Ubuntu 20.10 Desktop on Pi4B - screen-freeze after idling at login-screen

Bug #1909678 reported by Juliane on 2020-12-30
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux-raspi (Ubuntu)
Undecided
Unassigned
Groovy
Undecided
Unassigned
Hirsute
Undecided
Unassigned
xwayland (Ubuntu)
Undecided
Unassigned
Groovy
Undecided
Unassigned
Hirsute
Undecided
Unassigned

Bug Description

It is the same bug already described here: https://askubuntu.com/questions/1300689/problem-with-usb-keyboard-and-mouse-on-raspberry-pi-4b-with-ubuntu-20-10

My system:
Linux myRaspi 5.8.0-1010-raspi #13-Ubuntu SMP PREEMPT Wed Dec 9 17:14:07 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

I'm using
- Raspberry Pi4B 8GB
- Logitech MK120 Keyboard and Mouse (wired).

How I could reproduce the mentioned crash:
- Boot and wait (don't touch mouse/keyboard) at login-screen for five minutes
- After five minutes, screen will turn black
- If you move the mouse then, screen will be back again but frozen (mouse/keyboard not working).

- restarting gdm.service via ssh is possible: sudo systemctl restart gdm.service
- restarting it via Alt+SysRq+k is possible, but login after that fails for some reason

Workaround:
In /etc/gdm3/custom.conf, change #WaylandEnable=false to WaylandEnable=false
as described here: https://unix.stackexchange.com/questions/460041/xwayland-crashes-frequently

Juliane (juliane11) on 2020-12-30
affects: ubuntu → linux-raspi (Ubuntu)
Juliane (juliane11) on 2021-01-01
description: updated
summary: - Ubuntu 20.10 Desktop on Pi4B - x-server crash when idling at login-
+ Ubuntu 20.10 Desktop on Pi4B - screen-freeze after idling at login-
screen
tags: added: gdm wayland
removed: crash x-server
Pamela Fong (katsiki) wrote :

Bought a brand new Raspberry Pi 4 B 8GB, and booted from SD card imaged from,

  ubuntu-20.10-preinstalled-desktop-arm64+raspi.img

Experienced freezing on first reboot after timeout. The suggested workaround works for me. Have since updated to,

Linux owl 5.8.0-1011-raspi #14-Ubuntu SMP PREEMPT Tue Dec 15 08:53:29 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

It might be good to flag the issue in more prominent place for newbies to RPI who are installing Ubuntu. Although I have experience with Ubuntu, it took me a while to locate this issue and workaround.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in linux-raspi (Ubuntu Groovy):
status: New → Confirmed
Changed in linux-raspi (Ubuntu):
status: New → Confirmed
Juerg Haefliger (juergh) wrote :

Confirmed that the screen freezes after the timeout on first boot. Xwayland is running and gnome-shell is at 100% CPU usage.

I don't believe it's a kernel problem. There are no suspicous kernel messages and keyboard or mouse activity does turn the screen back on.

Changed in linux-raspi (Ubuntu Groovy):
status: Confirmed → Invalid
Changed in linux-raspi (Ubuntu Hirsute):
status: Confirmed → Invalid
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