Hello,

I am using Kubuntu 12.04 with 2 monitors. After some time the monitor on the right becomes unusable. I see around 15px offset with misaligned icons and windows. Only rebooting solves the problem.

Please see the photo to see the problem: http://s14.postimage.org/v577d20hc/IMG_ ... 110802.jpg

How can I solve this problem?

Thank you.

which driver installed?

does disabling composting help (alt+shft+F12)? no idea if relevant, just easy to test

NVidia driver is installed.

No, unfortunately, the combination did not solve the problem.

which driver and what card?

Code: Select all

 glxinfo | grep OpenGL

I upgraded to 12.10. I will let you know if this solved the problem, otherwise will try your command.

Thank you.

all the command does is display the card and driver installed which may be helpful (or not)

Can you capture the issue with a screenshot as well?
If not rather check the temperature of your GPU.

I posted an image on my first post. When I took a screenshot, it seems OK. I will let you know after using the new Kubuntu

I saw the photo, thus wondered whether this also is on a screenshot.
Is that screen btw. on a vga -> dvi adaptor?

Ok, the problem continues. Here is what I got after execution of glxinfo


OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: Quadro 600/PCIe/SSE2
OpenGL version string: 4.2.0 NVIDIA 304.43
OpenGL shading language version string: 4.20 NVIDIA via Cg compiler

I checked today and saw that the problem is on both screens.

If this occurs after "some" time, is not compositing related and can not be captured with a screenshot there's a *high* likelyhood of a HW defect, probably temperature driven (since both screens are affected it's unlikly both cables or panels) or setup beyond specs

nvidia-settings -tq GPUCoreTemp

If that value is > 70°C you can start to worry.
If it's > 90°C your GPU is too hot.
If it's > 100°C your GPU will soon die - and so will your box, because other HW is not so easy on temperature.

If the value is not too high, check whether this also happens if you disable one of the screen in nvidia settings

xrandr -q

this prints your screen setup, please post it

GPU temp is around 35-45C when this happens. I disabled one screen and this happened again (removed cable and disabled through settings).

Also, updaded nvidia driver but the problem continues.

So, what res do you run this on? (Even on one screen "xrandr -q")

What i can see on the photo reminds me of the result when trying to attach a WUXGA screen to an i810 chip

Btw, at least one screen is DVI, there's no DVI->VGA adapter inbetween?

luebking wrote:So, what res do you run this on? (Even on one screen "xrandr -q")

What i can see on the photo reminds me of the result when trying to attach a WUXGA screen to an i810 chip

Btw, at least one screen is DVI, there's no DVI->VGA adapter inbetween?

Yes one of them is DVI only using extension cable. I am using 1920 x 1200 res.

Actually problem seems to be solved. We removed nvidia driver and it worked! This was probably the driver.

check the output of "xrandr -q" on nouveau.
If you're *not* on WUXGA (1920x1200) you're using a single link DVI cable (or the output(s) of the card is wired to a single link connector)

(background: WUXGA on SLDVI is only supported with reduced blanking, what nouveau (did?) not support - and what also requires proper support of GPU and screen, thus might explain your issues)