Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am running Ubuntu 10.10 with a Intel 945GME Express Integrated Graphics Controller (rev 03) and I cannot use Visual Effects when I have both monitors turned on.

When I use the Visual Effects control to change it back to Normal or Extra the screens flicker and the checkbox stays on what I selected, but it doesn't actually activate, and when I re-open the dialog, it's back on None.

Is it just that my video card can't handle it, or is there a bug here that needs fixing?

share|improve this question
up vote 2 down vote accepted

Strange as it looks try to configure the monitor one above the other in the Monitor app, not side by side: ie.

enter image description here

Some low-end graphic cards has a limit on the biggest textures that they can show 2048x2048. If the combined horizontal resolution of both monitors is bigger than 2048 (quite easy with one at 1280xn and the other at 1024) they will not fit on a single texture and Compiz will refuse to work.

But if you put them horizontally they will fit, as usually vertical resolution is not greater than 1024.

share|improve this answer

It is most likely a bug in the intel drivers, triggering a crash in compiz. You could install compiz-config and see if the screens option under "general" lists multiple outputs.

In any case, I would suggest reporting a bug on launchpad. (see this link).

share|improve this answer
I've submitted a bug at We'll see how it goes. – David Dean Dec 1 '10 at 0:46
Also, compiz-config does list multiple outputs – David Dean Dec 1 '10 at 0:47
ahh... it's most likely a driver bug then. – RolandiXor Dec 1 '10 at 4:48

I have the same controller, running Debian based eeebuntu 4 and had same problem. Just found this thread: How to set default xrandr settings?. Sure enough, restarted compiz and effects work normally (well, slight expo problem, but mostly ok).

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.