[BUG] "Auto" fan speed not working on Blade 15 Base (2020)

[5p4k]

Describe the bug
After setting the fans to a custom rpm (e.g. razer-cli write fan 4200), it is not possible to return to the "auto" setting.
The command razer-cli write fan 0 succeeds, but the fan speed stays the same (e.g. 4200 rpm)

To Reproduce

❯ razer-cli write fan 4200
RES: SetFanSpeed { result: true }
RES: GetFanSpeed { rpm: 4200 }
Current fan setting: 4200 RPM
❯ razer-cli write fan 0
RES: SetFanSpeed { result: true }
RES: GetFanSpeed { rpm: 0 }
Current fan setting: Auto (0)
❯ razer-cli read fan
RES: GetFanSpeed { rpm: 0 }
Current fan setting: Auto (0)

Expected behavior
Throttle down the fan (there is no load and temperature is low).

Optional but useful, packet capture from synapse
I cycled through several values in Synapse before setting back to auto.
Also, Synapse allows many different speeds even below the 3500 rpm limit adopted by razer-cli.

ChangeFanSpeed.pcapng.zip

I hope the packet capture is correct.

[TANZMUSIK]

Hey,

the problem also appears with Early RB Adv 2019. You can set from auto to 5200, but if you switch back to 0 it wont do anything. However I'm able to lower it to 3500. But thats the pure minimum.

Im running Linux and Windows in dual boot... dunno if thats something (because before that i hadnt had this problem).

[EyeOfCat]

Hello,
Same problem with Blade 15 Adv 2019mid.

And I believe, that it was working once, but someday stopped and also bug with keyboard backlit appeared. May be new kernel versions.

Workaround to turn auto mode after manually adjusting fans:
with razer_cli
switch to power mode
switch fan speed to auto (0)
switch to balanced mode

[gorghino]

It happens with my Razer Adv Early 2020.
I confirm setting fan to auto (0) and then setting a different power mode, resets the fan to auto.

[shizonic]

Exactly the same like @gorghino for Razer Blade 14 2021.