Quoting: x_wingKDE Neon (Ubuntu 18.04) here with Mesa drivers (18.1.6). It's running fine for me, just took a while to start the first time (you get a blurry window for about 30 secs.). The only problem are some artifacts while you move the camera, out of that, the frame rate and mechanics works fine for me at full graphics.

I'll try with Mesa 18.2RC and check if the artifacts go away...

EDIT: Ok, tested with 18.2RC2 at the artifacts are still there. Fortunately I figured out that they're generated by "Ambient Occlusion" option in the graphics setting. Disabling that feature all the artifacts goes away (I can play at max setting, only need to disable that effect). Definitely it takes some time to start the first time, probably because it compiles and creates a cache of shaders.

EDIT2: Video [External Link] showing artifacts and how they disappear when disabling Ambient Oclussion

An apitrace and bug report should be helpful if you have the time!
https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa [External Link]

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Turning off esync with PROTON_NO_ESYNC=1 got rid of the crashes I had in Carmageddon MD, increasing the file open limit wasn't enough.

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Quoting: GuestRunning Doom in Steam Play does not work for me.[...]

I think it still starts up in OpenGL mode, try setting the launch option "+r_renderAPI 1" to force Vulkan.

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I've had some problems with (unsupported) titles* opening file descriptors like crazy and eventually crashing. Not sure if it's a bug unique to Proton or a Wine issue.

* Carmageddon Max Damage, Quake Champions and possibly others.

Apparently this is because of Proton using the esync patch:
https://github.com/zfigura/wine/blob/esync/README.esync [External Link]

The comments in that file doesn't seem correct. Debian still have a 4096 limit by default. Anyhow, raising that limit does get rid of the errors. Carma still crashes but that's another bug.

...and esync can be turned off with PROTON_NO_ESYNC:
https://github.com/ValveSoftware/Proton [External Link]

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Quoting: X6205Is it possible also backup and restore Windows games in native linux client when they are compatible with new Steam Play? I have some Windows games backed up, for example Doom 2016. Can i restore from this backup to Steam client beta? I really don't want to re-download this game again under linux..

Works fine!

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Mafia II should be playable. But it will either not render shadows, or render garbage instead of shadows. Gallium Nine have the same problem.

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American Truck Simulator (and ETS2) are 70% off. I've been freeloading of the demo versions for a long time so I guess it's time for the full version.

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Quoting: GuestI swear this had a demo for Linux

Maybe I'm thinking of a different game

Apocryph did have a build.

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Quoting: EgonautThe Demo downloads 6.2GB for me but this is just the two first Tutorial missions, nothing more...

From http://steamcommunity.com/app/236870/discussions/0/2333276539613430162/ [External Link]

"All Steam users will be able to download The ICA Facility and the download includes absolutely everything that we’ve released for that location; two story missions (including all cut-scenes), two Escalation Contracts, more than 40 challenges, 17 achievements and trophies, plus thousands of player-created missions in Contracts Mode – all of that is now available completely free of charge."

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Looks like there were problems and it has been delayed.

There was a demo button on the store page, but it only downloaded an empty directory for me.

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