[Solved] No odroid_fan.13 file in fresh installation

[TheGammel]

Hey guys, I am using Ubuntu 16.04.3 with the 4.14 Kernel.

I downloaded the fresh image and put it onto the SD card with rufus. Then I wanted to change the fan speed to 100% with this guide: viewtopic.php?f=52&t=16308

However there is no such file as odroid_fan.13 or *.14....

Did the location change?

[odroid]

Fan control method has changed in Kernel 4.x
Look into the second page of the guide link.

[TheGammel]

Ok thx! I didn't realize, that this was such a mega-thread...

So after some time I found this:

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echo 35000 > /sys/class/thermal/thermal_zone1/trip_point_0_temp
echo 35000 > /sys/class/thermal/thermal_zone2/trip_point_0_temp
echo 35000 > /sys/class/thermal/thermal_zone3/trip_point_0_temp
echo 35000 > /sys/class/thermal/thermal_zone4/trip_point_0_temp

But where can I see to which speed that trip_point_0_temp corresponds to?


EDIT

I basically want to run the fan at 100% all the time...

[DarkBahamut]

If your kernel version is 4.14.20 or higher and you want to run the fan at 100% all the time then do:

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echo 0 > /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic
echo 255 > /sys/devices/platform/pwm-fan/hwmon/hwmon0/pwm1

No longer any need to edit the trip points

[TheGammel]

ok... that seems reasonable...
first shut off automatic speeds and then 100%...

but it outputs this error for both commands:

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-bash: /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic: Permission denied

[DarkBahamut]

You'll need to sudo them probably.

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echo 0 | sudo tee /sys/devices/platform/pwm-fan/hwmon/hwmon0/automatic
echo 255 | sudo tee /sys/devices/platform/pwm-fan/hwmon/hwmon0/pwm1

[TheGammel]

Well I performed the above command as root...

Your command does not work either. I wonder what is going on...

[DarkBahamut]

What kernel version are you running?

[TheGammel]

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root@huxley:~# cat /proc/version
Linux version 4.14.5-92 (root@1604_builder_armhf) (gcc version 5.4.1 20160904 (Ubuntu/Linaro 5.4.1-2ubuntu1~16.04)) #1 SMP PREEMPT Mon Dec 11 15:48:15 UTC 2017

[odroid]

Update the kernel first. The latest version should be 4.14.32 probably.
https://wiki.odroid.com/odroid-xu4/os_i ... st-upgrade

[TheGammel]

Ok done and it works...

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root@huxley:~# cat /proc/version
Linux version 4.14.32-126 (root@1604_builder_armhf) (gcc version 5.4.1 20160904 (Ubuntu/Linaro 5.4.1-2ubuntu1~16.04)) #1 SMP PREEMPT Wed Apr 4 03:59:40 UTC 2018

I have no idea why a simple kernel update fixed it though... THANK YOU!

For Future Reference:

set fan to manual:

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

set speed to 100%:

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echo 255 | sudo tee /sys/devices/platform/pwm-fan/hwmon/hwmon0/pwm1

get temperature:

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cat /sys/devices/virtual/thermal/thermal_zone0/temp

[rooted]

Or you can do this:

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echo 90000 | sudo tee /sys/devices/virtual/thermal/thermal_zone0/emul_temp

To go back to normal

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echo 0 | sudo tee /sys/devices/virtual/thermal/thermal_zone0/emul_temp

[mad_ady]

Wouldn't that start triggering (or prevent from triggering) the cpu overheat protection as well?

[rooted]

Wouldn't that start triggering (or prevent from triggering) the cpu overheat protection as well?

Maybe, I just use it to manually cool down my device. If you echo higher than the third trip point it shuts down.