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pyamsoft / pstate-frequency

Easily control Intel p-state driver on Linux
https://pyamsoft.blogspot.com/
GNU General Public License v2.0
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Permission error in /sys/devices/system/cpu/cpufreq/boost #29

Closed diegobersanetti closed 7 years ago

diegobersanetti commented 7 years ago

Hello, I updated pstate-frequency to the last version 3.7.0; now when I manually change the policy, for example with the command

sudo /path/pstate-frequency -S -g powersave -t off

I receive the following error:

/path/pstate-frequency: 1303: /path/pstate-frequency: cannot create /sys/devices/system/cpu/cpufreq/boost: Permission denied

I looked into that folder, and there is no 'boost' directory, nor I can create it even with sudo.

I am on Ubuntu 16.04, with an Haswell processor and the intel_pstate governor. I did not install service units, nor udev rules, I just run pstate-frequency manually because to change settings on the fly, the automatic switch w.r.t. battery state is done by TLP.

Regards,

Diego

ozky commented 7 years ago

Seems to be sudo problem as in Mageia 6 it works with full root permission out of box. Have you try to use sudo -i in terminal ? it will give root priviledges and then try to call pstate command. [root@ozky-pc ~]# pstate-frequency -S -g powersave -t off pstate-frequency version 3.6.3 pstate::CPU_DRIVER -> intel_pstate pstate::CPU_GOVERNOR -> powersave pstate::TURBO -> 1 [OFF] pstate::CPU_MIN -> 19% [499800KHz] pstate::CPU_MAX -> 100% [2582300KHz]

diegobersanetti commented 7 years ago

Unfortunately nothing changes...

I noticed "cpufreq" in the path of the error, which seems weird to me as I'm not using cpufreq as governor... Moreover, looking at the '/sys/devices/system/cpu/cpufreq' folder, the only folders in there are 'policy0' to 'policy7'

pyamsoft commented 7 years ago

Hi there, sorry to hear of the issue you're experiencing. Never seen this one myself personally, but let's get to the root of it.

Please tell me the following: Kernel version Whether you are using acpi-cpufreq or intel_pstate

Try using the very recently released 3.7.1 version and let me know if that fixes your issue. Thanks!

diegobersanetti commented 7 years ago

Hello, I tried the new version 3.7.1 and the problem went away, thank you!

I use Ubuntu 16.04.1 with kernel 4.4.0-53-generic, and intel_pstate; now pstate-frequency finds the right place for the boost information!

Thanks again for the fix and your work on pstate-frequency!

Diego

pyamsoft commented 7 years ago

Thank you for the report.

I will close this ticket as the issue has been resolved.