To increase performance of the open-source radeon driver, people here always say to disable swapbufferswait and enable color tiling in the xorg.conf options.... but, where it is ? I guess it should be at /etc/X11/ but it never appears there....

Also, I have a notebook with 2 AMD graphics chips: one HD4250 for powersave mode, and one HD5650M for performance.... so, is there a way I can switch to the performance chip with the open driver ? vga_switcheroo can work the same way it works for intel chip <-> radeon card switch


Thanks a lot in advance, and sorry for bad English...