After a lengthy chat session with @megous (Ondrej), the conclusion is that the screen delamination issue could be very well related to the heat generated by the CPU, which of course cannot be known for sure, at least for now. This issue has also been brought to the attention of Pine64, thanks to @xalius, and the PinePhone production team will investigate the issue.
However, it's better to be on the safe side. This issue might be simply a result of a bad batch of phones, which used bad or weak glue, but it's much better to have more restrictive CPU throttling configured on hundreds of phones, as a preventative measure, than to have dozens of screens damaged. Maybe the heat isn't the root cause, but changing software settings is cheap, while replacing damaged screens isn't.
In other words, it's highly advisable that everyone configures more restrictive CPU throttling on their PinePhones, and reports back their experience (CPU temperature, how hot the screen feels to the touch, is there a noticeable slowdown, etc.) with different values for the CPU throttling parameters. Based on the reports, changes will be made in the Linux kernel tree maintained by Ondrej, so the more restrictive CPU throttling eventually becomes the default.
There are even some plans for implementing system-wide dynamic thermal throttling, which would involve other components of the phone besides the CPU, but let's not jump the gun yet.
This would also improve the overall safety of the phone.
Edit: This document provides a comprehensive insight into the thermal issues encountered in mobile devices, i.e. smartphones.
However, it's better to be on the safe side. This issue might be simply a result of a bad batch of phones, which used bad or weak glue, but it's much better to have more restrictive CPU throttling configured on hundreds of phones, as a preventative measure, than to have dozens of screens damaged. Maybe the heat isn't the root cause, but changing software settings is cheap, while replacing damaged screens isn't.
In other words, it's highly advisable that everyone configures more restrictive CPU throttling on their PinePhones, and reports back their experience (CPU temperature, how hot the screen feels to the touch, is there a noticeable slowdown, etc.) with different values for the CPU throttling parameters. Based on the reports, changes will be made in the Linux kernel tree maintained by Ondrej, so the more restrictive CPU throttling eventually becomes the default.
There are even some plans for implementing system-wide dynamic thermal throttling, which would involve other components of the phone besides the CPU, but let's not jump the gun yet.
This would also improve the overall safety of the phone.Edit: This document provides a comprehensive insight into the thermal issues encountered in mobile devices, i.e. smartphones.
