"Two days ago we reported on hybrid graphics coming to Linux in
a crude form that allowed switching between graphics processors on
notebook computers that utilize dual graphics processors, one
that's meant to deliver the best energy efficient performance while
the other GPU is for maximizing the graphics performance in
demanding environments. Just 24 hours after this kernel patch hit
the Internet it already went through four revisions by Red Hat's
David Airlie, which delivered better switching and greater notebook
compatibility. Since yesterday this patch has already undergone a
few more revisions.
"The Linux hybrid graphics patch known as "vga_switcheroo" is
now on its sixth revision."