I have a NVidia GTX 580 running under nouveau. It is currently running at
03 (the lowest state). However, when I try to change the clock rate to any setting, including the original state
03, it fails.
This is what happens (run as root in the /sys/kernel/debug/dri/1 directory)
$ echo 0f > pstate bash: echo: write error: Function not implemented
I am running Debian GNU/Linux 4.9.0-1-amd64 (sid)