xorg.conf files look exactly the same. I had the same type of problem in Ubuntu so I'm convinced it's a display driver issue. Any ideas on a setting or something?
nVidia guy myself, but ATI has got some problems. Maybe try the vesa thing just to see, that would narrow it down to the driver. I have read some stuff about an ATI problem but I am not the guy for that.
I tried Vesa but my computer simply froze up upon loading X. Maybe I'll revert back to Fedora 7 and see if I get better stability. It's disappointing though, you expect things to work better in new releases. Oh well.