Bug 504857

SUMMARY
Filelight fails to display diagram on systems with NVIDIA graphics cards when using automatic desktop rendering backend selection. The issue doesn't occur on AMD Radeon systems.

STEPS TO REPRODUCE
Install system with NVIDIA graphics card
Keep desktop rendering backend set to "Automatic" in system settings
Launch Filelight
Select any folder for analysis

OBSERVED RESULT
Disk usage diagram is not displayed in Filelight window. The interface loads but the visualization is missing.

EXPECTED RESULT
Should display circular diagram with disk space usage visualization, as it works on AMD Radeon or when forcing other renderers.

SOFTWARE/OS VERSIONS
Arch Linux, 6.14.7-arch2-1, KDE Plasma 6.3.5, Wayland
Qt 6.9.0
KDE Frameworks 6.14.0
Filelight Version: 25.04.1
GPU: NVIDIA RTX 3070 Ti (issue reproduces), driver 570.153.02
GPU: AMD Radeon RX 5700 XT (works correctly)

ADDITIONAL INFORMATION
Workarounds that solve the issue:

Launch with environment variable: QT_QUICK_BACKEND=software filelight
Change desktop rendering backend to Vulkan in system settings
Using AMD Radeon instead of NVIDIA (issue doesn't reproduce)

The problem is specific to NVIDIA GPUs and related to Qt Quick's automatic renderer selection. When forcing software renderer or Vulkan, everything works correctly.