Bug 511090

**Title:** Severe Mouse Cursor Corruption (Dotted/Squares) on KDE Plasma 6.5 Wayland with llvmpipe

**Summary of the Issue:**
After updating KDE Plasma from version 6.3.5 (where everything was working fine) to version 6.5.x, the mouse cursor is corrupted under a Wayland session. Instead of the intended cursor theme, it displays only as a series of **dotted squares or pixel artifacts**.

**Technical Details:**
This issue occurs specifically because the system is forced to use the software rendering driver, **llvmpipe**, instead of the dedicated AMD driver. This likely happens due to an issue with the GPU detection or driver loading for the **AMD Mullins APU** under the newer Plasma version. The previous version (6.3.5) handled this fallback scenario correctly.

**Key Point (Regression):**
The cursor was rendered perfectly fine in **KDE Plasma 6.3.5** with the exact same hardware configuration (AMD Mullins / llvmpipe / Wayland). This strongly suggests a **regression** was introduced in KWin/Plasma 6.4 or 6.5 regarding how it handles the software cursor rendering path.

**Temporary Workaround:**
The issue can be temporarily fixed by setting the environment variable `KWIN_FORCE_SW_CURSOR=1`.