Bug 506138

SUMMARY
The cursor duplicates at a 2-3cm offset horizontally and the screen below it corrupts at seemingly random points (corruption looks like full screen width, single color or striped area). Moving the mouse clears the corruption. Sometimes the corruption appears when selecting textboxes and the blinking cursor appears; Corruption appears and disappears synchronised with cursor blinking, until mouse is moved then corruption does not appear.

STEPS TO REPRODUCE
1. Open a text area (Kwrite, or web text box)
2. Alternate focus between the text area and some other element to trigger the corruption; bug more reliably appears with the mouse being static after focusing.
3. Bug can also appear in other contexts, such as scrolling through the system settings list or application launcher entries, or hovering over panel entries.

OBSERVED RESULT
pointer duplicates, full screen width diplay corruption south of the pointer

EXPECTED RESULT
corruption does not appear

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.3-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor
Memory: 32 GB of RAM (31.2 GB usable)
Graphics Processor: AMD Radeon RX 7800 XT 
Mesa 25.0.7

ADDITIONAL INFORMATION