I am trying to follow this tutorial: https://gist.github.com/Francesco149/0302fbb5e056f3339ae17d3c13257929

  • The first step is to run sudo su to switch to root. Done that.
  • The second step is to run

    echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
  • So I ran it, and here's what I got:

    bash: /sys/class/drm/card0/device/power_dpm_force_performance_level: Permission denied

Permission denied?! How is that and I am the root user? How is it possible?

I have no idea of the inputs you would need from me, so please tell me and I will reply to you asap.


Here is the output of echo high | sudo tee /sys/class/drm/card0/device/power_dpm_force_performance_leve‌​l (running as root):

tee: /sys/class/drm/card0/device/power_dpm_force_performance_leve‌​l: Permission denied 

output of echo high | sudo tee /sys/class/drm/card0/device/power_dpm_force_performance_leve‌​l

  • Did you try echo high | sudo tee /sys/class/drm/card0/device/power_dpm_force_performance_level instead? This should not be different, but who knows… – dessert Aug 23 '17 at 19:57
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    @Ravexina Actually OP did sudo su before executing the command. – dessert Aug 23 '17 at 21:10
  • Then the entry might be protected, even if you write something there in will be overwritten by Kernel. – Ravexina Aug 23 '17 at 21:32
  • @dessert with sudo tee I get this: tee: /sys/class/drm/card0/device/power_dpm_force_performance_leve‌​l: Permission denied high – Tooniis Aug 24 '17 at 3:34

In: /sys/class/drm/cardX/device

$ cat power_dpm_force_performance_level

$ echo manual > power_dpm_force_performance_level

$ cat power_dpm_force_performance_level 

$ cat power_dpm_state 

$ echo performance > power_dpm_state 

$ cat power_dpm_state 
  • Permission denied. That's my problem. – Tooniis Dec 21 '17 at 14:25

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