"Beginning next month with the Catalyst 9.4 release, support
for the R300/400/500 generations of graphics processors will be dropped
from AMD's mainline ATI driver. In a move they hope will allow them to
focus their efforts on newer and upcoming graphics processors, the
mainline Catalyst driver on both Linux and Windows will stop supporting
cards older than the Radeon HD 2000 series. Linux customers affected
will be encouraged to use their open-source driver stack (xf86-video-ati
or xf86-video-radeonhd and Mesa) or stay with the Catalyst 9.3 driver."