Your system information

• Steam client version (build number or date): Built Jul 26 2017 at 18:19:48
• Distribution (e.g. Ubuntu): Xubuntu 17.04
• Graphics driver version (run nvidia-settings): 381.26.08-0ubuntu0~gpu17.04.1
• Gist for SteamVR System Information: https://gist.github.com/JohanAR/bbe49aeea02299a59b62efbdbddd9009
• Opted into Steam client beta?: [Yes/No] Yes
• Opted into SteamVR beta?: [Yes/No] Yes
• Have you checked for system updates?: [Yes/No] Yes
• CPU: i7-4770k
• RAM: 8 GB
• GPU: GTX 970

Please describe your issue in as much detail as possible:

Seems like SteamVR is almost working: I could start room setup and got an image in my headset, but tracking stopped working and after restarting SteamVR I no longer get an image, it's all black. The whole time the process ~/.local/share/Steam/steamapps/common/SteamVR/bin/linux64/vrcompositor takes 100% CPU. Tried starting steam both with and without STEAM_RUNTIME_PREFER_HOST_LIBRARIES=0, works fine in Win10 on same hardware.

Steps for reproducing this issue:

1. Start SteamVR from Steam client
2. Check running processes for CPU usage, for example using htop