Fxc: User article

2023-02-20T19:50:57Z

User article

← Older revision		Revision as of 19:50, 20 February 2023
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	~~{{under construction}}~~

	=== Known issues ===		=== Known issues ===

Fxc: +temp

2021-04-22T11:59:45Z

+temp

← Older revision		Revision as of 11:59, 22 April 2021
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			{{under construction}}

	=== Known issues ===		=== Known issues ===

Fxc: Moved from another article

2021-04-22T11:59:13Z

Moved from another article

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=== Known issues ===

Some forum members reported screen delamination on their PinePhones, which was not caused by rough handling or mechanical damage to the phone. The delamination happens in the upper half of the screen, which clearly suggests that the root cause is the heat generated by the A64 SoC, which is underneath that part of the screen. See [https://forum.pine64.org/showthread.php?tid=13636 this forum thread] for further information.

As a preventative measure, more restrictive thermal throttling can be applied to the A64 SoC in PinePhones. First, the default thresholds for CPU thermal throttling on a PinePhone can be checked using the following commands:

grep . /sys/class/thermal/thermal_zone0/trip_point_*_temp
grep . /sys/class/thermal/thermal_zone0/trip_point_*_type

Needless to say, the default thresholds allow the CPU and the upper third of the screen to become very hot even under light CPU load. The following commands can be used to configure more restrictive CPU thermal throttling:

echo 45000 > /sys/class/thermal/thermal_zone0/trip_point_0_temp
echo 65000 > /sys/class/thermal/thermal_zone0/trip_point_1_temp
echo 100000 > /sys/class/thermal/thermal_zone0/trip_point_2_temp

The unit for all numeric values is millidegree Celsius. Those commands can be executed either manually, from a shell script, or some [https://man.archlinux.org/man/sysctl.8.en sysctl] rules can be configured to perform the settings upon each boot.

Of course, those thresholds can be tweaked until the desired reduction of temperature is achieved. Current CPU temperature can be checked using the following command:

cat /sys/class/thermal/thermal_zone0/temp

Further information can be found in these two documents from the Linux kenel source:

* [https://www.kernel.org/doc/Documentation/thermal/sysfs-api.txt Documentation/thermal/sysfs-api.txt]
* [https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface Documentation/hwmon/sysfs-interface]

User:Dsimic/PinePhone Screen Issue - Revision history

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