More Apple brain damage, it fixes the modesetting failure on an eMac
G4 (fdo bug 29810).
Reported-by: NZoltan Varnagy <doi@freemail.hu>
Signed-off-by: NFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>