Bigscreen Beyond#

Kernel Patch#

While the Bigscreen Beyond is supported well on Linux, you may need to patch the kernel depending on your GPU vendor.

• NVIDIA
  • Driver 580+ open kernel modules
• AMD
  • Kernel <= 6.14
  • Kernel >= 6.15

There is a general guide to kernel patching at the bottom of the hardware page.

Bigscreen Beyond Driver#

You can get the “Bigscreen Beyond Driver” app from Steam working via Proton by following these instructions:

1. Use a Proton version >=10 that has access to PROTON_ENABLE_HIDRAW env var; Proton Experimental [bleeding-edge] works well.
2. Set PROTON_ENABLE_HIDRAW=0x35BD/0x0101 %command% as your launch arg for the Bigscreen Beyond Driver under Properties.
3. Install the udev rules as mentioned below.
4. OPTIONAL (won’t actually do anything): Download/Copy a Windows install of SteamVR somewhere, then set the SteamVR path to the location of the Windows install of SteamVR. If you don’t have a Windows version of SteamVR downloaded, you can download it through SteamCMD through the steps below

Currently eye camera firmware loading & updates don’t work (see below for info on getting eyetracking working), but HMD firmware updates do work.

Download Windows SteamVR via SteamCMD#

You can easily download the Windows version of SteamVR via SteamCMD. To do this:

1. Download SteamCMD
2. Run this command somewhere you can create directories (i.e., your home directory):

mkdir steamvr_win && steamcmd +@ShutdownOnFailedCommand 1 \
   +@sSteamCmdForcePlatformType windows \
   +force_install_dir $(realpath steamvr_win) \
   +login anonymous \
   +app_update 250820 validate \
   +quit

This will:

• Create a directory in the current directory named steamvr_win.
• Download and validate Windows SteamVR into it.

Your home directory is accessible under Z:\home by default in Proton.

Easier Device Mode Swapping#

While under Linux the “Bigscreen Beyond Driver”’s display refresh rate is unable to be changed, you can still change it under Monado using the XRT_COMPOSITOR_DESIRED_MODE environment variable. Setting it to 0 will keep the mode as it is, while setting it to 1 alternates it as seen by the table below.

• Device is currently on 75hz mode
  • XRT_COMPOSITOR_DESIRED_MODE=0 sets the headset to 75hz mode
  • XRT_COMPOSITOR_DESIRED_MODE=1 sets the headset to 90hz mode
• Device is currently on 90hz mode
  • XRT_COMPOSITOR_DESIRED_MODE=0 sets the headset to 90hz mode
  • XRT_COMPOSITOR_DESIRED_MODE=1 sets the headset to 75hz mode

It is then possible to verify the mode using your DE/WM’s tooling (such as xrandr for X11-based compositors), or by using drm_info -j | jq ".[].crtcs.[].mode.vrefresh" to show all connected monitor refresh rates.

Adjusting Software IPD#

The Bigscreen Beyond Utility’s IPD adjustment does not work under wine/Proton.

If you have a windows installation, the easiest way to adjust the value is to boot into that & set it from the Utility.

If you use monado, there is a pending merge request which adds an LH_OVERRIDE_ICD_MM environmental variable for you to set your IPD value to.

If you use envision, set your profile’s XR Service Repo to https://gitlab.freedesktop.org/Beyley/monado.git, XR Service Branch to vp2-distortion, and an LH_OVERRIDE_ICD_MM=<YOUR_IPD> environmental variable, and then rebuild the profile.

Via lighthouse_console#

Very advanced users may use the lighthouse_console CLI program in ~/.steam/steam/steamapps/common/SteamVR/tools/lighthouse/bin/linux64/ to directly update the headset config with their desired IPD. Exact instructions are not included here on purpose.

Make sure to keep a local & offsite backup of your config before editing it if you try this.

Do not attempt this unless you understand the process & risks, which may include sending your headset back to Bigscreen for repairs.

udev Rules#

Depending on your use case, you may need udev rules for full functionality.

On regular distros, run this script as your regular user, not root. This creates a udev rules file, setting their GROUP fields to one your user is in so you have access to the devices, then it tells udev to apply the rules.

export udev_group=$(groups | tr ' ' '\n' | grep -E "$(whoami)"'|wheel|sudo|adm|admin|video|plugdev' | head -n 1)
sudo tee "/etc/udev/rules.d/99-bigscreen-beyond.rules" > /dev/null <<EOF
# Bigscreen Beyond
KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0101", MODE="0660", GROUP="${udev_group}"
# Bigscreen Bigeye
KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0202", MODE="0660", GROUP="${udev_group}"
# Bigscreen Beyond Audio Strap
KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0105", MODE="0660", GROUP="${udev_group}"
# Bigscreen Beyond Firmware Mode?
KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="4004", MODE="0660", GROUP="${udev_group}"
EOF

sudo udevadm control --reload && sudo udevadm trigger

If your headset is already plugged in, disconnect & reconnect it to force the rules to fire.

On NixOS, use the following option, where you replace the PLACEHOLDER with the first group your user has from this list (You can list your groups with the groups command in the terminal): wheel, sudo, adm, admin, video, plugdev

services.udev.extraRules = ''
  # Bigscreen Beyond
  KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0101", MODE="0660", GROUP="PLACEHOLDER"
  # Bigscreen Bigeye
  KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0202", MODE="0660", GROUP="PLACEHOLDER"
  # Bigscreen Beyond Audio Strap
  KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0105", MODE="0660", GROUP="PLACEHOLDER"
  # Bigscreen Beyond Firmware Mode?
  KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="4004", MODE="0660", GROUP="PLACEHOLDER"
'';

For some even more special use cases (such as using with libsurvive), you may need a more permissive udev rule. If you do, use the following udev rule. You will also need to be part of the wheel group.

KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", MODE="0660", GROUP="wheel"
SUBSYSTEM=="usb", ATTRS{idVendor}=="35bd", MODE="0660", GROUP="wheel"

Bigscreen Beyond 2e Eyetracking#

For details on setting up eye tracking, please see the Baballonia Eye/Face Tracking guide, but you will need to use BSB2e-specific forks, see below.

The full stack can be pictured as such:

graph TB
   E[Bigscreen Beyond 2e]-->F
   F[Bigscreen Bigeye]-->B
   E-->M[Monado]
   M-->X[xrizer]
   X-->D
   B[Baballonia.Desktop/bsb2e_linux] --> C[VRCFT.Avalonia] --> D[VRChat/etc.]
   subgraph Linux Native
   B
   C
   E
   F
   M
   X
   end
   subgraph Proton/Wine
   D
   end

You’ll have better luck currently with the bsb2e_linux fork of Baballonia and its README. It uses libuvc to get around the v4l issues we have with the Bigeye cameras.

Baballonia.Desktop can be given the Bigscreen Bigeye (video0) endpoints for each camera if you’re using the bsb2e_linux fork. You’ll need to adjust cropping and brightness for the cameras as necessary, but it should allow you to easily select the whole left/right areas automatically for the Bigeye in particular.