Bug 83021 - Separate X screens --> Xvideo is vsynced to primary screen only
Summary: Separate X screens --> Xvideo is vsynced to primary screen only
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Nouveau Project
QA Contact: Xorg Project Team
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Blocks:
 
Reported: 2014-08-24 20:54 UTC by Jan Janecek
Modified: 2014-08-24 23:33 UTC (History)
0 users

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Description Jan Janecek 2014-08-24 20:54:59 UTC 
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
Comment 1 Ilia Mirkin 2014-08-24 20:57:04 UTC 
There have been a bunch of fixes to this logic in git -- does this issue still happen with http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/ ? Specifically I'm thinking of http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=6ad053788e804f3a8bd36ee3653ec95e7df62623
Comment 2 Jan Janecek 2014-08-24 23:33:45 UTC 
It is indeed fixed in newest GIT, I should have tried that before filing the bug.

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