I'm successfully using the open source radeon driver and use KMS-power_profiles (see link below) for power management of my graphics to prevent overheating. But I can't manage to set the power_profile on boot and retain it after suspend - so I have to do it manually every time I start up or wake up my laptop.
Several questions about setting it at boot were posed at askubuntu and elsewhere and I've tried every way described without success. I'm new to (Ubuntu) Linux but believe I followed the instructions correctly. Since I cannot comment on the answers as a new users and hours of research on the web didn't help I'm posting this as a new question. Please help :)
I'm using: ATI Mobility Radeon HD 4250 (family R600) on Ubuntu 12.04 x64 with Gallium 0.4 on AMD RS880 = the default open source driver, that came with the installation.
The method most often described is putting
echo profile > /sys/class/drm/card0/device/power_method echo low > /sys/class/drm/card0/device/power_profile
After doing this I can prove that rc.local is being executed (inserted a command to create a directory which worked), but
high instead of
Again, setting the
power_profile manually as root (even executing rc.local directly) does work. But even then the setting is reverted to
high after waking up from suspend.
Other ways I've tried without success:
- installing the sysfsutils package and adding a rule to the
- putting a script in
Is there any reason you could think of that prevents setting radeon power_profile from boot and retaining it after suspend? Could there be another process overriding my settings?
Thank you for your help!
P.S. I don't want to use the proprietary driver for power-management because it brings along other severe problems.
- X.org reference for KMS power management
- How to set power_profile at boot
- Tweaks and configuration for Radeon Open Source driver
- Gnome 3 Ati Fan always on
- Ubuntu open source ATI radeon driver power usage tweaks