I recently updated to 12.04 from 11.10 and the problem still existed
even with the 3.4 kernel.
Disabling ACPI solved the problem but then the CPUs were running at full speed.
As a Workaround I found this:
https://wiki.ubuntu.com/DebuggingACPI#Trouble_Booting
and booting with acpi=noirq worked for me.
$ uname -a
Linux Trifix 3.4.0-030400rc5-generic #201205011817 SMP Tue May 1 22:18:19 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux
top:
top - 12:28:01 up 21 min, 1 user, load average: 0.50, 0.40, 0.26
Tasks: 178 total, 1 running, 177 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3%us, 0.2%sy, 0.0%ni, 98.7%id, 0.8%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 6094080k total, 952640k used, 5141440k free,90032k buffers
Swap: 6269948k total,0k used, 6269948k free, 403796k cached
PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND
1998 alex 20 0 394m 11m 8304 S2 0.2 0:06.51 multiload-apple
2551 alex 20 0 742m 153m 35m S2 2.6 0:15.86 firefox
1 root 20 0 24432 2408 1352 S0 0.0 0:01.00 init
2 root 20 0 000 S0 0.0 0:00.00 kthreadd
3 root 20 0 000 S0 0.0 0:00.09 ksoftirqd/0
6 root RT 0 000 S0 0.0 0:00.00 migration/0
7 root RT 0 000 S0 0.0 0:00.00 watchdog/0
8 root RT 0 000 S0 0.0 0:00.00 migration/1
9 root 20 0 000 S0 0.0 0:00.10 kworker/1:0
10 root 20 0 000 S0 0.0 0:00.10 ksoftirqd/1
12 root RT 0 000 S0 0.0 0:00.00 watchdog/1
13 root RT 0 000 S0 0.0 0:00.00 migration/2
14 root 20 0 000 S0 0.0 0:00.00 kworker/2:0
15 root 20 0 000 S0 0.0 0:00.06 ksoftirqd/2
16 root RT 0 000 S0 0.0 0:00.00 watchdog/2
The Computer is a Lenovo Y560p.
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https://bugs.launchpad.net/bugs/717919
Title:
ACPI + kworker high interrupts.
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