Hi everyone, I’ve made some other tests and debug yesterday.
Can confirm that it’s related to the quiet-therm-usr sensor.
With an sh script like this:
for VARIABLE in $(seq 0 95)
do
cat /sys/devices/virtual/thermal/thermal_zone$VARIABLE/type
cat /sys/devices/virtual/thermal/thermal_zone$VARIABLE/temp
cat /sys/devices/virtual/thermal/thermal_zone$VARIABLE/trip_point_0_temp
done
I have got all the name, actual temperature and threshold of the sensors.
The list is long, but quiet-therm-usr is:
quiet-therm-usr 39416 43000
So, 39,4 C° actual temp and 43 C° the threshold.
Then I’ve tried to poll data while using the phone and the display dimmed when this sensor hit the threshold:
quiet-therm-usr
40046
43000
quiet-therm-usr
40178
43000
quiet-therm-usr
42570
43000
quiet-therm-usr
41695
43000
quiet-therm-usr
43105
43000
When the threshold is reached this sensor send an uevent and trigger a “cooling_device” called:
panel0-backlight
255
168
When the display is at full brightness is like this:
panel0-backlight
255
0
The value 255 is the “max_state” and 0 or 168 is the “cur_state”.
To fix this there is a thermal-engine.conf in the system folder, that actually is empty.
Or probably there is some configuration in the ROM firmware or proprietary blob.
Anyway I have updated the issue in Gitlab and asked if it can be fixed/patched with the next beta release.
Hope they are not on vacation, because now with high weather temperatures it’s dimming even indoor, when the air conditioning is off.