Running Flatpak Applications with NVIDIA GPU

[Neil Clack]

I have an NVIDIA GTX 2060 Max-Q installed.
I've got the NVIDIA drivers installed and running (525) and I even have 
cuda setup and can query nvidia-smi to get the GPU status.


I also have Runescape installed via Flatpak. Previously, I've played 
this game in ubuntu but to be honest I'm not sure if it was using the 
NVIDIA gpu or not.
Well, I noticed some performance issues and decided to check, and what 
do you know, as far as I can see, it's not using the GPU.

I can't find anything relevant online regarding selecting a GPU to 
utilize with a specific application.
I have seen references to NVIDIA-Prime, which is also installed, but my 
nvidia x server settings look nothing like anything referenced along 
with this.


I did try running `DRI_PRIME=1 flatpak run com.jagex.RuneScape` and I 
got this error during loading:

`libEGL warning: egl: failed to create dri2 screen`


I'm not skilled enough yet in linux-fu to really dig into this so any 
help would be useful.

I just want to make sure that all applications capable of utilizing my 
GPU are actually utilizing it, especially this game, and in the future, 
Epic/Steam games so I can finally ditch Winblows for good (aside 
from..... Fusion 360).


Thanks in advance.