

Native version works great and out of the box. No tinkering required
run smooth, just make sure the internet is good

No issues whatsoever.
Seems to run better under Arch than it does on Windows.

--skip-launcher
Tiny, rare crackling.
Althought the game has a native Linux build, it crashed right after a few minutes of play and had graphical issues. Running on a current stable Proton and it's super solid, works a charm!

Works out of the box
Works as it should ! out of the box! Native on Linux! Awesome !

Works fine out of the box
The gamepad with Steam Remote doesn't work with this game.
The game works fine when playing directly on the local machine.

Windows version installs and plays flawlessly
As a rule, I prefer playing the Windows version of a game using Proton, rather than the Linux native version if there is one. For this game, the windows version plays without any issue.
Игра идет идеально из коробки. Прошел полностью.

ran fine
no issues running the game

As was noted by other users, the game fails to recognize both Xbox os PS controllers. You have to link libSDL2-2.0 against the one in /usr/lib instead of the shipped one.

The game works fine but if you want to play with a xbox controller, you should do this for xbox compatibility : cd ~/Games/Heroic/Divinity\ -\ Original\ Sin\ Enhanced\ Edition/game
mv libSDL2-2.0.so.1 libSDL2-2.0.so.1.SAVE
ln -s /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0 libSDL2-2.0.so.1
And that's perfectly work in my case.
I have already explain this issue and its resolution

Works great out of the box
Did a full single player playthrough without any problems

I always use proton experimental, didn't even try standard version.

Works great out of the box. No tinkering required.
Note the item highlight key is different for Linux: hold the "x" key to highlight items. It's Alt by default in Windows.

Item Highlight may not work
The item highlight doesn't seem to work properly on the linux copy. Works fine on the Windows copy.

Setting TDP and GPU clock frequency under 10W and 1000 with tearing and half-rate shading at 30 FPS can net you close to 4-5 hours, even with in-game graphics set to Medium. If the FPS is set to 60, you may get around 2-3 hours, maybe close to 4.

Capped fps to 40hz to get better battery, but if battery isn't as important, it'll run at a solid 60fps at ultra.

No reason to think it's any better or worse than on any other platform.
I was in a fight in a separate area from one of my companions and switching to that companion gave me a black screen with only the cursor showing; I had to kill the game forcefully to get out of it. This was fully reproducible (in that after logging back in, doing the same thing produced the same problem). The problem never occured on the Steam Deck, so the problem is not necessarily platform/OS-specific.
Using direct connect to play coop with my partner (hosting the game on their Steam Deck):
- Hibernating and reawakening the host prevented me from connecting, so both had to exit and restart/-join, which is annoying when you have to enter a new long session ID every time.
- Normally the session ID is saved in case you need to reconnect to the same session, but not when in controller mode.
For shared/split-screen, the age old problem of a newly connected controller not being recognised by the game is, somewhat unsurprisingly, alive and present here too. Only tried once by connecting a second controller and it wasn't recognised. Did not spend time triaging the issue or test what did/-n't work beyond launching the game in BPM with both controllers connected, which did work.

Flawless (Linux Mint, default Proton option (8.0-3 or Experimental) - Native version untested.
XBox Series controller works flawlessly too.

Linux version work, but use different folder to store saves, so no windows-linux save transferring.
only on widows version by proton, linux isn't work
Runs great
Installed from steam and played. No issues experienced and it runs great
Native version runs at 10fps. Switched to Proton Experimental and that fixed it.
Native version runs terribly; Proton version runs perfectly.
Runs perfectly out of the box
Lowered graphics settings
Tabbing out of Borderless mode minimizes the game
runs out of the box. Installed and started - only had problems with the borderless mode. No proton / ge-proton needed for me
Small text, readable but helps if you use the magnifier tool.
Game crashes frequently just like Divinity 2
Once changing to Proton Experimental the Deck controls worked correctly. Without that the controls don't work with the official layout.
Works great on Proton Experimental. The official controller layout doesn't work at all with the default Proton version. It doesn't recognize the Steam Deck inputs as a controller. There are custom layouts that work well but you're also missing out on UI changes to button prompts, radial menus, and changes to the menu that make it easier for controller navigation.
The game works fine on Steam Deck as long as you use Proton and not the native linux port.
The native linux version does not detect the controller input of the steam deck on the initial launch nor did it launch with 720P resolution of the Steam Deck as it defaulted to 1080P.
When i changed to Proton i had no problems with controls or resolution, it just worked.
Valve should probably change the default runtime to Proton instead of the Linux Runtime for this game, if they did that i would personally mark it as Verified instead of Unsupported.
TDP limited to 7 watt and refresh rate limited to 40. I have between 3 and 4 hours of play time on a full charge.
The text above characters when exploring is a little to small
The game doens't detect the inputs from the Steam Deck when using the default version of Proton. Using Proton experimental has fixed this problem.
Use of Proton Experimental The game doen't detect the inputs of the steam deck with the default version of Proton
TDP limited to 7 watt and refresh rate limited to 40. I have between 3 and 4 hours of play time on a full charge.
The text above the characters when exploring is a bit too small.
As I said, the game does not read the Steam Deck entries with the default version of Proton.
600p resolution with fsr, medium settings and 40hz refresh rate(from steam not in-game limiter!)
Plays great on Proton