Bug 83021

Summary:	Separate X screens --> Xvideo is vsynced to primary screen only
Product:	xorg	Reporter:	Jan Janecek <janjanjanx>
Component:	Driver/nouveau	Assignee:	Nouveau Project <nouveau>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

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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