Lighthouse 2.0 only works on channel 2 using Pimax HMD as BT receiver

[neelrock]

Hello,

I'm pairing valve index knuckles to use them with a PSVR2 using a Pimax 5K+ HMD as BT receiver (no VR dongle) and 2x LH 2.0.

When using the knuckles natively with the Pimax HMD both LH work correclty, one on channel 1 and the other on channel 2. For both LH steamVR reports their position is detected and fpsVR reports "Running OK" for both LH.

Then when using the knuckles with the PSVR2 only the LH on channel 2 reports OK in steamVR or fpsVR. For the 2nd LH steamVR reports "this LH cannot detect a device. Check the device is visible by your headset" (translated from french) and fpsVR reports "running out of range" for this LH.

I have tried all the 16 channels using the button at the back on the LH but can't make both LH work correctly. I can make both LH work correctly individually if I set them to channel 2, so the issue shouldn't come from the LH. Once I want to use both LH and need to set the 2nd one to another channel than 2 then this LH have the issue reported above.

Everything has up to date fw/version (steam/steamVR/LHs, Knuckles, Pimax HMD). The 2 LH are set at opposite corners, 4.5 meters from each other, 1.9m height. Pimax HMD put in the middle, visible by both LHs and by the knuckles. I have not tried yet to link the 2 LHs with the cable (need to find it back). Not sure this would help.

edit: It may not be related to channel number as I now have the LH using channel 1 working OK and the one using channel 2 has the "running out of range" issue

edit2: in steamVR space I only see one LH, and LH visibility just switched to the other one (opposite corner) as I was using the PSVR2 HMD with the knuckles paired, right after calibrating both in Space calibrator. Also in space calibrator I only have one LH in the right dropdown list (target space). But a LH also appears in the left dropdown list (reference space).

Any idea ?