Well... I restarted my PC, tried it again and it worked. I guess this is an intermittent issue. Things seem to be working now, for the moment.
I experience this from time to time as well. Sometimes (a bit more rarely though) I only get one lighthouse. Logging off and logging back on is typically enough to change the symptoms.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
BEHAVIOR
After a recent update, I ran the SteamVR beta program, waited for it to load, then turned on my controllers. Both controllers showed green/on lights, but only one was solid green in the SteamVR Status window.
EXPECTED BEHAVIOR
Both controllers turn on and are recognized by SteamVR.
Steps for reproducing this issue: