[Wayland-bugs] [Bug 763350] drawing performance worse than X

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763350

--- Comment #18 from Ray Strode [halfline] <rstrode at redhat.com> ---
(In reply to Christian Hergert from comment #15)
> cogl-winsys-egl-kms.c specifies a page_flip drm event handler, but not
> vblank_handler (which is what weston uses).

Note page flips are synced to vblank by the kernel.  DRM vblank events are an
older, deprecated api.  There's a patch in bug 746042 comment 10 to make mutter
use them, but it had problems with hotplug so we just fall back to tearing for
old drivers that don't support page flipping.

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