System information

150 System Analysis and Tuning Guide
3 Edit the settings in /etc/pm-profiler/testprofile/config and save
the file. You can also remove variables that you do not need—they will be handled
like empty variables, the settings will not be touched at all.
4 Edit /etc/pm-profiler.conf. The PM_PROFILER_PROFILE variable
defines which profile will be activated on system start. If it has no value, the de-
fault system or kernel settings will be used. To set the newly created profile:
PM_PROFILER_PROFILE="testprofile"
The profile name you enter here must match the name you used in the path to the
profile configuration file (/etc/pm-profiler/testprofile/config),
not necessarily the NAME you used for the profile in the /etc/pm-profil
er/testprofile/config.
5 To activate the profile, run
rcpm-profiler start
or
/usr/lib/pm-profiler/enable-profile testprofile
Though you have to manually create or modify a profile by editing the respective pro-
file configuration file, you can use YaST to switch between different profiles. Start
YaST and select System > Power Management to open the Power Management Settings.
Alternatively, become root and execute yast2 power-management on a com-
mand line. The drop-down list shows the available profiles. Default means that the
system default settings will be kept. Select the profile to use and click Finish.
11.6 Troubleshooting
BIOS options enabled?
In order to make use of C-states or P-states, check your BIOS options:
• To use C-states, make sure to enable CPU C State or similar options to
benefit from power savings at idle.
• To use P-states and the CPUfreq governors, make sure to enable
Processor Performance States options or similar.