19 Dec 2019 by demon36  tech_tips

Fix twin usb joysticks detected as one on linux

recently I got some cheap usb twin joysticks with no brand, tried them with MAME but they seems to show up as a single joystick. checked available devices but found only /dev/input/js0 to be present and ofc jstest-gtk is only showing a single device.

after some research it appeared that there are some linux patches that fix the problem but they have not made it to the kernel I use yet -4.19.0 in my case-

found a solution that works here, the steps are: 1. get usb device vendor id and product id via lsusb

mine showed up like "0810:e301 Personal Communication Systems, Inc." so vid is 0810 and pid is e301 2. add special handling for the kernel via sh echo "options usbhid quirks=0x0810:0xe301:0x00000040" | sudo tee -a /etc/modprobe.d/usbhid.config ofc replace vid and pid with yours 3. regenerate initramfs via sh sudo update-initramfs -u 4. reboot your machine 5. assert is work by checking out that /dev/input directory has js0 and js1 files -this can change if you have other joysticks pugged in-

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