I am also experiencing the high cpu usage by Xorg process with the
following scenario:
1. Two X sessions with two users (A and B) logged in
2. High cpu usage is triggered on user A's Xorg in 10 minutes after switching
to user B
3. When switching back to user A, the cpu usage drops down
4. After 10 minutes user B's Xorg starts to use full cpu
This is a laptop with core duo. I suspect that the trigger for high cpu
usage is the timer for powering off or dimming the display or some other
powerdevil setting.
strace for the high cpu using Xorg gives something like this:
setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 0}}, NULL) = 0
clock_gettime(CLOCK_MONOTONIC, {94512, 5192525}) = 0
select(256, [1 3 7 9 11 12 13 19 20 21 22 23 24 25 26 27 28 30 31 32 33 34 35
36 37 38 39 40 41 42 43 44 45 46], NULL, NULL, {0, 0}) = 1 (in [46], left {0,
0})
clock_gettime(CLOCK_MONOTONIC, {94512, 5332906}) = 0
setitimer(ITIMER_REAL, {it_interval={0, 20000}, it_value={0, 20000}}, NULL) = 0
read(46,
"5\30\4\0Z\241\201\3\217\2\201\3j\0\24\0005\30\4\0[\241\201\3\217\2\201\3j\0\24\0"...,
4184) = 976
ioctl(8, 0x400c645f, 0xbf83a814) = 0
...
...
clock_gettime(CLOCK_MONOTONIC, {94512, 7638436}) = 0
ioctl(8, 0x400c645f, 0xbf839424) = 0
...
...
--
High Xorg CPU usage?
https://bugs.launchpad.net/bugs/449196
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