Blizzard broke Diablo IV on Linux / SteamOS machines with the Season 14 update, but Valve have now fixed it themselves in Proton Hotfix.
Valve don’t really announce updates to Proton Hotfix like they do for Proton Experimental (which they also just updated).
Instead, we have to keep an eye out for changes to new versions and for games getting it set as the default.
In this case we can spot it happening via SteamDB where Valve have now set Proton Hotfix for Diablo IV by default.
Quick tip – check out the GamingOnLinux Guide to all the different Proton versions.
Checking on my Steam Deck OLED and yep – login and everything works again:
Frustrating if you wanted to jump in with the update – but that’s a good turnaround time for Valve getting it officially fixed in Proton so you don’t continue to miss out.
Hopefully this issue won’t happen again – but that is part of the problem Valve face with Proton.
Developers do all sorts of weird things that work on Windows that Valve then have to fix up or do workarounds in Proton updates.
Maybe with the release of the Steam Machine and the upcoming Steam Frame, we may begin to see more developers test and verify updates first.
One can dream anyway.
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**📚 Original Source:**
[Valve fixed Diablo IV on Linux / SteamOS via Proton Hotfix](https://www.gamingonlinux.com/2026/07/valve-fixed-diablo-iv-on-linux-steamos-via-proton-hotfix/)
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