The proprietary driver. Fglrx is installed together with ATI Catalyst Control Centre.
But I now have a temperature read for my GPU.
I had to run:
Did a restart and now
sudo aticonfig --initial -f
aticonfig --adapter=0 --od-gettemperature
And the fan command:
Adapter 0 - ATI Radeon HD 5700 Series
Sensor 0: Temperature - 33.50 C
aticonfig --pplib-cmd "get fanspeed 0"
So that seems to work now. Now I would like to see these reads also in lm-sensors.
Fan speed query:
Query Index: 0, Speed in percent
Result: Fan Speed: 35%