Virtual Display Daemon for Fedora

virtual-display Is a Daemon and CLI tool for fedora to enable a virtual display on an empty connector. This leverages the kernel debug sys paths to set an EDID on an empty connector.

It is available on copr or you can build from source (cargo build).

Also it's experimental and might break on updates!

There must be an empty connector available on the system

To display connectors info run:

for connector_path in /sys/class/drm/*/status; do
    if [[ "$(cat "$connector_path")" == "unknown" ]]; then continue; fi
    status=${connector_path%/status}
    connector_name="${status#*/card?-}: "
    echo -n " $connector_name"
    cat "$connector_path"
done

Or run virtual-display status after install.

This should display the following info for your system. If there are no disconnected connectors, this tool is not going to work.

 DP-1: connected
 DP-2: disconnected
 DP-3: disconnected
 HDMI-A-1: connected

Usage: virtual-display <COMMAND>

  status   Get status
    --json  Print json

  daemon   Run daemon commands
    start  Start the daemon (systemd)
    stop   Stop the daemon (systemd)

  enable   Enable virtual display
    -c, --connector <CONNECTOR>  Name of the display connector

  disable  Disable virtual display

Example implementation

Check my before-stream.sh script that uses this tool to stream from a 4k virtual display to my tv with Sunshine.

Fedora copr

https://copr.fedorainfracloud.org/coprs/pvermeer/virtual-display