[Letux-kernel] thermal madness

Andreas Kemnade andreas at kemnade.info
Fri Sep 13 21:44:44 CEST 2019


Hi,

I was experimenting a bit a bit with the thermal:

fresh after rebooting and autoidling uarts and loading some modules I
made the letux3704 device consume 32mA, so I expect the temperature to
being low.
Reading the thermal gives this:

root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
58500
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
47000
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
47000
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
47000
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
47000
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
47000
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
48500
root@(none):/# cat /sys/devices/virtual/thermal/thermal_zone0/temp 
48500

That is just the opposite to what Nikolaus was getting. Here it jumps
down instead of up and stays stable.
My conclusion: the measurements are buffered somewhere/somehow and we
are getting something old here. 

Regards,
Andreas


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