Black screen regression on Google-Krane

Describe your issue

What's the expected behaviour?

Device should not black-screen.

What's the current behaviour?

Sometimes, after having the device closed (the keyboard flipped onto the screen) it only shows a black screen.

How to reproduce your issue?

1. Use your device.
2. Close the device by flipping the keyboard onto the screen.
3. Maybe leave the device for a day.
4. Sometimes it will show a black screen and seemingly not react to anything.

What device are you using?

google-krane

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v24.06

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• GNOME Shell on Mobile
• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Please fill out

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

circa 2023-08

Additional information

This regression happened when I updated on the 25th of October 2024 after not having updated for almost 3 weeks. It updated from:

• KDE-Plasma-Version 6.1.5
• KDE-Frameworks-Version 6.6.0
• Qt-Version 6.7.2
• Kernel-Version 6.6.36-mt8183

to:

• KDE-Plasma-Version 6.2.2
• KDE-Frameworks-Version 6.7.0
• Qt-Version 6.7.2
• Kernel-Version 6.6.36-mt8183

It is intermittent but happens almost every day during use at school. The device will show a black screen (I cannot tell if the backlight is on or not) and seemingly not react to any inputs. There was an issue with the lock-screen in the past, where I had to switch to a different TTY to unlock the screen, but this time I cannot switch to a different TTY. The only sign of life I get from the device is the charging LED working when I plug a charging cable into it. Plugging it into a computer not only doesn't show any USB network on the computer, but doesn't even have the device show up in lsusb.

I tried getting logs using logread -b n but even the logread -b 0 logs are too outdated. Running just logread yields up-to-date logs. I assume there is some issue with logging due to #3269 (closed)

Holding down the power button for a very long time and then leaving the device for a while allows me to boot into the system again. The battery doesn't show up as empty after booting again either. Last time it still showed above 60% battery, even though I didn't plug a charging cable into it since it locked up. I don't think it is an issue with it not waking from sleep, because it looks like the kernel version is the same as before the update.

added chromeos release-edge labels

assigned to @WeirdTreeThing

@WeirdTreeThing any idea how to debug this?

Is there a way to disapbe sleep if the keyboard is folded over?

On my krane with edge, but on gnome-desktop, I do not see this problem

Is there a way to disable sleep if the keyboard is folded over?

Plasma Mobile comes with an easily accessible "caffeine" mode, which is supposed to disable sleep, as far as I understand.

Getting access to a serial console via a SuzyQ cable would help. I assume you two don't have one, but I do. However, I don't have a keyboard for my krane so I am unable to reproduce this issue myself, unless a different method of sleeping produces the same issue.

I actually have one of those adapters, I just never used it. I guess I will plug it in next time and see what happens.

@WeirdTreeThing do you know how to use the SuzyQ serial console? It seems to only print and only during boot. I assume I need to add some kernel command line parameter to postmarketOS. Nevermind, Elly told me that it is console=ttyS0,115200n8

SuzyQ has been a dead end so far. When the device enters the problematic state, the serial console over SuzyQ stops working. So I think it is safe to say that either the kernel panicked, or the system is frozen.

The last idea I have is carrying a second computer that logs the SuzyQ console 24/7 and hoping that something will be logged (and that I don't run out of power).