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Thread: Triple monitor very slow

  1. #1
    Join Date
    Dec 2010
    Beans
    3

    Triple monitor very slow

    Hi,

    I'm running Kubuntu 10.04 with a triple monitor setup on two videocards: one video card (nVidia 9500 GT) runs two screens, while the other one (nVidia GT 210) runs a single screen. I use Xinerama in the X11 configuration, see xorg.conf. This is working great, except that after an hour (someimes two, sometimes directly) everything gets really slow: when I move my mouse to an icon on the desktop, it highlights after a second or two (not directly), when I move a window it leaves a trail of windows behind it, when I close a window the desktop shows after a second or two, when I type text in Konsole it appears after a really short but annoying delay, etc. When I log out and restart the X11 server everything is fast again, but after an hour it gets slow again.

    The CPU usage is ~10% according to the desktop widget (PhenomII X4 965, so that should be fast enough), so that shouldn't be the problem. However, when looking with htop, X is always using 20-50% of the CPU, which is a bit high.

    When I place back my old xorg.conf (with TwinView over 2 monitors and the third one not enabled), everything is working smoothly, even after 5 hours. In Windows the monitors are also working fine.

    Anybody any idea how to solve this?
    Last edited by oxan; December 4th, 2010 at 08:20 PM. Reason: typo

  2. #2
    Join Date
    Dec 2010
    Beans
    24

    Re: Triple monitor very slow

    I'm having a similar issue, everything is just quite slow even from startup. I'm running a quad core with 3 monitors...CPU usage is only around 33% so I'm not sure why X is so slow.

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