Bug#234025: port of milky screen patch to 4.3.0-7

I did a simple-minded port of the milky screen patch by Hui Yu that I found at: http://marc.theaimsgroup.com/?l=xfree86&m=105582853120655&w=2 I think it includes the following issues from what google has been able to find: 274. Do not drop H&V sync during screen blanking for Radeon (B

Bug#234025: "milky screen" with 7500 -- no s-video cable attached

n as I can. Jonathan Albrecht