The next version of Steam Link for x86_64 Linux is now available.

You can get it from Flathub:
https://flathub.org/apps/details/com.valvesoftware.SteamLink
Make sure you follow the setup guide on that page before you install, if you have never used flatpak before.

Changes:

• Re-enabled keyboard input in the app UI when a controller is connected
  
• Improved Steam infrastructure performance