[Nouveau] pstate changing

[Алексей Губский]

Greetings!
I have very old notebook with 8400M Gs.
And I'm experience some overheating on high clocks. I want to change pstate
for AC mode.
Currently I have
sudo cat /sys/kernel/debug/dri/0/pstate
20: core 169 MHz shader 338 MHz memory 100 MHz
21: core 275 MHz shader 550 MHz memory 200 MHz
22: core 400 MHz shader 800 MHz memory 400 MHz
AC: core 275 MHz shader 550 MHz memory 199 MHz

And I want to set AC to 20 instead of 21.
Could you please give me some advise how can I do this?
I'm running lubuntu 18.04

uname -a
Linux tashpc 4.15.0-33-generic #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
Thanks!

-- 
С уважением,
Губский Алексей.
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