Known Issues

iRacing

Set DepthLayerExtensionEnabled to 0 in your iRacing OpenXR ini file.

iRacing is one of very few games that submits depth; this has uncovered bugs in various OpenXR runtimes, including:

  • overlays obscured by cockpit (Meta Link)
  • IPD issues (Vive Focus 2 on SteamVR)
  • performance (various)
  • ‘watery’ artifacts (various)

If you are affected by an issue which is resolved by DepthLayerExtensionEnabled=0, contact your runtime vendor (usually your headset manufacturer) for support.

Meta introduced a firmware change in late 2025 which triggers this issue; the next version of OpenTabletDriver (v0.6.7) is expected to include a workaround.

For now, your options are:

  • use Air Link, Virtual Desktop, Steam Link, or another alternative.
  • use your vendor-provided drivers instead; wintab-adapter is recommended.
  • use a prerelease build of OpenTabletDriver.

Crash or error on NVidia 591+ drivers with USB or virtual monitors

See the dedicated documentation for this issue.

Severe performance issues with Pimax headsets on AMD graphics cards

This affects all OpenXR overlays (e.g. OpenKneeboard, RaceLabs VR, OpenXR Toolkit’s menus).

This is a Pimax issue, and can only be fixed by Pimax; contact Pimax for support.

Problems when using XRNeckSafer

XRNeckSafer has several bugs that can cause crashes or other issues in software that uses OpenXR correctly, but not in the specific ways that XRNeckSafer expects.

These are not OpenKneeboard issues; you can:

Degraded performance when system capacity is exceeded

OpenKneeboard is extremely efficient, but it does need some GPU and CPU resources; if you are exceeding your systems capabilities already, adding any additional software will make it disproportionately worse.

In practice, this mostly seems to be an issue for people playing iRacing; common causes include:

  • reaching GPU thermal limits, even without OpenKneeboard
  • reaching GPU power draw limits, even without OpenKneeboard
  • exceeding VRAM capacity, even without OpenKneeboard - especially if adding additional liveries/paint jobs in iRacing, e.g. via Trading Paints

You need to lower your settings to avoid exceeding your systems’ capabilities.

Various positioning issues with Varjo Base

All known issues in Varjo Base affecting OpenKneeboard were fixed in v4.14 (December 2025).