I am running Arch Linux with KDE Plasma (wayland).
Today I discovered Steam Link. I enabled it and worked flawlessly with Steam games. But it showed a black screen for non-steam games (lutris shortcuts specifically) although the input did work. I thought it was a wayland issue and I was right as I immediately installed & switched to X11 session and I was able to see the game. I don’t know if it is an x11 issue but my Laptop’s (host) fans were running pretty fast and sometimes games were just crashing or refused to launch (which rarely happens on wayland). I doubt that just the addional overhead of steamlink is causing these issues (although I won’t reject that possibility) given I have pretty decent hardware — ryzen 9 8945h, rtx 4070 8gb laptop gpu, 32 gigs of ram.
Also on x11 a lot of display settings seem to be missing. I don’t want to keep x11 just for playing non steam games via steam link. So is there a way to play non-steam games via steam link on wayland session?
Oh I’m still a Windows user, haven’t yet migrated over (though I do have a Nobara install I’ve played with a bit, I haven’t tried to get Apollo working on it). I stream 2560x1440 and just ignore the black bars, but I could request 2560x1600 and I think it would work just fine (I prefer the higher resolution for higher quality, rather than the native 1280x800, though I can confirm that requesting 1280x800 works when my bandwidth is limited).
That setting is handled within Moonlight, and Apollo respects that setting by default, so Apollo presents itself as a virtual display with the resolution requested by Moonlight. At least that’s my understanding.