Describe the bug
I have a HTC Vive. I changed from an NVIDIA GPU to the Radeon 7900XTX. Now I can't get into VR when the headset is connected through the Link Box. If the Link Box is bypassed, then VR works.

To Reproduce
Steps to reproduce the behavior:

1. Make sure the HMD is plugged in through the Link Box
2. Start SteamVR
3. Steam will warn about error 109
4. The SteamVR window will open on the desktop, with the message "Failed to connect to headset display", error code 496
5. Close SteamVR
6. Connect the HMD's 3-in-1 cable's HDMI connection directly to your GPU, not the Link Box
7. Start SteamVR
8. Observe it works.

Expected behavior
The Link Box may be used to route the HDMI connection, and the HMD operates successfully in that case.

System Information (please complete the following information):
Please use the latest Steam beta client and SteamVR beta for your bug reports!

• Steam client version (build number or date): 1720650399 (Wed, Jul 10 6:09 PM UTC -03:00)
• SteamVR version: 2.6.2
• Distribution (e.g. Ubuntu): Manjaro (KDE, kernel 6.8.12-3-MANJARO)
• Steam runtime diagnostics: [generate via Help -> Steam Runtime Diagnostics in the Steam client]
• Steam and SteamVR logs: steam-logs.tar.gz
• Minidumps: steam-minidumps.tar.gz

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context

Got the hint to bypass the Link Box from https://github.com/ValveSoftware/SteamVR-for-Linux/issues/636#issuecomment-1826721825, so it might be a related issue.

I tried this in both X and Wayland sessions of KDE Plasma.

If I run xrandr, then it tracks with when SteamVR can find the headset:

• If going through link box, no HDMI connection in xrandr output;
• If directly on GPU, a HDMI connection appears in xrandr.

It is not a defect of the HDMI cable, I have tried with a spare I have and it also is not detected.