https://bugs.kde.org/show_bug.cgi?id=443924
Bug ID: 443924
Summary: Screen turns off when login screen shows up
Product: kscreenlocker
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: greeter
Assignee: plasma-b...@kde.org
Reporter: h.k.gh...@gmail.com
CC: bhus...@gmail.com
Target Milestone: ---
SUMMARY
I updated to Kubuntu 21.10 yesterday, from 21.04. After the update, the login
screen no longer works as expected. Normally, the system shows the login screen
with its wallpaper background and you simply choose your account, enter your
password, and log into your session.
However, after the upgrade, every time I boot the system up to the greeter
login screen, it always turns off the monitor/screen. Trying to cause the
monitor to "wake up" by moving the mouse, turning it off/on with its power
switch, and so on does not solve the problem; the screen remains off.
Trying to switch to a different terminal (i.e., Ctrl+Alt+F{2..5}, etc.) doesn't
help. The *only* way in which I can get my screen back on is to just log into
my session. (This is possible for me because I have only one account and the
password box always has the focus, so I can just enter my credentials, hit
enter, and I'm good.)
As soon as you get past the greeter/login screen, the monitor's screen turns
back on and everything seems to keep working normally.
I'm on kernel 5.13.0-19-generic; I tried a few previous ones, but saw no
difference.
STEPS TO REPRODUCE
1. Upgrade Kubuntu from 21.04 to 21.10.
2. Reboot the system and wait until the login screen shows up.
3. Observe your screen get turned off.
OBSERVED RESULT
The login screen can be seen for a fraction of a second before the monitor's
screen is turned off.
EXPECTED RESULT
The monitor's screen is not turned off and instead remains visible all the
time.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.10
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
This was only observed on my desktop. I had updated my laptop from 21.04 to
21.10 before working on the desktop and the laptop did not show this problem. A
second Ubuntu laptop was also updated and no problem was observed.
This bug sounds like it could be related
(https://bugs.kde.org/show_bug.cgi?id=442969), as it seems to have some
similarities to the behavior I'm observing, except that I don't need to wait
for my monitor to go into sleep mode.
PS: I'm not sure if this is the correct product under which to file this bug,
as the product names/descriptions are not necessarily obvious, so, please, move
as appropriate if this isn't it. (I tried searching for login screen and other
variations, and the "greeter" seemed to be the most likely candidate.)
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