On Fri, 11 May 2012 11:06:37 +0200 Oliver Seitz <info at vtnd.de> wrote: > Hi, perhaps one of the experts can answer this in a few words... > > SandyBridge can prevent tearing only by using pageflipping. > > pageflipping on Xorg always flips the whole framebuffer, so it can only > be synced to one output device. > > The vaapi-enabled MPlayer plays nice in fullscreen mode (via vaapi or > gl), but sometimes tears in windowed mode. > > Is this a MPlayer, Xorg, intel driver or SandyBridge problem? It's clear > that pageflipping can not be syncronized to two displays at once, but I > see no theoretical need for a video being fullscreen to make use of > pageflipping. > > Thank you for any hints! It's partly a hardware limitation, but it's really a bug in xf86-video-intel since we don't work around it properly. It should be possible for us to use flipping in the DDX all the time by rendering everything to an offscreen buffer, but that involves some surgery to the DDX we haven't done yet. -- Jesse Barnes, Intel Open Source Technology Center
