[Bug 90508] login screen and desktop wayland session are jerking on Intel® Sandybridge

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90508

Ander Conselvan de Oliveira <conselvan2 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #6 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
It seems that when wayland starts the CRTC is active but the primary plane
doesn't have an FB. A call to drmModeCursor() is done before any mode set, and
that causes the watermarks to be updated, but the update considers the CRTC is
inactive because of the lack of a primary fb. The drmModeSetCrtc() call that
follows is short circuited to a flip, so that also doesn't update the
watermarks, causing the system to run with watermarks set for a disabled CRTC.

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