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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - drawing performance worse than X"
href="https://bugzilla.gnome.org/show_bug.cgi?id=763350#c18">Comment # 18</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - drawing performance worse than X"
href="https://bugzilla.gnome.org/show_bug.cgi?id=763350">bug 763350</a>
from <span class="vcard"><a href="page.cgi?id=describeuser.html&login=rstrode%40redhat.com" title="Ray Strode [halfline] <rstrode@redhat.com>"> <span class="fn">Ray Strode [halfline]</span></a>
</span></b>
<pre>(In reply to Christian Hergert from <a href="show_bug.cgi?id=763350#c15">comment #15</a>)
<span class="quote">> cogl-winsys-egl-kms.c specifies a page_flip drm event handler, but not
> vblank_handler (which is what weston uses).</span >
Note page flips are synced to vblank by the kernel. DRM vblank events are an
older, deprecated api. There's a patch in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - mutter wayland doesn't work on machines with drivers that don't handle page flips"
href="show_bug.cgi?id=746042#c10">bug 746042 comment 10</a> 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.</pre>
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