[Nouveau] [Bug 83021] New: Separate X screens --> Xvideo is vsynced to primary screen only

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83021

          Priority: medium
            Bug ID: 83021
          Assignee: nouveau at lists.freedesktop.org
           Summary: Separate X screens --> Xvideo is vsynced to primary
                    screen only
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: janjanjanx at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

I use two separate X screens and Xvideo is vsynced only to the primary display.
The DRM however supports syncing to secondary display as well (using
_DRM_VBLANK_SECONDARY).
I looked at the xf86-video-nouveau source, and it looks like it tries to
determine on wich display the window is by using the window position (in the
nv_window_belongs_to_crtc function). I think this method only works when there
is one X screen assembled of two displays, but it does not work with two
separate X screens.

Linux 3.15.10, Xorg 1.16, xf86-video-nouveu 1.0.10
GPU GTX 560Ti

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