X-Box Wireless Adapter doesn't show any controllers?

I thought I had this working but something must have happened because my controllers are no longer working.

I have the official Xbox Wireless Adapter plugged into the PC and it shows up correctly with lsusb:

Bus 001 Device 005: ID 045e:02e6 Microsoft Corp. Xbox Wireless Adapter for Windows

...but SteamOS doesn't show any controllers even though it's paired and connected...?
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