Window redraw problems caused by OnDemandVBlankInterrupts

Grond · 10-06-09, 05:37 PM

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.

kcrudup · 10-06-09, 06:33 PM

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.

Dizzle7677 · 10-07-09, 11:45 AM

See also ...
http://www.nvnews.net/vbulletin/show....php?p=2093726

10-06-09, 05:37 PM	#1
Grond Registered User Join Date: Aug 2008 Posts: 2	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.

10-06-09, 06:33 PM	#2
kcrudup Registered User Join Date: Apr 2004 Location: Los Angeles, CA 90034 Posts: 96	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. __________________ 8600M GS 512MB (HP Pavilion dv9000 CTO)

10-07-09, 11:45 AM	#3
Dizzle7677 Registered User Join Date: May 2008 Location: Relativity Posts: 194	Re: Window redraw problems caused by OnDemandVBlankInterrupts See also ... http://www.nvnews.net/vbulletin/show....php?p=2093726 __________________ Elephants can fly but they have no reason to. ------------------------------------------ Phenom II X3 720 @ 3.5Ghz \| Asus M4A785-M \| 2 Gig Crucial DDR2 @ 960 Mhz \| GeForce GT 440 1024 MB \| Linux 3.6.1 / Ubuntu 12.04 / W.I.N.E v1.5.14