Comment 18 for bug 1874567

@Marco,

Hi, here is the steps when verifying mutter from focal-proposed:

1. Upgrade all packages to latest version in focal-updates.
2. Enable focal-proposed in source list
3. sudo apt install mutter
4. Configure external screen orientation by selecting "Portrait Right"
5. Screen orientation doesn't change but asking save changes.
6. Press "Revert changes"
7. Configure external screen orientation by selecting "Portrait Right" again.
8. Screen goes to black screen.

Attachment is the journal log.
```
Jul 24 03:02:18 u kernel: show_signal_msg: 38 callbacks suppressed
Jul 24 03:02:18 u kernel: gnome-control-c[3252]: segfault at 7fff58ce6ff8 ip 00007fa5ef8b114c sp 00007fff58ce7000 error 6 in libc-2.31.so[7fa5ef841000+178000]
Jul 24 03:02:18 u kernel: Code: 1f 80 00 00 00 00 e8 b3 bb ff ff eb d1 90 f3 0f 1e fa 48 85 d2 0f 84 63 01 00 00 41 57 49 89 ff 41 56 49 89 d6 41 55 49 89 d5 <41> 54 4c 8d 25 4b 77 15 00 55 48 8d 2d ab 84 15 00 53 4c 29 e5 48
```