Bash script for changing cpu minimal frequency OPERATION NOT PERMITTED
By Jessica Wood •
I wrote a script to set the minimum cpu frequency in the bash, looks like this:
#!/bin/bash
echo -n "Processor min-freq"
echo -n Zadej minimální frekvenci procesoru
read val
echo $val > /sys/devices/system/cpu/cpu0/cpufreq/scalling_min_freq
echo $val > /sys/devices/system/cpu/cpu1/cpufreq/scalling_min_freq
echo $val > /sys/devices/system/cpu/cpu2/cpufreq/scalling_min_freq
echo $val > /sys/devices/system/cpu/cpu3/cpufreq/scalling_min_freq
echo $val > /sys/devices/system/cpu/cpu4/cpufreq/scalling_min_freq
echo $val > /sys/devices/system/cpu/cpu5/cpufreq/scalling_min_freq
echo "all done"but it does not work, this is the output from the terminal:
gandalf@gandalf-MS-7693 ~ $ sudo -s
gandalf-MS-7693 ~ # '/home/gandalf/Plocha/procesor-min-freq.sh'
Processor min-freqZadej minimální frekvenci procesoru1500000
/home/gandalf/Plocha/procesor-min-freq.sh: řádek 5: /sys/devices/system/cpu/cpu0/cpufreq/scalling_min_freq: Operation not permitted
/home/gandalf/Plocha/procesor-min-freq.sh: řádek 6: /sys/devices/system/cpu/cpu1/cpufreq/scalling_min_freq: Operation not permitted
/home/gandalf/Plocha/procesor-min-freq.sh: řádek 7: /sys/devices/system/cpu/cpu2/cpufreq/scalling_min_freq: Operation not permitted
/home/gandalf/Plocha/procesor-min-freq.sh: řádek 8: /sys/devices/system/cpu/cpu3/cpufreq/scalling_min_freq: Operation not permitted
/home/gandalf/Plocha/procesor-min-freq.sh: řádek 9: /sys/devices/system/cpu/cpu4/cpufreq/scalling_min_freq: Operation not permitted
/home/gandalf/Plocha/procesor-min-freq.sh: řádek 10: /sys/devices/system/cpu/cpu5/cpufreq/scalling_min_freq: Operation not permitted
all done
gandalf-MS-7693 ~ # Do you have any ideas? I will be great for the solution
2 Answers
Fixed, cause found in file: /etc/cpufreqd.confI rewrote the profile frequency: Performance High, originally there was:
[Profile] Name = Performance High Minfreq = 100% Maxfreq = 100% Policy = performance # Exec_post = echo 8> / proc / acpi / sony / brightness [/ Profile]
After replacing:
[Profile] Name = Performance High Minfreq = 0% Maxfreq = 100% Policy = performance # Exec_post = echo 8> / proc / acpi / sony / brightness [/ Profile]
It is after the problem, parade :)
Under the assumption that you are using the intel p-state governors, execute the command
sudo cpupower frequency-set -d 1500kHz
If you are not using intel_pstate, then
sudo apt install cpufrequtils
will download a set of utilities, and
sudo cpufreq-set -d 1500kHz
will set the minimum frequency
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