I re-installed my system to see on which update step this bug arrives.
It comes after upgrading system from Kubuntu backports ppa.
Steps to reproduce (exactly what I did):
1. Clean install Kubuntu 12.04.3.
2. Update kernel to 3.8:
sudo apt-get install --install-recommends
Yes.
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https://bugs.launchpad.net/bugs/1240376
Title:
Plymouthd constantly using 5% of CPU time
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Public bug reported:
On fresh install of Kubuntu 12.04.3, a process named plymouthd always
using 5% of CPU on working system, even after login. I asked this
question on AskUbuntu, they recommends me to report a bug.
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -
About
Forgot to mention in report, I used Kubuntu backports ppa to update KDE
on my installation.
I changed 'start' rule in /etc/init/kdm.conf to:
start on ((filesystem
and runlevel [!06]
and started dbus
and plymouth-ready
and (drm-device-added card0
That is not what I said to change it to.
Ok, changed 'start' rule to exactly match Your variant, plymouthd is
still here and eating CPU time.
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Also on my system:
$ uname -a
Linux MAXX-X6 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:18:20 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep powernow
[2.098891] powernow-k8: Found 1 AMD Phenom(tm) II X6 1045T Processor (6 cpu
cores) (version 2.20.00)
[2.098909] powernow-k8:
I found some info on this.
To fix this issue you should use acpi_cpufreq cpu driver instead of
powernow-* for AMD K10+ (Phenom II, Athlon II, FX CPUs).
acpi_cpufreq supports TurboCore, but powernow-* seems not.
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Bugs,
This is for powernow:
$ cpupower frequency-info
analyzing CPU 0:
driver: powernow-k8
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 8.0 us.
hardware limits: 800 MHz - 2.70 GHz
available
cpupower for ubuntu is in this ppa:
https://launchpad.net/~kamalmostafa/+archive/cpupower.
Also can you test if the system is really switching to 3200 MHz on high cpu
load?
Just get only one core to use 100% of cpu power and post the output
of cat /proc/cpuinfo | grep MHz here.
I ran this
