When Epic Games announced its Easy Anti-Cheat (EAC) service would be officially supported on the Steam Deck, the company said it was possible to "activate anti-cheat support for Linux via Wine or Proton with just a few clicks". Unfortunately, according to a developer of Warhammer: Vermintide 2, this seemingly isn't the case.
In a Steam discussion thread (via GamingOnLinux), Fatshark staff member Hedge revealed that there are in fact two versions of EAC: EOS (Epic Online Services) and non-EOS. Hedge says this presents a problem for some developers who want their games to run on the Steam Deck, because "most games historically use Non-EOS EAC. It's the one Vermintide 2 uses as well. Epic only added Proton support for the EOS version of EAC. Therefore, in order to implement Proton support for Vermintide 2, a huge amount of reworking of the EAC implementation would be required".
Dead by Daylight developer Behaviour Interactive previously alluded to this issue back in October, leading to concerns that it and other popular Steam games may not work on the Steam Deck at launch (if at all). Worse still, BattlEye, another popular third-party anti-cheat service, is also creating issues for games like DayZ, which may not work on the Steam Deck.
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