Nouveau - May 2014 - [Bug 75761] weston-launch no output - black screen

https://bugs.freedesktop.org/show_bug.cgi?id=75761

--- Comment #29 from Pekka Paalanen <ppaalanen at gmail.com> ---
Hmm, a third remote possibility came to mind. If the timestamp delivered with
the DRM pageflip event does not advance, I suppose Weston's fade-in
animation
might not advance either and therefore it never fades in. However this is hard
for me to believe, as I think it would have caused problems with Xorg, too...
wouldn't it?

Or maybe Xorg is only looking at the vblank counters, and you'd actually
need a
program using GLX_OML_sync_control to even see the timestamps?

One could check the timestamps by:
weston_log("%s: time %u.%06u frame %u\n", __func__, sec, usec, frame);
in compositor-drm.c page_flip_handler() function.

Mm, I'd like to see a weston log with that when you have the black screen
problem.

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