Bigscreen Beyond Driver #

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

use a Proton version >=10 that has access to PROTON_ENABLE_HIDRAW env var; Proton Experimental [bleeding-edge] works well
set PROTON_ENABLE_HIDRAW=0x35BD/0x0101 %command% as your launch arg for the Bigscreen Beyond Driver under Properties
OPTIONAL: download/copy a SteamVR Windows install somewhere and when the driver is open, set the SteamVR path to where you placed the Windows install of SteamVR

The “Bigscreen Beyond Driver” and most of its features should be working fine after doing the above!

Note that currently firmware updates do not work.

Download Windows SteamVR via SteamCMD #

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

Download SteamCMD
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.

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

Easier Device Mode Swapping #

You can also swap modes more easily without using the “Bigscreen Beyond Driver” if your device is set to 75hz mode via XRT_COMPOSITOR_DESIRED_MODE for an Enivison profile.

XRT_COMPOSITOR_DESIRED_MODE=0 is the 75hz mode
XRT_COMPOSITOR_DESIRED_MODE=1 is the 90hz mode

You can verify which modes are which by using a tool like xrandr with the HMD plugged in. The top two modes are the relevant ones used here and are listed in order, starting at an index of 0.