[HOWTO] Control automatic fan settings on XU3/XU4

[Tony32]

Hello guys,

so I've solved my problem with annoying sound:

Noctua 40x40x10
goo.gl/vEYWoH

Neat! I might try it out as well!

[TheGammel]

Hey guys,

so I already understood that with:

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echo 35000 > /sys/class/thermal/thermal_zone1/trip_point_0_temp

the fan speed can be somewhat affected.... And by adding that line to /etc/rc.local the setting can be made permanent.

However the fan still turns off from time to time... I would like it to run constantly at full speed...
How would I do that?

[mad_ady]

Try with 5000 instead of 35000 so that it stops in the unlikely event when the CPU reaches 5C

[TheGammel]

Try with 5000 instead of 35000 so that it stops in the unlikely event when the CPU reaches 5C

sadly this didn't do the trick for me... the fan kept turning off...

for me this did the trick: viewtopic.php?f=99&t=30675&p=220744#p220744

[odroid]

We made a WiKi page for controlling the fan behaviors.
https://wiki.odroid.com/odroid-xu4/appl ... ol_the_fan

Please review it and let's us know what's wrong or need to be improved.

[epierre]

Hello,

From wiki, I have the issue:

echo 0 | sudo tee /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic
tee: /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic: Permission denied

any idea why ?

XU4 running Linux odroid 4.14.5-92

[rooted]

Hello,

From wiki, I have the issue:

echo 0 | sudo tee /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic
tee: /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic: Permission denied

any idea why ?

XU4 running Linux odroid 4.14.5-92

What does this say?

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ls -l /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic 

And

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sudo ls

[odroid]

XU4 running Linux odroid 4.14.5-92

As described in the WiKi page, the kernel version must be higher than 4.14.32.
Update the system software first.

[korn16ftl3]

So I've skimmed the first page of this as a lot of it appears to be a touch beyond my skill level at this point, but my question is how would I make the CPU fan run full speed all the time right from start-up?

[minca]

So I've skimmed the first page of this as a lot of it appears to be a touch beyond my skill level at this point, but my question is how would I make the CPU fan run full speed all the time right from start-up?

Hi not sure if it is a good idea, as you will destroy the bearings and the cooler will get noisy.

[rooted]

So I've skimmed the first page of this as a lot of it appears to be a touch beyond my skill level at this point, but my question is how would I make the CPU fan run full speed all the time right from start-up?

Add to /etc/rc.local

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echo 15000 | tee /sys/class/thermal/thermal_zone1/trip_point_0_temp

[martouf]

i found the default fan settings too noisy and variable with my newly arrived XU4 running the 18.04 LTS image. i kept an eye on temps with EnergyMonitor. the RAM use by energymonitor started off at about 16MB and grew to over 280MB over 24 hours (see 'smem'). the fan seemed overactive even when the system is sitting completely idle or running a screensaver. it's fine the default cpu governor is 'performance', as it's a smoother GUI experience than 'ondemand'. i left the GPU thermal_zone4 alone for now. CPU runs in the upper-70s and the GPU rides along at 74C.

i've added the following to my /etc/rc.local (after the 1st and 2nd try "aafirstboot start" and before the "exit 0", of course!):

# adjust fan speeds from default "0 120 180 240"
# fan=0 to fan=120 is more jarring than transition from 70 to 120
# first speed would be 60 except for fan's own friction
echo "70 120 180 240" > /sys/devices/platform/pwm-fan/hwmon/hwmon0/fan_speed

# adjust lowest thermal trip points to reduce nearly constant fan speed 'breathing' at low system load
for i in $( ls /sys/devices/virtual/thermal/thermal_zone[0123]/*2_temp ); do echo 82000 > $i; done
for i in $( ls /sys/devices/virtual/thermal/thermal_zone[0123]/*1_temp ); do echo 75000 > $i; done
for i in $( ls /sys/devices/virtual/thermal/thermal_zone[0123]/*0_temp ); do echo 67000 > $i; done

ps: it was difficult to confirm these temperatures would not prove adverse to long-term use! there does not seem to be much literature nor specifications generally available. this report was helpful: https://www.bu.edu/peaclab/files/2016/1 ... _sahin.pdf

[moon.linux]

Nice pdf report but some other issue need to be fixed so that this board work efficiently.

[minca]

just noticed that on Ubuntu 18.04.1 LTS (Linux kurwitko 4.14.73-149) - the ./fanwrite.sh doesn't work anymore...
only whats working, it set the fan permanently to 120 RMP. (got like 42 degrees)..can't set it higher...
any tips ?

EDIT: got it
with

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echo 120 | sudo tee /sys/devices/platform/pwm-fan/hwmon/hwmon0/pwm1