[Bug]:After updating Flatpaks, multiple apps (Prismlauncher, Steam) on Debian 12 select llvmpipe; host glxinfo reports hardware-accelerated Radeon R9 380; Steam Flatpak uses Freedesktop 26.08/Mesa 26.2.2. #6872

Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.
• If this is an issue with a particular app, I have tried filing it in the appropriate issue tracker for the app (e.g. under https://github.com/flathub/) and determined that it is an issue with Flatpak itself.
• This issue is not a report of a security vulnerability (see here if you need to report a security issue).

Flatpak version

1.14.10

What Linux distribution are you using?

Debian

Linux distribution version

12

What architecture are you using?

x86_64

How to reproduce

1. On Debian 12, install and update the affected Flatpak application from runtimes 23.08 to 26.08

2. Launch Steam from Flatpak

3. Open Steam → Help → System Information and check the Video Card section. It reports Mesa llvmpipe instead of the AMD GPU. Repeat with PrismLauncher. It also uses software rendering.

4. Prism launcher and Steam use llvmpipe rather than my AMD Radeon R9 380, making games unusable or extremely slow. Heroic launcher works fine however.

• Debian 12; kernel 6.1.0-44-amd64; Flatpak Steam uses `org.freedesktop.Platform/x86_64/26.08

• AMD Radeon R9 380 / Tonga; host glxinfo says Accelerated: yes and renders with the Radeon.

• Steam and PrismLauncher Flatpaks report llvmpipe and began after updating Flatpaks.

• amdgpu is loaded; /dev/dri/renderD128 is readable and writable and Flatpak contains radeonsi_dri.so.

Expected Behavior

• Lauch game.
• Have DXVK overlay show amdgpu as selected.

Actual Behavior

• Flatpak applications use llvmpipe, making games unplayable.

Additional Information

I'm at quite a loss as to what the issue could be, I tried forcing Steam to use my amdgpu but that doesn't fix it either.