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Warn Nvidia issued on wired headsets

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@ -5,13 +5,15 @@ title: VR Gear & GPUs
# Hardware
{{% notice warning %}}
**NVIDIA WIRED VR ISSUES**: Nvidia proprietary drivers currently have a critical issue with DRM lease causing substantial presentation latency for wired VR headsets, resulting in a delayed viewport effect that makes VR uncomfortable. This affects all known driver versions. Wireless VR through WiVRn still works well. Users with Nvidia GPUs should consider wireless options or switching to AMD for the best experience. For details and to report your experience, see [this forum thread](https://forums.developer.nvidia.com/t/substantial-drm-lease-presentation-latency-resulting-in-unusable-vr-hmd-experience/332386).
{{% /notice %}}
## GPU support matrix
| Manufacturer | Driver | VR Support | Reprojection Support | Hybrid Graphics Support | Notes |
|--------------|---------------------------|----------------|--------------------------------|-------------------------------|----------------------------------------------------------------------------------------------|
| Nvidia | Nvidia (Closed Source) | Excellent | Excellent | Supported | Requires driver version 565 or greater |
| Nvidia | Nvidia (Closed Source) | ⚠️ Limited | ⚠️ Limited | Supported | Requires driver version 565 or greater. [Critical issue with DRM lease causing presentation latency](https://forums.developer.nvidia.com/t/substantial-drm-lease-presentation-latency-resulting-in-unusable-vr-hmd-experience/332386) makes wired VR uncomfortable. Primarily suitable for wireless VR (WiVRn) only. |
| Nvidia | Nouveau (Open Source) | Functional | Functional | Supported | Lacks DisplayPort audio. |
| Intel | i915 (Open Source) | Functional | Unknown | Supported | Relatively old, most likely poor support for newer GPUs.
| Intel | Intel/Xe (Open Source) | No wired HMDs | N/A / Unable to drive wired. | Supported | Lacks direct mode implementation in driver, unable to drive wired HMDs. |
@ -24,6 +26,8 @@ title: VR Gear & GPUs
- **Reprojection Support**: Describes the support and quality of reprojection features for VR. Poor support indicates that the driver is not able to properly handle Vulkan realtime shaders and it will present as visual stutter. Non-robust solutions will suffer stutter under very high GPU load.
- **PRIME/ Hybrid GPU Support**: Compatibility with systems using multiple GPUs for render offload. Monado and all clients must be run on a single select GPU due to memory tiling requirements.
- For Nvidia proprietary drivers *older* than 565, (please try to update!), the [vulkan-layers](https://gitlab.freedesktop.org/monado/utilities/vulkan-layers) must be installed in order to not crash: [*AUR*](https://aur.archlinux.org/packages/monado-vulkan-layers-git)・[*Fedora*](https://packages.fedoraproject.org/pkgs/monado-vulkan-layers/monado-vulkan-layers/)
- **Nvidia Wired VR Workaround**: Some users report setting `U_PACING_COMP_MIN_TIME_MS` to approximately 10 can slightly reduce the latency effect with Nvidia GPUs, but this is only a partial mitigation, not a solution.
- Nvidia GPUs work well for wireless VR through WiVRn, but have significant issues with wired headsets until the DRM lease presentation latency issue is resolved.
- AMD GPUs lower than RDNA generation have functional but less robust reprojection capabilities, expected to be similar to Intel.
- Audio over displayport is known to temporarily cut out when new audio sources spring up on pipewire [without a fix to add alsa headroom](https://wiki.archlinux.org/title/PipeWire#Audio_cutting_out_when_multiple_streams_start_playing)
- X11 configurations are discouraged but workable, please upgrade your system to Wayland if at all possible.
@ -32,7 +36,7 @@ title: VR Gear & GPUs
## XR Devices
A non-comprehensive table of various VR/XR devices and the drivers that support them.
A non-comprehensive table of various VR/XR devices and the drivers that support them. Note that wired headset experiences with Nvidia GPUs will be affected by the [DRM lease presentation latency issue](https://forums.developer.nvidia.com/t/substantial-drm-lease-presentation-latency-resulting-in-unusable-vr-hmd-experience/332386).
| Device | [SteamVR](/docs/steamvr/) | [Monado](/docs/fossvr/monado/) | [WiVRn](/docs/fossvr/wivrn/) |
|----------------------|:-------------------------------------:|:------------------------------:|:----------------------------:|
@ -92,6 +96,11 @@ A non-comprehensive table of various VR/XR devices and the drivers that support
## Hardware note
- **Nvidia GPU users**: Due to the DRM lease presentation latency issue, wired VR headsets will experience a delayed viewport effect on Nvidia GPUs. This affects all driver versions since 550. Consider these workarounds:
- Use WiVRn or ALVR with standalone headsets for wireless VR (recommended)
- Try setting `U_PACING_COMP_MIN_TIME_MS=10` as an environment variable to slightly reduce the effect
- Consider switching to AMD GPUs for the best wired VR experience
- Monitor the [bug report thread](https://forums.developer.nvidia.com/t/substantial-drm-lease-presentation-latency-resulting-in-unusable-vr-hmd-experience/332386) for updates
- WiVRn PC XR to WiVRn PC client streaming remains mainly for debug use.
- **Vive Pro** microphones should be set to use 44.1khz sample rates as feeding in 48khz raises the pitch of the audio.
- **Vive Pro** creates HDMI Output Source after startup of SteamVR/Monado/etc. Use it instead of Vive Pro USB Audio Source, since the audio might appear distorted.