[kde] [Bug 467049] New: External Monitor Problem - Display Settings Off by 1 pixel Causing Screen Overlap

[Declan McGrath]

https://bugs.kde.org/show_bug.cgi?id=467049

            Bug ID: 467049
           Summary: External Monitor Problem - Display Settings Off by 1
                    pixel Causing Screen Overlap
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: declan at weuseopensource.com
  Target Milestone: ---

SUMMARY
When I use a Dell U2913WM (2560 x 1080) external monitor with my Dell XPS
laptop, a 1 pixel wide strip of the display that should only be on the laptop
monitor appears on the edge of the external monitor.

Callout: The big problem that this causes is when I ask KDE to bring to up the
"Present Windows - Current Desktop" overview (which I have set as a Desktop
Effect->Screen Edge trigger in Settings) all windows from both screens appear -
making this hard to use (otherwise this 1 pixel wide strip would not be a big
problem).




STEPS TO REPRODUCE
1. Log into KDE
2. Plug in external monitor - it will likely work fine (callout: set the
external monitor to display to the right of the laptop monitor if you want to
get the same test conditions as me)
3. Sleep KDE
4. Wake KDE (the resolution on the external monitor may come back on okay - or
it may not; if you repeat this step a few times it likely will come back wrong
eventually, though I can't be sure what the exact condition is that trigger it.
I get this issue every day however)
5. If the resolution on the external monitor is wrong then plug out and plug
back in the monitor
6. If the resolution is correct proceed to step 7. If not try step 5 again
7. Usually, if the resolution comes back correctly there will be a 1 strip wide
pixel down the left of my external monitor (that is likely from the laptop
display)

OBSERVED RESULT
A 1 strip wide pixel down the left of my external monitor

EXPECTED RESULT
No 1 strip wide pixel down the left of my external monitor

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Ubuntu Studio 22.10
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6

ADDITIONAL INFORMATION
Kernel Version: 5.19.0-1018-lowlatency (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i9-12900HK
Memory: 62.5 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: Dell Inc.
Product Name: XPS 15 9520

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