Index: No Audio - Failed to play test tone

[Roencia]

Audio worked once after a computer restart, now it won't play sound and gives ^ this error when testing audio in the sound panel. Tried ejecting USB and re-plugging in/restarts several times. Doesn't work.

[ArcaneLayne]

Had the same issue; the device was there and set as the default, but no sound and that same error when testing. Scanning for changes in Device Manager resolved this for me.

[Roencia]

Thankyou ArcaneLayne, I will give that a try.

[RC-1290]

Try unplugging the break-away box and re-plugging it. That usually works for me.

[VikingAlex]

my solution was using old Vive Link Box beacuse it has its own power supply and maybe your motherboard cant push more POWER in those usb connection.

[RC-1290]

I'm curious VikingAlex, how do you connect it to the linkbox? I don't have a male connector coming from it.

[Thynix]

I had the same problem: I'm on Windows 10 1903, with a GTX 1080, and the Index HMD audio device appeared, but wouldn't produce sound. Right clicking on it in the sound control panel and selecting "Test" prompted a dialog box of "Failed to play test tone."

I don't think scanning for changes in the device manager was part of the solution for me, but I did try it. I think what ended up making the difference was installing the NVIDIA HD audio drivers, then re-enabling the Index HMD device, which had disabled itself upon driver installation. My guess is this is because the HMD audio is going over DisplayPort, which lacked audio drivers?