https://bugs.kde.org/show_bug.cgi?id=472578
Bug ID: 472578
Summary: Second monitor stopped working -- Only cursor shows
Classification: Plasma
Product: kwin
Version: 5.27.4
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: grave
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: william.full.m...@gmail.com
Target Milestone: ---
Created attachment 160503
--> https://bugs.kde.org/attachment.cgi?id=160503&action=edit
Dual monitor desktop -- 2nd monitor is displaying BLACK ... But screenshot
shows a desktop.
SUMMARY
When I restarted the workstaiton the second screen no longer displayed as a
desktop extension. A power-off and restart cycle had no effect. I am pretty
much stymied now because I need both monitors to perform several essential
activities. Trying to use just one screen will really curtail productivity.
Everything worked just fine before the system shutdown.
Also I ran the "Display and Monitor" system settings pressing 'Detect" did not
display on the 2nd screen, the cursor displays. So I can see that the hardware
is fine. In addition, I made the second screen a mirror of the first screen
with the "Replica of" setting; the second screen came-to-life showing a clone
of the Primary monitor.
Turning the replica off however left me with a black screen.
This appears to show several symptoms in common with earlier bug:
[#450068](https://bugs.kde.org/show_bug.cgi?id=450068) and its duplicates.
STEPS TO REPRODUCE
1. I do not know what happened, the monitor was 'gone' after a restart.
OBSERVED RESULT
NO second monitor -- I have attached a screenshot of the two screen set-up.
When you look at the screenshot there is a second monitor desktop showing. I
do NOT see that. I only see a black monitor and the cursor is displayed as it
moved in that part of the viewport. May be there is a clue in that
screenshot??? I actually expected half of the graphic to be black!
EXPECTED RESULT
* Expect it to work as it has done since I installed Plasma/Kubuntu on this PC
back for 21.10, it has worked absolutaly fine for dual monitor case.
* Expect some easy to find documentation to say where to look in the
configuration files to determine what a normal multi monitor set-up should look
like. Obviously the Display and Monitor gui does not tell the whole story. In
fact once I saw that the "Replica of" setting showed me that the second monitor
worked fine in both esoftware and hardware, I discovered it is non-trivial to
get the extended display setting back (ie. No Replica).
* I also think and "About" box could have a tab to say where to find critical
elements like:
* Relevant config files
* Relevant log files
* Link to things like troubleshooting wiki page or commands that might be
useful in documenting or understanding what is going on.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
Operating System: Kubuntu 23.04
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.2.0-25-generic (64-bit)
Graphics Platform: X11
Hardware
Processors: 16 × AMD Ryzen 7 2700X Eight-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: llvmpipe
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B450 AORUS PRO WIFI
ADDITIONAL INFORMATION
* Attached information
* Window manager - KWin
* X-Server
* syslog (since reboot)
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