hello, i have the same problem on an acer extensa notebook, putting a disc in the cdrom also works for me.
top with empty cdrom-drive:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
13640 root 20 0 5048 2172 1676 S 9.3 0.1 31:10.03 devkit-disks-da
14338 a 20 0 57648 23m 2012 S 8.6 1.2 29:23.67 gvfs-gdu-volume
7667 messageb 20 0 3372 1744 840 S 7.3 0.1 25:44.88 dbus-daemon
13548 a 20 0 49676 12m 4172 S 5.3 0.6 17:32.29 update-notifier
13616 a 20 0 28644 8828 1296 S 4.6 0.4 14:08.35 gdu-notificatio
28801 root 18 -2 2348 600 284 R 3.3 0.0 0:31.26 udevd
8654 root 20 0 141m 62m 26m S 1.7 3.2 4:11.26 Xorg
525 root 20 0 2148 556 416 S 1.3 0.0 5:32.26 upstart-udev-br
top 2 seconds after inserting cd into drive:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
8654 root 20 0 141m 62m 26m S 2.0 3.2 4:14.98 Xorg
13949 a 20 0 340m 108m 14m S 1.0 5.6 6:25.10 firefox-bin
604 root 20 0 2468 1184 884 R 0.3 0.1 0:00.02 top
10016 a 20 0 58240 8260 4976 S 0.3 0.4 0:01.85 gnome-terminal
13024 a 20 0 144m 15m 2344 S 0.3 0.8 0:32.45 compiz.real
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High cpu usage after upgrade to 141-1.1
https://bugs.launchpad.net/bugs/379780
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