[Bug 29726] New CRTC ID query breaks Radeon DRM in Zaphod mode

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https://bugs.freedesktop.org/show_bug.cgi?id=29726

--- Comment #10 from Lucas <lvella@xxxxxxxxx> 2010-10-27 19:48:00 PDT ---
(In reply to comment #9)
> should be fixed on master DDX now.

Thank you so much for your commit. The vsync of the proprietary driver was
broken in the second display in new Ubuntu, so I switched to the free driver,
to find it much better than when I last saw it. No way I would go back to
fglrx, but I still could not use the second display (my TV) the way I was used
to (to watch movies, separated displays/screens, vsync on) because of this
bug... I was using big desktop mode until now!

I just tested the driver with the fix, and vsync seemed to work in zaphod mode,
in both screens. DISPLAY=:0.0 is my monitor with 1280x1024 at 60Hz and
DISPLAY=:0.1 is my TV with 1920x1080, also at 60Hz. I played a movie with
mplayer in both screens (gl backend, vsync on) and I could see no visible tear
that was obvious when vsync was off. glxgears is also limited at 60 FPS, as it
should be.

Now I am not sure how to test it without relying on my eye and a movie (I am
satisfied with the result). My test may be unreliable, since I was not able to
shut off vsync in mplayer in a way that I could see the tears I was used to see
with vsync=off in fglrx. Env var vblank_mode=0 shows no artifacts, neither when
running mplayer nor glxgears, although its FPS is not limited at 60 anymore.

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