rodrigo_21 says that the game is running under the Steam default Proton 5.13-14 as well as Proton Experimental! This means that mainline Proton has been updated to work with this game so give that a try before using GE! I have not tested the performance differences between Eggroll and mainline, that may be something you would like to try. I hear GE is usually better for performance, but I don't have any data to back up this claim!

With Proton-5.21-GE-1 the game booted, initialised a save, played the introductory cut scene and booted into the 3D game engine with no issues on max settings.

I assume that once the game boots, we are pretty much in the clear as I played the previous version of this game on Linux all the way through on Proton. However, this version adds more features so I don't know if the game is 100% working - be sure to check the ProtonDB page[www.protondb.com] for any extra issues.

Adapted from the official instructions[github.com]

1. Download GE from GitHub
   5.21-GE-1[github.com] | Latest[github.com]
   
   
2. Extract the tar into where-ever you have RW access to, at this point it doesn't matter. For sake of simplicity, extract it into a folder called Proton-5.21-GE-1.
   
   
3. Once extracted, make sure the contents of the new folder look like this:
   
   
4. Move the folder to ~/.local/share/Steam/compatibilitytools.d/
   
   
   
5. Now restart Steam.
   
   
6. Go to Steam Settings:
   
   
7. Go to Steam Play and ensure that your settings look like this:
   
   
8. Go to DQXI properties...
   
   
9. and make sure "Force use of a specific Steam Play compatibility tool" is unchecked:
   
   
10. Restart Steam just to be safe!

Currently, from my initial testing, nothing appears to be (game breakingly) broken. There is still a weird bit of lag that was present in the original version when moving in small "corridors" (I don't know what they are called but basically they are the small paths that connect two part of the map, but hid the two halves around corners or bends), I assume this is a async level loading thing, it's not bad (maybe half a second of low frames) and only happens once ever like 3 hours. Other than this everything is fine. If I haven't mentioned it being broken here, it's probably fine. That includes things like 2D mode and photo mode.

THINGS I HAVEN'T TESTED:

• Completing the game (I want to enjoy it so it's gonna take 60 hours)
  
• Changing the language
  
• Changing the music
  
• Getting past the tutorial (I just wanted to make sure I could play this later)
  
• Getting new party members
  
• Zoom (fast travel)

Basically I'm at the point of the first battle with the initial 3 slimes. Given my experience with other games and the original version of this game, once you actually get into in-game engine you should be fine (this game is fairly un-intensive so there isn't much to worry about in terms of graphical artefacts)

All in all, this game seems to run just fine under Linux (with Proton) and I look forward to playing this again over Christmas.

• Update your system (including drivers if you are using propitiatory)
  
• Update to Proton-5.21-GE-1
  
• Ensure Steam is up to date
  
• Ensure that the Steam Runtime Library is up to date
  
• Check the integrity of the game's files

Have fun playing DQXI, it's a great game!

This is my system specifications, just for reference. Since everyone's system is different, you might have a different experience than me. For example, someone running the nVidia drivers might have issues that people using the free AMD drivers might not.

If you are having issues, please help the troubleshooting effort by leaving a comment with your issue and system specs, fill in a report at protondb, and if you are using GE potentially leave a bug report.

OS : Manjaro Linux
CPU : AMD Ryzen 5 1500X (with Corsair H100i AIO Cooler)
RAM : Corsair Vengeance LPX 24GB (3x 8GB)
GPU : XFX AMD Radeon RX 580 6GB
Storage : Samsung Evo 970 1TB
Motherboard : MSI B450-A Pro (MS-7B86)
Case : Corsair Carbide SPEC DELTA
PSU : Corsair CX450M

Some stuff from "System Information" on Steam:
Processor Information:
CPU Vendor: AuthenticAMD
CPU Brand: AMD Ryzen 5 1500X Quad-Core Processor

Operating System Version:
"Manjaro Linux" (64 bit)
Kernel Name: Linux
Kernel Version: 5.9.11-3-MANJARO
X Server Vendor: The X.Org Foundation
X Server Release: 12010000
X Window Manager: KWin
Steam Runtime Version: steam-runtime_0.20201203.1

Video Card:
Driver: X.Org Radeon RX 580 Series (POLARIS10, DRM 3.39.0, 5.9.11-3-MANJARO, LLVM 11.0.0)
Driver Version: 4.6 (Compatibility Profile) Mesa 20.2.3
OpenGL Version: 4.6
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 71 Hz
VendorID: 0x1002
DeviceID: 0x67df
Revision Not Detected
Number of Monitors: 1
Number of Logical Video Cards: 1
Primary Display Resolution: 1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 20.51" x 11.54" (23.50" diag)
52.1cm x 29.3cm (59.7cm diag)
Primary VRAM: 8192 MB

Sound card:
Audio device: ATI R6xx HDMI

Memory:
RAM: 24060 Mb

Was this guide helpful to you? Please thumbs up and favourite this guide so that other Linux users can see this and get this game working for them! Awards are appreciated but certainly not necessary, I'm just trying to do what I can to help! Thank you!

This guide is in active development and will be updated as time goes on/updates (if any) are pushed. If something breaks, please help the community find an answer by contributing to testing and fixing efforts (such as ProtonDB/GE bug reports). As time goes on and I become confident that Square Enix are finished pushing updates, this guide will probably enter version 1 status (or a "final" release), once that happens it will be updated less frequently however I will still be watching for comments so that this guide can remain relevant.

If you have contributed to testing efforts, thank you!

[24/12/2020] 0.6: added a confirmation that default proton instances are now working
[13/12/2020] 0.5: added new information from rodrigo_21
[11/12/2020] 0.4: fleshed out the "What broken?" and "Closing Words" section a little and added my system specs
[06/12/2020] 0.3: Added how to install Glorious Eggroll + formatting + removed gamepad from list of things not yet tested
[05/12/2020] 0.2.1: Added the contributor testing notification to the what's broken section
--------------- 0.2: Some information on how to install GE and formatting
[04/12/2020] 0.1: init release