Dennis and Peter 

Thank you, your solutions worked.  The kernel module pwm_fan is loaded.
 I wrote 110 to the pwm1 file and the fan started. I was able to
modulate the fan speed up to 255. 

Aaron

On Tue, 2021-12-07 at 07:12 -0600, Dennis Gilmore wrote:
> Try running "echo 110 > /sys/class/hwmon/hwmon1/pwm1" then bump it
> back to 255 I have found that to work on a different rockchip based
> device
> 
> Dennis
> 
> On Tue, Dec 7, 2021, 05:30 Peter Robinson <[email protected]>
> wrote:
> > > The fan on my Rockpro64 does not work with fedora 34 installed. 
> > The
> > > file /sys/class/hwmon/hwmon1/pwm1 has the value 255. All the
> > solution I
> > > have found were for Debian/Ubuntu and require installing
> > firmware.
> > 
> > All the pieces should be upstream, is the pwm-fan module loaded?
> > 
> > P
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