*** This bug is a duplicate of bug 1865837 ***
https://bugs.launchpad.net/bugs/1865837
Lubuntu is better using `sddm` in my opinion than swapping out that DM
for another just because currently five people have tagged "affects me
too" (including me too).
The issue can be mitigated; if I recall correctly, I've used it as
example of how to on Lubuntu's discourse, which to me is a more
appropriate fix for the issue (given it impacts so few boxes; just those
with specific radeon & I used with an intel card).
(other issues appeared with the 5.3 kernel used by 19.10 that had a like
effect impacting nvidia cards.. It's better for everyone if 99% of users
are using the most efficient DM (`sddm`) for Lubuntu, and the few
impacted by strange graphic glitches switch out if they deem it
necessary.
On my optiplex 755 I resolved the issue by changing login themes (sample
a few before I got one I liked & it had no glitches, but it was my
solution, but its not the only fix).
I'm not personally sure it's a `sddm` issue anyway, more `sddm` is
causing graphic glitches & the bug is actually in the 'driver' or kernel
module... why it appeared in 5.3/19.10, but I'm guessing.
Lubuntu is a small team, and we don't have resources to find & fix it;
and as I already stated, I don't think swapping `sddm` to another DM is
a wise move.
Thank you for your last comment, I'll mark this a duplicate.
Thank you for taking the time to report this bug and helping to make
Lubuntu better.
** This bug has been marked a duplicate of bug 1865837
Lubuntu 20.04 qa-test install; flashing at sddm greeter when mouse at top
panel (pre-login)
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https://bugs.launchpad.net/bugs/1927791
Title:
Lubuntu 20.04.2 LTS - artefacts issue on log in screen after log out
from the session
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