LinuxVR_Adventure/lvra.gitlab.io
1
0
Fork 0
Code Issues 3 Pull Requests 10 Actions Packages Projects Releases Wiki Activity

Merge branch 'main' into 'main'

Browse Source 
Document Direct Display Mode/Wired HMDs on Intel Arc GPUs.

See merge request lvra/lvra.gitlab.io!142
This commit was merged in pull request #147.
This commit is contained in:
hypevhs
2025-09-23 01:16:51 -05:00
parent 4714d56058 5957c211b2
commit 6dd4d1b863
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
content/docs/hardware/_index.md
View File

@@ -26,6 +26,9 @@ title: VR Gear & GPUs
**Notes:**
- **Nvidia Wired VR Workaround**: Wired users should certainly set `XRT_COMPOSITOR_USE_PRESENT_WAIT` to 1 which changes the swapchain to explicit sync behavior and `U_PACING_COMP_TIME_FRACTION_PERCENT` to 90, representing 90% of the time it takes to render a frame can significantly reduce the latency effect with Nvidia GPUs. There are notable frametime issues in the driver still which may result in stutter but this should vastly improve the experience.
- 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/)
- Wired HMDs on Intel Arc GPUs: Only DisplayPort-based HMDs work, only with i915 driver. Tested: A580, A770 with HP Reverb G2 (OK), Acer AH101 (FAIL).
- Direct Display Mode doesn't work with HDMI-based HMDs.
- Xe driver currently doesn't support Direct Display Mode at all.
- Audio over DisplayPort is known to temporarily cut out whenever 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).
- This fix's default values adds a lot of audio latency to the entire system. If you're someone who is sensitive to audio latency, you can try changing period-size=64 and headroom=512. If audio continues to cut off, double these values.
- Also, this fix will change the latency of _all_ audio output devices. To tweak the audio output latency of your HMD _only_, which is usually sufficient to prevent cutouts, use `pactl list sinks` to identify the Sink Name that your HMD is currently connected to, and edit the headroom fix file by changing the `node.name`.