Compatibility Report

Just to clarify, this is likely not a specific game issue, but global injector issue. I did not try with other games, but I am pretty sure i will have same result with any game and this injector.
https://github.com/praydog/UEVR/releases
what it is:
https://youtu.be/J8Kk7coDGpk?t=133

Recently Epic Online Services updated when launching through Steam with Proton, it seems to have broken online compatibility with Epic friends. Reinstalled the game completely and started with a clean prefix and cloud saves off to ensure fresh install and it's still broken. Tried every troubleshooting step possible found on the net and I can surmise that the issue is related to the recent EOS update and no workaround currently. You are presented with the error 0x0002 'Epic Online Services could not be found, Please verify the install on your game client and relaunch Dead Island 2'

Confirming this is broken on Steam Deck, Installed it today and I'm getting the above error 0x0002 Epic Online Services could not be found, which means i cant play multiplayer with friends. @kisak-valve would you mind helping me with how to report this to Valve? I'm unsure how to reach out to game developer or Valve on this because it works fine on Windows but not on Steam Deck

Confirming this is broken on Steam Deck, Installed it today and I'm getting the above error 0x0002 Epic Online Services could not be found, which means i cant play multiplayer with friends. @kisak-valve would you mind helping me with how to report this to Valve? I'm unsure how to reach out to game developer or Valve on this because it works fine on Windows but not on Steam Deck

If you wanna help by posting the log file here, then go to your steam library, click on the game, then the gear icon, then properties, then in general go down to the launch options box and paste this in "PROTON_LOG=1 %command%". Then play the game again and trigger the epic online services error. Then go into desktop mode, find the log file, then paste it here.

Replying to https://github.com/ValveSoftware/Proton/issues/7667#issuecomment-2884350767

Log is from my Steam Deck

steam-934700.log

This should hopefully be fixed in Proton Experimental ([bleeding-edge], https://github.com/ValveSoftware/Proton/wiki/Proton-Versions#proton-bleeding-edge).

This should hopefully be fixed in Proton Experimental ([bleeding-edge], https://github.com/ValveSoftware/Proton/wiki/Proton-Versions#proton-bleeding-edge).

Epic Online Service is detected and it works again now on Steam Deck with Proton Experimental (bleeding-edge), Thank you so much!! 🎉🎉

steam-934700.log

The issue might be back ?
Having the issue here too. I shared my log here

The issue might be back ? Having the issue here too. I shared my log here

I'm not able to replicate any issue on both my Steam Deck or Desktop Arch Linux system w/ Proton Experimental (Bleeding-Edge and non-Bleeding-Edge)

Few questions:

1. Can you give more detail on precisely what you're seeing? Was it the same EOS error as mine previously? Screenshots may help as well
2. I could see in your log that you're running the game from a separate mounted disk, what is the the filesystem and what mount options are specified for that mount?
3. What are launch options (if any) in Game Properties > General > Launch Options
4. Do you have any custom environment variables set outside of steam? as in /etc/environment?

Some suggestions:

1. Remove all custom launch options from Game Properties > General > Launch Options
2. Test in a fresh prefix (backup your old one first)
3. Check you DNS settings and perhaps temporarily set your dns on the machine to 1.1.1.1 (cloudflare) to ensure it's not a dns resolution issue.

Replying to https://github.com/ValveSoftware/Proton/issues/7667#issuecomment-3212877028

I managed to make it work ! Thank you so much. Let me answer your questions, comments your suggestion one by one for anyone having the same issue:

(TLDR: Proton bleeding edge fixed the issue)

Answers

1. I am seeing this screen
   

2. The filesystem is extfat with these options -> nosuid,nodev,nofail,x-gvfs-show

3. I only had some options related to HDR and mangohud, removing them didn't help

4. No env variable outside of steam
   Trying your suggestion:

5. Didn't help

6. Didn't help

7. Didn't need to try.

Steps for me to fix: going to steam, show tools, right click on proton experimental, beta tab, select bleeing edge, done

I cannot make it work on non bleeding edge but it will do for now. Once again, thank you so much to @sh-jus

(TLDR: Proton bleeding edge fixed the issue)

1. The filesystem is extfat with these options -> nosuid,nodev,nofail,x-gvfs-show

Glad you got it working!

Just a heads up though, exFAT might be a culprit here and could potentially cause issues down the road. Since it doesn't support hard/symbolic links (which Proton relies on), you could run into problems with prefixes not being able to properly link DOS drives to Linux paths, among other things. It might work fine now, but these issues can be tricky to diagnose later.

I'd recommend mounting your games on a drive formatted with ext4 (recommended) or btrfs instead. If you need cross-compatibility with Windows, the ntfs3 kernel driver could work as an alternative since it does support symlinks (unlike exFAT), but it has its own caveats. Just make sure to symlink your compatdata directory from your host filesystem to the NTFS drive if you go that route.

Upon careful verification I could confirm I mistook and all my drives were already formatted to ext4. I though it was one of the fossil from the era I needed Windows.
But this it a very useful advice and anyone reading this forum should consider this carefully.

Once again, thank you for your time !

Using Proton 10 or Experimental Bleeding Edge, I got no video playback, only colored stripes like in this example image:

Using Proton GE just works, so something in current Proton is broken.