Public bug reported:

The Steam Controller is about to ship; for native controller support
through the SteamWorks API, keyboard emulation, mouse emulation, having
access to the regular device nodes is enough, but to emulate a game
controller that applications can use through SDL, the user that runs
Steam needs write access to /dev/uinput in order to create a virtual
controller device. This is a pretty critical feature of the controller
and not having it will limit the end-user experience in various ways.

This is already enabled in SteamOS through a udev rule for the 'steam'
account, but we have not flipped that switch across the board in our own
Ubuntu package for Steam, as it could be seen as a security concern.

Ideally the Ubuntu-provided 'steam' package would be set up in such a
way that only the Steam client has write access to /dev/uinput.

** Affects: steam (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1498658

Title:
  Steam Controller support: need read-write access to /dev/uinput for
  controller emulation

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