I’ve checked. Hardware is working perfect. It works starting from about 60 and up to 255.
At the moment of overheating
cat /sys/kernel/debug/tegra_fan/target_pwm
returns 0
I think , it is a problem of broken software thermal control system, but I don’t know why…
Again, I can see it on the same hardware. (I have several Jetsons)
The fresh system made by JetPack 2.1 is Ok. (but once it was broken after some weeks, I cannot guarantee that our experiments had no effect on it…)
Now I have a fresh system made by JetPack 2.2.1 and cannot see thermal control.
Fan works well…
How can I check a thermal sensor?
Somewhere in sysfs?
I have almost found that the reason of a strange behavoir of the thermal control loop.
After I changed a kernel config the problem had disappeared.
Perhaps some debug option affects on it.
Some composition of kernel debug options in the kernel config paralyzes thermal control loop. I’m still trying to minimize quantity of possible reasons. But at least I have kernel config with working and unstable thermal subsystem.
More interesting thing. Currently I’m debugging PCIe DMA. I have a data source in PCIe device and draw it in simple OpenGL app. App just transfers data to the texture on OpenGL context, it requires low CPU load.
Unlike Particles sample app, my test app loads I’d say only GPU. Fan is not working!
I mean, on the same system with the same kernel and DT Particles sample app causes the fan to start working, but app that only draws DMA data not.
Hi Corvus
Could you try Jepack 2.3.2 for the TX1 JetPack 2.3.2 should have no with different JetPack 3.0 , and I just try the 2.3.2 fan can control by the /sys/kernel/debug/tegra_fan
Thanks for the reply. The issue seems to be with the breakout board. I have the module running on an Auvidea J120, where as previously I had it running on the Jetson Developer kit.
Apparently the fan is connected differently on the J120 and the PWM-fan module doesn’t seem to detect it properly, so the entry in /sys/kernel/debug/tegra-fan is missing.
I have the same issue with both JetPack2.3.1 and 3.0
I have contacted Auvidea for support or an updated .dtb, but have’t gotten an answer yet. My workaround was to put a different always-on FAN for the meantime that’s directly hooked up to supply power for now.
With the Jetson dev kit everything seems to be working fine.