Sync-to-vblank causes hang (was Re: XVideo performance degradation with 8178)
Two bug reports have gotten mixed into this thread. I'm sorry for the confusion.
The first bug report - the one mentioned in the original subject - regards a performance degradation. That one showed up first for me in 8178. (I wasn't able to try 8174 because of the 6200 / tv-mode bug.)
The second bug I mentioned, the sync-to-vblank problem, has been present in all versions that support the 6200 card.
Despite the title, most of this thread deals with the second problem. All of the bug reports, except the first one, deal with this second problem.