Upon some advices received on the forum, I decided to change my graphic card.
With the new graphic card, the problem is not occuring anymore. -- Xorg takes all the CPU on some trivial tasks https://bugs.launchpad.net/bugs/652779 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs