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Old 10-06-09, 05:37 PM   #1
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Default Window redraw problems caused by OnDemandVBlankInterrupts

Hi all,

I'm using X.Org X Server 1.6.3 with the 190.36 driver. I have experienced redraw problems with compiz where parts of windows were not correctly updated and sometimes even remained completely black. I have seen similar problems with the 185.18.36 driver. The problems did NOT go away even when I enabled "Force synchronization between X and GLX" in the compiz workaround plugin.

However, the problem did go away immediately after I disabled OnDemandVBlankInterrupts in my Xorg.conf. Therefore, I believe the redraw problem is related to that option.

This is a heads up to the NVIDIA developers so they can start digging in that area. The chip is a Quadro NVS 140M.
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Old 10-06-09, 06:33 PM   #2
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Default Re: Window redraw problems caused by OnDemandVBlankInterrupts

Not to discredit your issue, but as another datapoint I've had OnDemandVBlankInterrupts turned on since Day 1 (I have a notebook and this helps a little with power consumption; it's enlightening to run "powertop" sometimes and see what's waking your system out of idle, even for folks like you on desktop systems) and haven't seen this yet.
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Old 10-07-09, 11:45 AM   #3
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Default Re: Window redraw problems caused by OnDemandVBlankInterrupts

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