[Bug 28410] OpenGL vsync no longer working properly

[bugzilla-daemon at freedesktop.org]

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

--- Comment #20 from Pierre Ossman <pierre-bugzilla at ossman.eu> 2010-07-07 04:01:18 PDT ---
Looks like some kernel issue. Xorg is calling drmWaitVBlank() with proper
arguments as far as I can tell:

    fprintf(stderr, "Current counter: %lld\n", (long long)current_msc);
    fprintf(stderr, "Waiting for %lld (0x%08x)\n", (long long)*target_msc,
vbl.request.type);

in radeon_dri2_schedule_swap() results in:

Current counter: 132192
Waiting for 132192 (0x14000000)

A vblank event never occurs though so the Xorg stack just sits there forever.

And turning on debug in the kernel shows that vblank interrupts aren't enabled
when this is going on. They are running for a while just as the X server is
starting, but then they are disabled again.

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