It's still confirmed. I created a strace dump from the process 'X'. When I accidently sent the strace output to the terminal, the complete system hangup. No log messages about it, no capslock led it just gets locked.
When I using X, for example changing windows, this process shows high cpu usage:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1301 root 20 0 183m 20m 8220 R 59 0.4 3:46.29 Xorg
1790 tompos 20 0 693m 106m 25m S 5 1.8 0:28.43 compiz
1925 tompos 20 0 367m 19m 10m S 1 0.3 0:07.81 gnome-terminal
11123 tompos 20 0 751m 187m 36m S 1 3.2 0:27.97 firefox
1761 tompos 20 0 26972 2888 856 S 0 0.0 0:02.25 dbus-daemon
11058 root 20 0 17208 1364 956 S 0 0.0 0:03.04 top
11075 tompos 20 0 1169m 378m 36m S 0 6.5 0:29.39 thunderbird-bin
11195 root 20 0 0 0 0 R 0 0.0 0:00.03 kworker/0:1
11201 root 20 0 17208 1352 956 R 0 0.0 0:00.78 top
11206 root 20 0 0 0 0 S 0 0.0 0:00.03 kworker/3:2
1 root 20 0 24176 2228 1340 S 0 0.0 0:01.00 init
2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0 0.0 0:00.12 ksoftirqd/0
6 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0
7 root RT 0 0 0 0 S 0 0.0 0:00.01 watchdog/0
** Attachment added: "strace dump from the process 'X'"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/899943/+attachment/2640911/+files/log.1301
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/899943
Title:
desktp clogs if KMS is enabled
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