[filelight] [Bug 504857] New: Filelight doesn't display diagram on NVIDIA GPU with automatic rendering backend

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https://bugs.kde.org/show_bug.cgi?id=504857

            Bug ID: 504857
           Summary: Filelight doesn't display diagram on NVIDIA GPU with
                    automatic rendering backend
    Classification: Applications
           Product: filelight
      Version First 25.04.1
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: lolkek202k at gmail.com
                CC: martin.sandsmark at kde.org
  Target Milestone: ---

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.

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