I’m getting started with a NVIDIA Orin Jetson-Small Developer Kit (Jetpack 5.0 PRE-DP [L4T 34.0.1]) still rather early in the setup process and noticed that it provides out of the box 10 thermal zones
pseyfert@orin-1:~$ ls /sys/devices/virtual/thermal/thermal_zone*/temp
/sys/devices/virtual/thermal/thermal_zone0/temp /sys/devices/virtual/thermal/thermal_zone5/temp
/sys/devices/virtual/thermal/thermal_zone1/temp /sys/devices/virtual/thermal/thermal_zone6/temp
/sys/devices/virtual/thermal/thermal_zone2/temp /sys/devices/virtual/thermal/thermal_zone7/temp
/sys/devices/virtual/thermal/thermal_zone3/temp /sys/devices/virtual/thermal/thermal_zone8/temp
/sys/devices/virtual/thermal/thermal_zone4/temp /sys/devices/virtual/thermal/thermal_zone9/temp
Though browsing through them, there seems to be something wrong with zone 8
pseyfert@orin-1:~$ cat /sys/devices/virtual/thermal/thermal_zone8/temp
cat: /sys/devices/virtual/thermal/thermal_zone8/temp: Invalid argument
The entry is related to the tj-therm zone (from the type in the same dir)
pseyfert@orin-1:~$ for f in /sys/devices/virtual/thermal/thermal_zone8/* ; do echo $f ; sudo cat $f ; echo ; done
/sys/devices/virtual/thermal/thermal_zone8/available_policies
[sudo] password for pseyfert:
pid_thermal_gov power_allocator step_wise
/sys/devices/virtual/thermal/thermal_zone8/emul_temp
cat: /sys/devices/virtual/thermal/thermal_zone8/emul_temp: Permission denied
/sys/devices/virtual/thermal/thermal_zone8/integral_cutoff
0
/sys/devices/virtual/thermal/thermal_zone8/k_d
0
/sys/devices/virtual/thermal/thermal_zone8/k_i
0
/sys/devices/virtual/thermal/thermal_zone8/k_po
0
/sys/devices/virtual/thermal/thermal_zone8/k_pu
0
/sys/devices/virtual/thermal/thermal_zone8/mode
disabled
/sys/devices/virtual/thermal/thermal_zone8/offset
0
/sys/devices/virtual/thermal/thermal_zone8/passive
0
/sys/devices/virtual/thermal/thermal_zone8/passive_delay
1000
/sys/devices/virtual/thermal/thermal_zone8/policy
step_wise
/sys/devices/virtual/thermal/thermal_zone8/polling_delay
0
/sys/devices/virtual/thermal/thermal_zone8/power
cat: /sys/devices/virtual/thermal/thermal_zone8/power: Is a directory
/sys/devices/virtual/thermal/thermal_zone8/slope
1
/sys/devices/virtual/thermal/thermal_zone8/subsystem
cat: /sys/devices/virtual/thermal/thermal_zone8/subsystem: Is a directory
/sys/devices/virtual/thermal/thermal_zone8/sustainable_power
0
/sys/devices/virtual/thermal/thermal_zone8/temp
cat: /sys/devices/virtual/thermal/thermal_zone8/temp: Invalid argument
/sys/devices/virtual/thermal/thermal_zone8/type
tj-therm
/sys/devices/virtual/thermal/thermal_zone8/uevent
checking the kernel configuration, i imagine that this sensor should be active
pseyfert@orin-1:~$ zcat /proc/config.gz | grep tj_therm -i
CONFIG_TEGRA_TJ_THERMAL=y
Any hints why that temp value can’t be read?
(FWIW: this means I can’t run jtop on the device, until its maintainer has a fix. though with jtop not being maintained by nvidia, i think we can focus on whether thermal_zone8/temp should be readable.)