Linux triple monitors suddenly stopped working!

[rivergum]

Hi all, I am running Euro Truck Simulator on my Linux system with three 1920*1080 monitors. I have been enjoying the wide-open scenery vistas across triple monitors for the last couple of years.

Unfortunately, an update in the last two weeks has broken something. Now when I start ETS it recognises only the left-hand monitor. I can see only the left-hand side of the SCS logo splash screen (the “tink!” sound), followed by the left-hand side of the the ETS splash screen (with the revving engine sound). I think the game is creating a 5760*1080 image, but only the left-hand third of the image is reaching a monitor. The centre and right-hand monitors continue to show the desktop.

I have not changed any hardware or changed the system configuration in the last two weeks. The only changes are either ETS game software updates or Linux package software updates. I note that ETS v1.50 included “Improvements in the Rendering System”; could those changes have created this problem?

The only clue I can find is a message in the “game.log.txt” file:
00:00:01.674 : <ERROR> [x11] xlib: Failed to find compatible fullscreen mode: 5760 x 1080 (0 Hz)
00:00:01.682 : [win] new windowed size: 1920 1080
...but I don’t know what (if anything) this message signifies. Xrandr reports a single wide screen:
Screen 0: minimum 8 x 8, current 5760 x 1080, maximum 32767 x 32767

My system summary: Linux Mint 20.3 Una; AMD Ryzen 3600; Nvidia GeForce RTX 4070, currently on 550.54.14 driver. Disabled all ETS mods. uset r_multimon_mode "2".

Is this the right forum for technical questions? If not, could you please let me know where to ask? What can I do to restore triple-monitor behaviour for ETS on a Linux system?

Detailed system information may be found here: https://pastebin.com/0PrPB1TL

[Potzblitz]

It's a known issue since 1.50. Game window doesn't run in exclusive fullscreen mode anymore. You can try to workaround with Gamescope. More information: https://forum.scssoft.com/viewtopic.php?t=328452

[Potzblitz]

There is another way you can try:

1. Set r_fullscreen "0" in config.cfg

2. Deactivate/Auto-Hide taskbar

3. Set center monitor as primary in desktop monitor settings. This setting can differ, if the game window is shifted by 1 monitor width then maybe you have to set left monitor as primary.

4. Deactivate game window title bar by executing following command:

xprop -name 'Euro Truck Simulator 2' -f _MOTIF_WM_HINTS 32c -set _MOTIF_WM_HINTS "0x2, 0x0, 0x2, 0x0, 0x0"

Now you should have a borderless full screen game window. To not always type in xprop command, you can create a keyboard shortcut for it.

[Wolfpig]

Originally posted by Potzblitz:

Now you should have a borderless full screen game window..

Since 1.50 the game runs in a borderless fullscreen window.....which is the cause of his problem.....(at least partially)

[Potzblitz]

Originally posted by Wolfpig:

Originally posted by Potzblitz:

Now you should have a borderless full screen game window..

Since 1.50 the game runs in a borderless fullscreen window.....which is the cause of his problem.....(at least partially)

If you start the game with r_fullscreen "0", you get the full 5760 x 1080 game window spanned over all 3 monitors (at least native Linux version, Proton is another thing), but with top window bar decoration which you have to deactivate together with auto-hide taskbar.

That's what i mean with "borderless full screen window" in this particular case.