Michel Dänzer authored Jun 21, 2016 and Michel Dänzer committed Jul 28, 2016

This would normally return the same values the core RandR code passed to
xf86RandR12CrtcSetGamma before, which is rather pointless. The only
possible exception would be if a driver tried initializing
crtc->gamma_red/green/blue to reflect the hardware LUT state on startup,
but that can't work correctly if whatever set the LUT before the server
started was running at a different depth.

Even the pointless round-trip case will no longer work with the
following change.

Reviewed-by: Keith Packard <keithp@keithp.com>