1. how can I enable the power management for my ati GPU? I found this guide in the internet but it does not work for me.
Important notice: I want to keep my installation for years. I want a method supported by the developers which do not cause me trouble after updates and continue to work for years in this rolling release distro.
when I su in a terminal and run
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echo dynpm > /sys/class/drm/card0/device/power_method
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bash: /sys/class/drm/card0/device/power_method: No such file or directory
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echo profile > /sys/class/drm/card0/device/power_method
bash: /sys/class/drm/card0/device/power_method: No such file or directory
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echo low > /sys/class/drm/card0/device/power_profile
bash: /sys/class/drm/card0/device/power_profile: No such file or directory
3. Is xserver-xorg-video-radeon is my GPU driver?