Analog-stick drift is the single most common reason a used Nintendo Switch, Steam Deck, or ROG Ally gets returned — not a cracked screen, not a dead battery, but a stick that reports movement when nobody's touching it, or ignores movement when you push it to the edge. If you're buying secondhand, this is the one thing worth checking before anything else. The good news: all three devices have a built-in way to see it happening in real time, no tools required.

Nintendo Switch

Every Switch (and every Joy-Con or Pro Controller paired to it) has a hidden input-test screen built for exactly this:

  1. From the HOME Menu, open System Settings.
  2. Select Controllers and Sensors.
  3. Select Test Input Devices, then Test Controller Buttons.
  4. Push each analog stick to its full range of motion and watch the on-screen indicator.

A healthy stick sits dead-center when you let go and moves smoothly with your thumb. Drift shows up as the indicator creeping or jumping on its own the moment you release the stick — that's the failure mode to look for, not just "does it move at all."

Steam Deck

Valve built the same kind of test into Steam's own controller settings:

  1. Press the Steam button, then open Settings.
  2. Go to Controller in the sidebar, then Calibration & Advanced Settings.
  3. Select Joysticks, then press Y to start the live test.

This screen shows the stick's actual position in real time, which makes drift obvious — you'll see the on-screen position move even when the stick itself is sitting untouched.

ROG Ally

Armoury Crate SE has a joystick calibration screen with a live position readout, reachable from the gamepad/controller settings inside Command Center — exact labels have shifted slightly between Armoury Crate versions, so look for Calibrate under the controller or gamepad section rather than a fixed menu path. As with the other two, what you're checking for is the same thing: does the on-screen position sit still and centered when you're not touching the stick.

The harder case: buying shipped, sight-unseen

All three of these checks assume you have the device in your hands. That's fine for a local meetup — it's not fine for the far more common case now, where you're paying for something that's shipping to you, and the seller's word ("works great, no drift") is all you have until it arrives.

That's the actual gap TestPass exists to close. For a Switch, Steam Deck, or ROG Ally listing, TestPass has the seller walk through this exact same on-device test on camera, in a short guided sequence, so you can see the real result — the stick sitting still on the calibration screen, not just a seller's claim — before you commit to buying.

One honest limit worth stating: this check catches the single most common failure mode for these three devices, not a full certification of the whole unit. It's the fast, specific thing to look for — not a substitute for asking about anything else that matters to you.