Desktop: Add udev rules for Steam devices

[danirabbit]

Fixes https://github.com/orgs/elementary/discussions/866

This only adds 20KB

It sounds like there isn't a mechanism for Steam to interface with udev in Flatpak at the moment and it's unclear what the roadmap is upstream.

I'm hearing that to complete Steam support we also need to pull in steam-libs but this adds a bunch of other packages like curl and zenity and fonts-liberation.

I wonder if we can get away with just manually including libasound2-plugins and libva-glx2 if that would solve the performance issues cited

[danirabbit]

@sorceresslucienne would you be willing to check for me if the issue your facing is resolved by installing just:

• libasound2-plugins
• libva-glx2
• steam-devices

and not installing

• steam-libs

You'd need to try this on a relatively fresh install to make sure you don't have any of the other packages that steam-libs pulls in

[danirabbit]

I think installing those 3 packages might have improved performance a little bit for me, but generally my computer is very low powered so it just can't handle those kinds of games regardless so I can't really confirm

[danirabbit]

Actually I wonder if we even need libasound2-plugins either. It might just be the gl lib

[sorceresslucienne]

@sorceresslucienne would you be willing to check for me if the issue your facing is resolved by installing just:

* `libasound2-plugins`

* `libva-glx2`

* `steam-devices`

and not installing

* `steam-libs`

You'd need to try this on a relatively fresh install to make sure you don't have any of the other packages that steam-libs pulls in

Unfortunately I don't have the spare hardware to test this, apologies.

[sorceresslucienne]

Note: I hope to be able to test this out this weekend on a fresh install.

[sorceresslucienne]

@danirabbit

Update: I tested with the following and Baldur's Gate 3 and Hades II run at unplayable frame rates...

• Brand new elementary OS install
• All System and AppCenter updates installed
• nvidia-driver-580 installed
• Fresh install of Steam and both games
• GE-Proton10-25 compatibility tool used for both games
• Only "libva-glx2" and "steam-devices" packages installed (no "steam-libs")

It looks like "steam-libs" is providing more here than just that one package for performance. I will leave my system as-is if you can get back to me with next steps.

Thank you!
-Eri