Romain, I'd sas that for additional troubleshooting the issue the following article may give you some hints: http://linoxide.com/how-tos/cpu-bottleneck-linux/
You should have the following packages installed: procps and sysstat. First, maximize the terminal window. Then run vmstat and mpstat for a while to see CPU usage, e.g.: $ vmstat 2 5 $ mpstat 2 5 If you see high %irq you can use the following command to find out which interrupt number is the culprit: $ sar -I XALL 2 1 | less And the following command shows the recorded number of interrupts per CPU per IO device: $ cat /proc/interrupts which is useful to find out which IO device uses the interrupt (see more in proc(5) man page). -- rpr. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/657990 Title: System freeze when i'am not moving the mouse or typing. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/657990/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
