switching from nvidia to ATI on gentoo
From thelinuxwiki
emerge -av --quiet x11-drivers/ati-drivers eselect opengl set ati
add to make.conf # fglrx = FireGL and Radeon for X... now called AMD Catalyst VIDEO_CARDS="fglrx"
# emerge --ask --changed-use --deep @world /usr/src/linux . . . These are the packages that would be merged, in order:
Calculating dependencies... done! [ebuild R ] x11-base/xorg-drivers-1.14 VIDEO_CARDS="fglrx* -fbdev* -nvidia*"
Would you like to merge these packages? [Yes/No] yes
aticonfig