SteamVR has been updated with the following changes. This is the same build that appeared in the beta on March 29th.
General:
Removed legacy enableDistortion user preference
Oculus:
Fixed an issue making Touch controller triggers unresponsive during room setup.
Developer:
Always show both Enable and Disable DirectMode buttons in Settings regardless of what mode we think the headset is in.
Desktop Theater:
Added aspect fill option to remove or reduce letterbox effect
Widened virtual screen to better fit wider aspect ratios
Hide UI when not looking at it instead of remaining persistently visible
Fixed timing issue with left/right eyes occasionally being out of sync
Fixed lighting issue in room environment
Linux:
Added preliminary developer support for Linux
This release includes many pitfalls and known issues that are detailed in the new SteamVR for Linux Github repository
Drivers:
Fixed issue with resource paths in drivers
Compositor
Fix aliasing in textures used in SteamVR workshop environments, controllers, and base stations caused by mip maps being disabled