I've asked once in the main HL2 topic, but received no response so far, so I'll create a thread just for HL2, Linux, and Oculus, and maybe somebody might respond.
According to Valve, HL2 now supports Oculus, and it supports Linux. I am trying to find out if those two sets intersect - is Oculus supported in Linux? So far, I have been unable to get HL2 to give any indication it does.
HL2 runs fine under my Ubuntu 12.04 x86-64 machine, and I've added the "-vr" option on the launch shortcut in Steam, but I can see no way to enable Oculus mode. I've pulled down the Steampipe beta.
I know the Rift itself is working: I can run the Tuscany Demo with no problems, so it's not a permissions issue on the HID device.
I've raised this as a support issue with Valve, but have yet to get a meaningful response from them.
So, can anybody give me any sort of meaningful response? Even a "No, it's not supported under Linux at this time" would be helpful.