With both the 1.0.9755 and the 100.14.03 drivers I get a strange issue whenever I play 1080i content at 1080i. This is on a CRT RPTV connected via DVI (I also have this problem via component).
The problem appears to be a syncing issue whenever 1080i content is played at 1080i. I am guessing it is a syncing issue. I have no way to verify. It's on a timer apparently. The problem will persist for 15 seconds and then go away for 15 seconds and then will come back for 15 seconds etc... 720p and 480i/p content will look just fine. The only way I know how to describe it is blurriness. Parts of the picture (typically around action) appear to jump or jerk.
I can observe the problem with both mythtv and mplayer.
When connected via DVI I use a custom modeline since I have the problem discussed in this thread
. With component connections I don't use the custom modeline.
I have attached a bug report. It includes the xorg.conf I use when I am using the DVI cable.