"Hmd Not Found Presence Failed (126)" (Linux)

[Beamboom]

When I try to start Alyx - from within VR Home and obviously with my VR set active and working, I get a "Hmd Not Found Presence Failed (126)" error message in a window on my desktop.

OS: Ubuntu 19.10
SteamVR version: 1.11.12
VR set: Valve Index

All other games work, I can start them and exit and try Alyx again - same message.

When googling I have found strangely few others with this problem, so I got a feeling it's something obvious I've not thought of...

Anyone have a suggestions?

[Beamboom]

Thanks for your reply, tℨopc!

tℨopc a écrit :

In any case, it looks like there's at least two situations that produce this problem https://github.com/ValveSoftware/SteamVR-for-Linux/issues/95

Yeah I had read that one but it was not relevant for me, unfortunately.

But! Upon trying your excellent advice (stupid of me to not have done that already) to start Steam via terminal, the game now all of a sudden just worked. Started instantly, no error messages or hiccups whatsoever.

And I have zero idea why.

I'll have to investigate this one further and see if it now also runs outside of being started via the shell (I fully expect it to...!) but this is one weird case. And it's not like the system just needed a reboot after an upgrade or something - I've tried several times over several days.

[Beamboom]

Well I always started Alyx from the Steam client, it was the Steam client ITSELF I started in the terminal.

And the game runs perfectly now, also when Steam is not started from the shell - as I totally expected it to. But WHY? No idea.

But hopefully maybe theoretically someone else can find this thread of interest sometime down the road, should they google it like I did. :)

[Azgana]

Hi guys, I've recently bought a Meta Quest 3 VR headset, and my first game is obviously Half Life: Alyx.
For now, I've "only" a Fritz! Box 4040 router, 2.4 GHz, but everything works fine, even if I know that a 5 ghz router is the requirement.
But the problem is another: since I bought the headset, I have played in every possible way: via Steam Link wirelessly, via Quest Link wirelessly and via USB 3.0 cable.
I've noticed that the best way, with the best quality/fluidity, is to play via Quest Link and I've done so in the last two gaming sessions, without any problems. At a certain point then, I received this error:

"vriniterror_init_hmdnotfound presence failed error 126".

I tried restarting the PC, connecting the headset via USB cable (I had read this solution from a user who had the same problem), but nothing, the message now appears every time I start the game with these steps: -> launch Quest Link -> Monitor 1 -> Steam -> Half Life Alyx.

What happened?

[El Roald]

Azgana a écrit :

Hi guys, I've recently bought a Meta Quest 3 VR headset, and my first game is obviously Half Life: Alyx.
For now, I've "only" a Fritz! Box 4040 router, 2.4 GHz, but everything works fine, even if I know that a 5 ghz router is the requirement.
But the problem is another: since I bought the headset, I have played in every possible way: via Steam Link wirelessly, via Quest Link wirelessly and via USB 3.0 cable.
I've noticed that the best way, with the best quality/fluidity, is to play via Quest Link and I've done so in the last two gaming sessions, without any problems. At a certain point then, I received this error:

"vriniterror_init_hmdnotfound presence failed error 126".

I tried restarting the PC, connecting the headset via USB cable (I had read this solution from a user who had the same problem), but nothing, the message now appears every time I start the game with these steps: -> launch Quest Link -> Monitor 1 -> Steam -> Half Life Alyx.

What happened?

same issue my guy

[Azgana]

I found a simply workaround to solve the problem.

If you do these passages:

Launch Quest Link -> Monitor 1 -> Steam -> Steam VR -> launch Half Life Alyx

the error message doesn't appear and the game, for now, always work.

Launching directly Half Life Alyx, without before launching Steam VR, makes the error verify.