I've noticed this problem as well (with the radeon and intel drivers on separate machines). My impression is that the GtkProgressbar widget is causing the excessive CPU usage (at least during the installation of updates).
-- Update Manager causes high Xorg CPU usage when checking for updates https://bugs.launchpad.net/bugs/355355 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
