Wayland Cursor Lag: A (somewhat long) rant (gist.github.com)

submitted 4 months ago by [email protected] to c/[email protected]

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[-] [email protected] 2 points 4 months ago* (last edited 4 months ago)

I don't understand the setup. Please explain what the raspberry pi pico and an LED have to do with this...

[-] [email protected] 4 points 4 months ago* (last edited 4 months ago)

The pi is either emitting a mouse move or detecting one on the physical device and measuring the time that passes until the photo diode/resistor (not an led) is detecting the cursor to move away.

It's essentially the same setup you would use to detect input to photon latency if you don't have a high speed camera.

Edit: Ah no there's another setup with a pi pico in there... Yeah it's binding and LED Lighting up to a button press to have two visual indicators (LED and Cursor Reaction) you can measure using a high speed camera. Them only having a 90fps phone camera makes it means the measurements are only in 11ms increments though.

[-] [email protected] 1 points 4 months ago

will try again with a photodiode instead, since it's known to be a valid way to measure stuff like this, and it seems precise enough at that

if it isn't this, then I'll probably have to dig into libinput or something

this post was submitted on 25 Jan 2025

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