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  • #11
    Originally posted by narciso View Post
    Kwin dev's passed the ball to nvidia drivers.
    KWin developers just trying to find root of the tearing issues with nVidia drivers: http://blog.martin-graesslin.com/blo...#comment-50548
    Last edited by RussianNeuroMancer; 09-13-2012, 10:01 AM.

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    • #12
      Well, I was told that it's X11's fault and that the low power mode of the GPU is enough for Windows Aero, but not enough for X11. The GPU can't keep up with the memory bandwidth requirements of X11 (yes, that means that compositing on X11 is a resource hog compared to Windows, which is supposed to be light-weight.) Wayland is supposed to fix that.

      The result is framebuffer tearing (which in the end is just as visible as screen tearing.) Switching the GPU to higher speed gets rid of that tearing.

      Edit:
      This is the thread: http://forum.kde.org/viewtopic.php?f=111&t=99090

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      • #13
        Hi, I also work on the NVIDIA Linux Graphics team and have been investigating the kwin/VDPAU interaction problems.

        There is an upstream fix for the performance issue described in this link in kde-workspace; see

        https://projects.kde.org/projects/kd...0d7dc5d08401a5

        I have backported this patch to kde-workspace_4.8.4a-0ubuntu0.1; see http://pastebin.com/8DmsyTP7 . I hope this helps!

        Brian Nguyen
        NVIDIA Linux Graphics

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        • #14
          Hi, I am also a developer on the NVIDIA Linux Graphics team, and I have been investigating the performance issue described in the nvnews thread (http://www.nvnews.net/vbulletin/showthread.php?t=173519).

          A fix has been submitted upstream to kde-worskpace; see https://projects.kde.org/projects/kd...0d7dc5d08401a5 . I have backported this patch to the kde-workspace_4.8.4a-0ubuntu0.1 version; see http://pastebin.com/8DmsyTP7 .

          I hope this helps!

          Regards,
          Brian Nguyen
          NVIDIA Linux Graphics

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