https://bugs.kde.org/show_bug.cgi?id=522284
Bug ID: 522284
Summary: Output of a vertical screen sometimes gets corrupted
Classification: I don't know
Product: kde
Version First unspecified
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 193785
--> https://bugs.kde.org/attachment.cgi?id=193785&action=edit
Corrupted screen output
DESCRIPTION
Under some circumstances (see below), the screen output of a vertical screen
can get corrupted, leading to fragmented windows and (in my case) screen
burn-in that lasted a few weeks.
STEPS TO REPRODUCE
1. Set up a vertical monitor next to a horizontal one
2. Close all windows, or have a window full-screen on the vertical monitor
OBSERVED RESULT
Screen output of the vertical screen gets corrupted (see attachment).
EXPECTED RESULT
Screen output is clear of artifacts.
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 7.0.12-1-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 1700 Eight-Core Processor
Memory: 16 GiB of RAM (15.6 GiB usable)
Graphics Processor: AMD Radeon RX Vega
ADDITIONAL INFORMATION
- The first time I noticed this was approx. 29th April 2026. Back then, I was
using KDE neon (now CachyOS, same problem) with up-to-date Plasma on Wayland.
- I do not think it is the graphics card's fault, as Windows does not have
issues. Also, it only happens when a window is either full-screen or there is
no window (i.e. on the desktop)
- When any of the following happens, it goes back to working *normally*, until
that condition goes away:
- right-clicking to see a context menu
- having more than one window visible or having a window and the desktop
visible => even an "always on top", 100*100px, 10%-opacity window in the corner
of the screen gets it back to a working state
- using a task bar (when it auto-hides it breaks again)
- even just the box-shadow of a window on a neighbouring monitor makes it
work again
- basically, whenever the rendering pipeline has to do more than rendering
a single thing, it works fine, but when it is just passing a window through to
the display, it breaks.
- The mouse pointer renders well as long as it doesn't touch the black bar (see
attachment). When the arrow goes into the black bar, it is not rendered
- This problem cannot be captured on a screenshot. On a screenshot (spectacle)
it renders the way it is supposed to.
- None of the display settings seem to have an effect on this, the problem
occurs always
- Both screens are attached via DisplayPort, swapping DP cables doesn't change
anything.
- LG Ultragear 27GS85QX-B 1440p 180Hz (not overclocked to 200Hz)
- More attachments:
https://www.swisstransfer.com/d/808c3fb4-8cf6-4f06-a86b-ce5aeec93b4f or
https://youtu.be/JH0_9gi9J4w
--
You are receiving this mail because:
You are watching all bug changes.
