[Bug]: Flatpak can't see Nouveau driver with hybrid graphics

[VarLad]

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

1.15.8

What Linux distribution are you using?

Fedora Linux

Linux distribution version

40

What architecture are you using?

x86_64

How to reproduce

Step 1: flatpak run --command=bash com.usebottles.bottles
Step 2: vulkaninfo --summary
Step 3: Exit the shell and run vulkaninfo --summary on the host

(For step 1, anything that has vulkaninfo would do.)

Expected Behavior

Discrete GPU appears on the list of GPUs when run inside the flatpak shell.

Actual Behavior

Discrete GPU missing from the list of GPUs.
Not just that, the flatpak applications can't use my Discrete GPU for anything that requires it.

Additional Information

Tried with Nouveau + NVK.
Also tried with both Mesa stable + Mesa git flatpaks for NVK
Works with Discrete GPU drivers

[VarLad]

I believe the bug will be fixed with https://gitlab.com/freedesktop-sdk/mesa-git-extension/-/merge_requests/855
Will investigate again if the bug isn't fixed after the PR is merged