Good morning everyone. I have recently installed Ubuntu 14.04 LTS (Fresh release) and I wanted to give a serious try to the radeon drivers (AMD 280X). One thing I noticed for the OSS drivers compared to the Catalyst ones is that the fan speed is high at all times. According to most documentation online, I should be able to change settings related to it by

# echo battery > /sys/class/drm/card0/device/power_dpm_state
# echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level

But both return to me

No such file or directory

If I do a dmseg|grep radeon I can see the dpm is active

[   12.624293] [drm] radeon: dpm initialized

What am I doing wrong? Can anyone help? Thank you!


I found the answer. Since I have a iGPU, the device was card1 and not card0. Hence why I couldn't change the power related files.


AMD does release a driver of its own. You can download the driver from AMD, but be warned, when a release of Linux kernel is updated, it'll crash your X server (GUI process), at least for Ubuntu. I have Radeon HD8970m, and once I faced it.

  • The fan speeds work correctly with fglrx (AMD closed source drivers) but I prefered the Open source ones since they are more stable, but the only problem I have with them are just the fan speed when in 2D mode, which, are quite high. – luz_andre May 7 '14 at 10:17
  • Okay. Sorry for didn't get you right in the first place. Well, good luck on your discovery. – user220402 May 7 '14 at 10:25

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