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Valve adds support for games using CEG DRM through Steam Play Proton

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If you have the latest version of Proton Experimental, Valve just recently put up a new Steam Client Beta (October 28) too which allows playing Windows games on Linux that make use of their older CEG DRM. This is quite a big one actually, as it was a total showstopper for numerous games. Valve developer Pierre-Loup Griffais said on Twitter it's only "initial" support and to post any you test on the official GitHub bug report for it.

Some of the titles that may now work include:

  • Aliens vs. Predator (2010)
  • Bioshock Infinite
  • Call of Duty: Black Ops
  • Call of Duty: Modern Warfare 2
  • Hitman: Absolution
  • Just Cause 2
  • Lara Croft & the Guardian of Light
  • Mafia II
  • Saints Row: The Third
  • Sid Meier's Civilization V
  • Sniper Elite V2
  • The Typing of The Dead: Overkill

Plenty more have CEG DRM, so it will take time for all of them to be tested and reported on. Some titles probably still won't work with other issues present but it's getting another step closer. At least those that actually load up in some way now can see additional testing and work with Proton.

A new black Steam client service window will pop up when Steam goes to sort the CEG, eventually that should be hidden from users - so for now it's normal.

Giving a few titles a run myself this morning I was able to test that Saints Row: The Third, Call of Duty: Black Ops and Call of Duty: Modern Warfare 2 seem to work well now.

Article taken from GamingOnLinux.com.
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lectrode Oct 29, 2021
just a quick fyi: proton-ge added this commit for the proton-side of CEG support. if there are games that use CEG that require fixes in proton-ge (like Black Ops II), these should* run with the next release of proton ge (or now if you build it yourself).

*i haven't finished building it yet, but i have high hopes, since it works in lutris with wine-ge-custom and only needed the CEG support to run in steam proton


Last edited by lectrode on 29 October 2021 at 6:32 pm UTC
Philadelphus Oct 29, 2021
Quoting: BeamboomBut three of those titles (Bioshock, Hitman, Saints Row) are Linux native and have always worked?
And Civ 5. Or at least, it had a Linux version by the time I switched in 2014, don't know if it had it from launch. But hey, more Proton compatibility is always good.
chelobaka Oct 29, 2021
Not all CEG titles work so far. It seems Valve announced only the working ones.

  • Lara Croft & the Guardian of Light — works, takes a lot of time to start

  • Warhammer 40000: Space Marine — doesn't work

  • The Bureau: XCOM Declassified — doesn't work

  • Darkness II — starts, shows cinematics and crashes. Didn't start before.




Last edited by chelobaka on 29 October 2021 at 7:10 pm UTC
Torqachu Oct 29, 2021
Has anyone tried Warhammer 40,000: Space Marine - Anniversary Edition?
I hope it comes soon in a stable version or in proton-ge

EDIT oops, I was preceded by chelobaka


Last edited by Torqachu on 29 October 2021 at 6:59 pm UTC
ShinyaOsen Oct 29, 2021
Just tried GRID 2 it launches now but crashes when i select and start a profile and just cause 2 launches to a black screen using proton experimental so hopefully more work can be done. Also for some reason now there is a window that now pops up randoms thats called steam client service and when it launches it spins up my bluray drive and i loose control of what im doing really annoying happens almost every 30 seconds
Stoney_Fish Oct 29, 2021
Just Cause 2 is working
Stoney_Fish Oct 29, 2021
Lords of the Fallen is also working (just quick test)
alejandro-bringas Oct 29, 2021
Quoting: BeamboomBut three of those titles (Bioshock, Hitman, Saints Row) are Linux native and have always worked?

mmm yes, but they work fatal, Bioshock Infinite always have performance problems in my GTX 1060, in Windows I easily run it in Ultra 60fps, not here.

With Proton I get a very similar performance to Windows with a bit of stutter (shader cache) but it is 99% playable, much better than the native one.

and the MW2 already worked, I doubt that it had CEG, the one that did not work was MW3, which I already made a video of its but with a bad performance, I think a regression of Wine, Just Cause 2, Kane & Lynch 2 among others already they work well
Beamboom Oct 29, 2021
Quoting: alejandro-bringasmmm yes, but they work fatal, Bioshock Infinite always have performance problems in my GTX 1060, in Windows I easily run it in Ultra 60fps, not here.

With Proton I get a very similar performance to Windows with a bit of stutter (shader cache) but it is 99% playable, much better than the native one.
Back then I always said that I suspected those "ports" from Feral to in reality be more of a "wrapped" than "ported" game. I stand by that. I think they had their own "wine-like" layer they applied to the games, where the "porting" were merely customisations for that wrapper.
Yes, I know there are Linux binaries, but noone knows what goes on in there.
Comandante Ñoñardo Oct 29, 2021
Quoting: chelobakaNot all CEG titles work so far. It seems Valve announced only the working ones.

  • Lara Croft & the Guardian of Light — works, takes a lot of time to start

  • Warhammer 40000: Space Marine — doesn't work

  • The Bureau: XCOM Declassified — doesn't work

  • Darkness II — starts, shows cinematics and crashes. Didn't start before.


The last three are the ones I was about to try... You saved me time.
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