I just noticed something even weirder on Linux 4.1.0:
Until 4.0.5 the temperature reading from
/sys/devices/virtual/thermal/thermal_zone0/temp usually reported something
around 40°C in my case.
Now when I use Linux 4.1.0 the temperature reads something between -15°C and
-10°C which is obviously false.
Am Montag, 22. Juni 2015 14:31:00 UTC+2 schrieb Thomas Kaiser:
> Hi,
>
> schroete wrote on 18. Juni 2015 18:02:44 UTC+2:just seen that Hans did a
> temperature readout in sunxi-next in the
>
> sun4i-ts module.
>
>
>
>
> If this is responsible for the value reported by
> /sys/devices/virtual/thermal/thermal_zone0/temp then the output seems to be
> wrong.
>
>
> Steps to reproduce:
>
>
> - ensure that the A20 board is idle and query
> /sys/devices/virtual/thermal/thermal_zone0/temp (will show you something
> below 37°C)
> - press your thumb on the A20 while running and check again
>
>
> Expected result: temperature exchange between thumb and SoC: If the SoC's
> temperature is below 37°C it should increase, if it's above it will decrease.
> What happens with kernel 4.0 or above: the temperature reported by
> thermal_zone0/temp will further decrease below 30° which seems to be
> impossible. Unfortunetaly I cannot provide patches but just report that
> there's something going wrong.
>
>
> When I do a 'stress -t 900 -c 2 -m 2 -i 2' on an A20 board with kernel 4.0.4
> then temperature doesn't exceed 42.5°C (very unrealistic) when doing the same
> with kernel 3.4.107 and the sunxi-dbgreg module approach ('echo 'f1c25004:90'
> > /sys/devices/virtual/misc/sunxi-dbgreg/rw/write;') temperatures reported
> rise above 50°.
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