Can't run ue 4.19 on a headless ubuntu 16.04

Development Platform & Builds
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1

I’m trying to run ue 4.19 on a headless ubuntu 16.04 without success. My card: 1080ti, nvidia driver: 390.67
I’ve installed ‘xserver-xorg-video-dummy’ and my xorg looks like this:

Section "Module"
    Load    "RANDR"
    Load   "dbe"
    Load   "glx"
    Load   "extmod"
    Load   "type1"
    Load   "freetype"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0    #Virtual monitor needs this
    VertRefresh     43.0 - 72.0    #this, too
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"              #change for AMD or Intel
    VendorName     "NVIDIA Corporation"  #this, too
    Option "NoLogo" "1"                  #also this
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
        Virtual 1920 1080
    Option          "AllowEmptyInitialConfiguration" "True"
    EndSubSection
EndSection

Section "Extensions"
    Option "Composite" "Enable"
    Option "RANDR" "Enable"
EndSection

It works fine, I can connect to the ubuntu via vnc / teamviewer. When I am trying to run ue4 from console I got following erorr:

[2018.06.18-08.36.41:927][  0]LogInit: Initializing SDL.
[2018.06.18-08.36.41:964][  0]LogInit: Warning: Could not initialize SDL: XRandR support is required but not available
[2018.06.18-08.36.41:964][  0]LogInit: Warning: FLinuxSplashState::InitSplashResources() : InitSDL() failed, there will be no splash.
[2018.06.18-08.36.41:964][  0]LogInit: Initializing SDL.
[2018.06.18-08.36.41:992][  0]LogInit: Warning: Could not initialize SDL: XRandR support is required but not available
[2018.06.18-08.36.41:992][  0]LogInit: Error: FLinuxApplication::CreateLinuxApplication() : InitSDL() failed, cannot create application instance.
[2018.06.18-08.36.41:992][  0]LogLinux: FLinuxPlatformMisc::RequestExit(bForce=true, ReturnCode=1)
[2018.06.18-08.36.41:992][  0]LogLinux: FLinuxPlatformMisc::RequestExit(1)

But “xrandr” works from console. I also found following lines in xorg log:

[    19.404] (II) LoadModule: "randr"
[    19.417] (WW) Warning, couldn't open module randr
[    19.417] (II) UnloadModule: "randr"
[    19.417] (II) Unloading randr
[    19.417] (EE) Failed to load module "randr" (module does not exist, 0)
[    20.510] (--) RandR disabled
2

You don’t need X11 server to run headless, the editor should create the context via EGL (provided that you have NVidia binary drivers) and will render into an offscreen framebuffer. This is of course if you want rendering at all - if you don’t need rendering you can pass -nullrhi (UE servers have -nullrhi implied and never require graphics).

I recommend uninstalling the dummy X server because it actually gets into the way - once the engine realizes it has some X server it starts to require particular extensions that the dummy one doesn’t seem to support.

3

Thank you for answer. Where can I find all parameters that can be passed to UE4Editor?
The problem is I still want to have GUI on a server side for visualization. And I want to be able to open editor on a server side when I need to change project. So, I run X11 server on startup. I removed dummy driver, however nothing changed. It still cannot init SDL().

4

I’m facing the same issue. Any luck fixing the issue?