Many thanks!!! Does this quite mode also work for bios 0.25? I wouldn’t have upgraded from 0.24 if I read your post earlier. 
where have you got bios 0.25 from ?
I contacted GPD about the included bios 25 bin in the new windows firmware and was advised by Kendyz they had not released bios 0.25 for public use?
That’s… annoying. They did release it for public use by including it in that ‘firmware’ image.
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I am using BIOS 0.25 and didn’t face any issues so far. In facts some of the boot up issues have been resolved.
I created a python version of the ec_control using portio lib and made it a long-running process that can be started with systemd as a simple type. In contrast to the rest of you I couldn’t get reliable fan speeds (I’m on BIOS 0.29) using the values metioned in earlier posts so I used 0x09 0xf9 and 0xfb for off/mid/high. Adjust values as you see fit for your device and let me know if this was helpful for you 
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Register 0x71 also has erratic high values sometimes so I wrote a quick and dirty fix : does your fan sometimes loudly turn on ? here might be a quick (and dirty) fix · Issue #2 · casainho/GPD_P2_Max-Linux_tweaks · GitHub , so that the fan would not loudly turn on for no reason sometimes …
… thanks for the script by the way !! 
(my Fan is mostly silent now … btw before the script I felt that the fan was normally a little bit loud (probably on LEVEL_2 ?) but fan on LEVEL_1 is almost inaudible and already does quite a good job at cooling the P2 MAX for normal non demanding use cases …)