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 installed 12.10 32bit. It is going well. Some little issues, but just normal for a recent version. The problem that is really boring me and I can't find the solution is that my desktop is frequently getting dark. All the windows, the wallpaper and the top bar are getting dark. But not the Unity bar. It is like when a programs is not working. I can't predict when but it happens every day. If I close and reopen some program, it gets normal. But only this one, not the others. The only solution is restart Ubuntu.

Somebody has the same problem? Any tip?

share|improve this question

The first thing to do is find out what program or programs are using most of the cpu. I run top in command line in these cases and the solution usually suggests itself once you know what is going on.

I also run Gkrellm on my desktop to keep tabs on the health of the OS and it usually gives a heads-up when something is not playing nice. Gkrellm is installable from the repositories and is very configurable, and uses krells as well as bar graphs. Some people like Conky because it can be made to look pretty, but Gkrellm with default theme is very functional:

Gkrellm sample

I particularly like how Gkrellm uses different colours for the CPU graph - brown for system, blue for user, and green for applications with very high nice levels (usually daemons that use a lot of CPU but give it back when system or user programs need it.) Also, disk, memory, and network reads are in blue while writes are in brown. Neat.

I have noticed on my new 12.10 64 bit install that Firefox has been hogging the CPU on occasion, but I will be installing 32 bit on this faster dual core machine to see if the problem persists.

I've also noticed that 12.10 has higher memory requirements than previous versions - about 712 Mb for 12.10 64 bit with Firefox, Transmission and a terminal window running. Gkrellm can keep tabs on memory and cache for you as well, or type 'free' on the command line.

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.