Comment 8 for bug 1987209

I am getting very similar results.

For work a desktop computer was wiped and then imaged with Ubuntu 22.04. Like francois-lafont, I have noticed that when the system 'screen blank' activates, all my open windows in my session are closed after logging back in.

About my system (from About menu in Settings)

- Dell OptiPlex 3050
- 32 GB RAM
- Intel® Core™ i7-7700 CPU @ 3.60GHz × 8
- AMD® Radeon rx 550 / 550 series / Mesa Intel® HD Graphics 630 (KBL GT2)
- GNOME Version: 42.2

Monitors being used:
- Dell U2211Ht 22"
- Acer G226HQL 22"
- LG 32MA68HY 27"

Again, like francois-lafont's testing, I have reproduced this error by setting the 'Screen Blank' setting to 1 minute, then waiting for the system to enter the screen blank state. The following then happens.

1. Everything seems to be fading out as normal
2. Screens no longer have data that needs to be displayed, they go into sleep mode
3. After a brief period, screens are forced back on (where when this problem isn't happening, screens will remain in sleep mode until input provided by user)
4. System displays the dark login screen as if I was never logged in.
5. After signing in, all my open applications have been closed.

I have managed to circumvent this issue by choosing the option
'Ubuntu on xorg' before signing in, or by uncommenting the line

    #WaylandEnable=false

in /etc/gdm3/custom.conf. I then repeat the test described above after rebooting gdm3 and my session is saved, no issues.

I have attached my own results that I found after a 'journalctl -b0'. The text in the file are some of the lines before and after the line:

    gnome-shell[xxxx]: segfault at ....