Screen contamination

[dark_mail at gmx.net]

Am 22.04.2011 23:00, schrieb gene heskett:
> Greetings folks;
> 
> I have a problem.  Anytime I spend some time watching a news video on say 
> fox or cnn's sites, I wind up with screen background contamination in my 
> console windows of other workspaces.  Bit and pieces show up on the bottom 
> half of such a terminal window, remain stationary on the screen as the 
> terminal window is moved about, but are constrained by the border when the 
> terminal is moved, but comes right back as soon as the terminal windows 
> border encompasses that area of the screen again.
> 
> Using FF4.0 and a pclos repo supplied kernel version 2.6.38.2, on pclos, on 
> a quad core phenom, 4Gb of dram, and the latest .44 version of the dkms 
> installed nvidia-current driver on a 9400 series nvidia card.
> 
> FWIW, I recall seeing that also when I switched to the vesa driver, so 
> while it could be related, I am dubious.
> 
> What can I do to facilitate narrowing this down?
> 
> Thanks.

I'm by no means an expert, but could you try and disable page flipping
in the xorg.conf or check if it's turned on in the first place?

I ran into a similar looking issue with the switch to kernel 2.6.38,
which introduced KMS page flipping to my graphics card (radeon).

Checking for page flipping:
"cat /var/log/Xorg.0.log | grep -i Pageflip"

If it's reported as enabled, read on. :-)

In your xorg.conf, put the following line in the "Device" section,
reboot and check if the issue appears.


Section "Device"
	
        Option  "EnablePageFlip"        "off"

EndSection

If turning it off helps, maybe you're also being hit by bug
https://bugs.freedesktop.org/show_bug.cgi?id=35452

This one is about the ati driver, though. So maybe it's unrelated. I
hope I'm being helpful.