[Bug 28410] OpenGL vsync no longer working properly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28410

--- Comment #46 from Pierre Ossman <pierre-bugzilla at ossman.eu> 2010-08-16 13:06:55 PDT ---
Hmm... I guess we had that discussion on irc. Anyway, the problem seemed to
boil down to:

CRTC 0 is forced on (via xorg.conf) and disconnected
CRTC 1 is on and connected

Somehow this caused confusion between userspace and the kernel as to which CRTC
is which. This caused vblank events to not be delivered as userspace asked for
CRTC 1 but the kernel only considered CRTC 0 to be running.

Alex Deucher guessed that some parts of the kernel might be looking at connect
state instead of on/off. Didn't really investigate further as I had no need to
force an output on so my immediate problem was solved.

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