Hi Board,
I have a Dell Precision M6400 laptop with an Intel Core2 Duo 2.8 GHz processor.
I have set Power Management to performance when on AC power and have also written a script that calls cpufreq-set to set the lower and upper limits to 2.80 GHz (cpufreq-info output below).
However, sometimes when doing some heavy work the frequency suddenly gets reduced to 1.60 GHz on both cores and I cannot set them back to 2.80 GHz using the script (cpufreq-set says errors occurred). Performance is then totally gone and I have to reboot. The same script then works fine after a reboot.
What is setting the lower limit back down to 1.60 GHz even though I set it to 2.80 GHz using my script? How can I stop/configure this or prevent it from happening?
Many thanks!
cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
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analyzing CPU 0:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 0
hardware limits: 1.60 GHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.13 GHz, 1.60 GHz
available cpufreq governors: conservative, userspace, powersave, ondemand, performance
current policy: frequency should be within 2.80 GHz and 2.80 GHz.
The governor “performance” may decide which speed to use
within this range.
current CPU frequency is 2.80 GHz.
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 1
hardware limits: 1.60 GHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.13 GHz, 1.60 GHz
available cpufreq governors: conservative, userspace, powersave, ondemand, performance
current policy: frequency should be within 2.80 GHz and 2.80 GHz.
The governor “performance” may decide which speed to use
within this range.
current CPU frequency is 2.80 GHz.