@thinlysliceddan said in SNES Mouse Sensitivity too fast!:

Is there anything else you you can think of trying?

I tried to find a method to control the mouse acceleration without a desktop env, but didn't find one. All methods (on Linux) to control the sensitivity use either xset or xinput to control it, but they only work under Xorg/a desktop environment.
Other than installing the desktop and trying to run the game from there, I don't have other ideas.

Thanks for the responses so far. An update on this issue: I gave the analog settings in Retroarch a try but they had no impact on the sensitivity.

I decided to go back and dig deeper into mouse polling. I came across more information about mouse polling in Linux: https://wiki.archlinux.org/title/Mouse_polling_rate#Polling_rate_and_polling_interval

I added usbhid.mousepoll back to the boot config file, set the GRS spinner to pulse at 512, and did some testing. Without that command or when I set it to value 0 (system use polling rate requested by device), my spinner runs slow. When I force the system to poll at either 1, 2, 4, or 8, the spinner runs at a much faster speed. The spinner moved at the same speed with all four values, so I left it on 8 to save CPU cycles on the Pi.

I set MAME sensitivity according to the formula (14%) and the blaster now free spins at the familiar speed. I can also properly adjust Major Havoc. Interestingly when I do a 5-space full turn test, a full turn with the GRS is exactly 10 spaces. The blaster isn't moving twice as fast; the blaster clicks at the same speed as this guy's setup with a turbotwist:

I wonder if the GRS is reporting a half turn as a full turn.

In any case, I'm willing to call this issue resolved to my satisfaction.

Just to give a conclusion to the thread, I tried a whole bunch of stuff. I tried jscal, evdev-joystick, updating the kernel, downloading some different files... but ultimately, this is what worked:

https://retropie.org.uk/forum/post/227102

I installed hid-nintendo as described in the post and everything just worked like it was supposed to after rebooting the machine. It makes you reconfigure the controller, but after that, it just works.

Turns out that the dead zone was set too high.
When the joystick finally tilted out of the dead zone it had gone too far for the smaller motions. I set it to almost nothing in comparison to what it was and now everything is nicer to play.

Sorry, forgot: I am on RetroPie 4.1.8