Raspberry Pi 400 polling issues with keyboard and mouse, responsiveness is crummy

Despite many glowing reviews out there of the Raspberry Pi 400, there is a usability problem (in a daily-driver sort of way) that is getting little attention so far. In a nutshell:

These issues (missed clicks, desync position vs clicks) could be explained if the OS was polling mouse input, rather than using buffered mouse input.

Active threads on this:

  1. From the Raspberry Pi forums:
  1. On reddit:
1 Like

From your links, possibly a config fix for the mouse,

Oh, looks like indeed the Pi is polling for mouse by default. (lol)

Setting usbhid.mousepoll=0 in /boot/cmdline.txt fixes the issue.

I was not able to find a similar option to fix up keyboard. Does anyone know if there is a way to fix the keyboard buffering on the Pi400?

/u/trejj, https://www.reddit.com/r/raspberry_pi/comments/ki2tbb/raspberry_pi_400_an_utterly_unusable_catastropic/

Keyboard unlikely to have one.

What I found with that one was that my keypresses had to be dead-center to register. I could fully depress the key from along the perimeter of the surface and not have it register.

cspan, https://www.raspberrypi.org/forums/viewtopic.php?f=140&t=291298