Comment 26 for bug 1895905

Walter/wxl asked me to test `sddm-theme-breeze` I skipped in comment #22, report posted (https://discourse.lubuntu.me/t/login-screen-flashes/1634/17?u=guiverc) days ago now pasted here

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I added `sddm-theme-breeze` and rebooted, yuk! (I had forgotten to perform the `sudo update-alternatives --config sddm-ubuntu-theme` step but `sddm` had been changed by the additional of a virtual keyboard) making it harder to use.

I've seen this before (*semi-recently with dual screens*) and recalled the on-screen keyboard appearing on secondary display, but it booted with keyboard drawn on black background, on mouse movement etc it would flash between black, on-screen keyboard (using 2/3rds of single display) & background.. *yuk*

If a user watched the display, they'd have trouble being able to login.

`sddm` is still working, if I close my eyes & login as I'd expect it to operate, I'm logged in, but visually it's a mess & unusable on that box.

The behavior is very familiar though, I added `kubuntu-desktop` to my Lubuntu *focal* installs on d755-5 (mentioned 4 messages up, AMD and flashing `sddm`; [lp 1865837](https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1865837)) and that box has only single display and it had the same behavior if I recall correctly. (*it was also added to hp8200 install which has the two displays*)

Finally I performed the `sudo update-alternatives --config sddm-ubuntu-theme` to make the 'new' breeze default, and on reboot it hung before eventual shutdown...errors?

`sddm` didn't appear again. The GUI session now has a large pointer, which I can move around with the mouse, but nothing more.

I can fix this currently by changing the theme to something else, but with the virtual keyboard appearing on all themes now, they're all rather annoying..

I've taken some photos of messages I see on screen (sddm-greeter & nouveau) but my phone is being annoying (no messages in `dmesg` or `journalctl` which I could easily paste; & `/var/log/sddm.log` is empty). Most messages appear during shutdown which was ultra slow with breeze the default.

Switching to another theme and shutdown returns to normal, messages gone (*just virtual terminal remains which isn't helpful*).

The one message I get on text terminal (with breeze active) is
`[ 120.676863] nouveau 0000:01:00.0: DRM: GPU lockup - switching to software fbcon`
written after the "Optiplex990 login:"

Either a requirement is missing (package error) or we're missing something in config??

-- links to photos
- shutdown messages
https://photos.app.goo.gl/Yf5pK28w4FMUmSi17
https://photos.app.goo.gl/VBvvRrzKMDWjxPjx5
- switching to text terminal; message
https://photos.app.goo.gl/nRJEGJHd45WoenSb8
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Additional note, the switching-to-text-terminal message (last photo link) I saw once today too, I think when using `gdm3`, but I don't believe I did when using `lightdm`. If this detail is useful, I'd need to re-test to confirm this