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Not sure how well I can explain this, but on my Lenovo X61 Tablet (Intel graphics) on Kubuntu 11.04 applications within KDE seem to freeze after a few seconds of use. Moving the mouse cursor to cause some kind of UI element to update seems to cause all frozen applications to continue redrawing a for a few more seconds. For example moving the mouse over a scroll bar or hovering over another window seems to trigger redrawing.

In addition this only happens when compositing is disabled on KWin. I would leave compositing enabled to work around the issue, but I would assume that would increase power consumption of the laptop.

A quick way to reproduce the issue for me is to run ZDoom (software renderer) and the freeze will occur shortly. Another program I noticed the issue with is Xournal (randomly stops drawing until aforementioned triggers at which point all lines drawn appear). I modified ZDoom to print something to the terminal continuously and that solves the issue indicating that the driver might be ignoring screen updates?

Is this a known issue and is there a known work around (outside of using OpenGL compositing of course)?

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closed as off topic by Marco Ceppi Feb 2 '12 at 3:39

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

This question should instead be filed as a bug report, thanks! Instructions here. – Jorge Castro Feb 2 '12 at 1:21

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