Debian: Works on GNOME but not an alternate window manager (StumpWM)

[tsmacdonald]

Hello, I have a brand new install of Debian testing. Installing displaylink-debian went fine, and on GNOME everything is working as expected with my internal laptop screen and two external monitors (both connected to the same hub). Here's my debug output (not the number of xrandr providers is 0).

Click for debug output on GNOME

--------------- Linux system info ----------------

Distro: Debian
Release: trixie
Kernel: 6.11.7-amd64

---------------- DisplayLink info ----------------

Driver version: 1.14.7
DisplayLink service status: up and running
EVDI service version: 1.14.7

------------------ Graphics card -----------------

Vendor: i915
Subsystem: [103c:8b41]
VGA: Intel Corporation Raptor Lake-P [Iris Xe Graphics] (rev 04)
VGA (3D): 
X11 version: 21.1.14-1
X11 configs: /etc/X11/xorg.conf.d/20-displaylink.conf /etc/X11/imwheel/startup.conf

-------------- DisplayLink xorg.conf -------------

File: /etc/X11/xorg.conf.d/20-displaylink.conf
Contents:
 Section "Device"
    Identifier  "Intel"
    Driver      "intel"
EndSection

-------------------- Monitors --------------------

Providers: number : 0

However, when running StumpWM instead of Gnome, only the internal laptop screen works. arandr doesn't see the external displays. I've already tried reinstalling displaylink-debian from under StumpWM, so I'm not quite sure what to do next.

I'll post the debug output here in a second (I need to log out and log back in).

[tsmacdonald]

Duplicate of #973, sorry