this post was submitted on 16 Aug 2023
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uinput module not loaded automatically anymore (feddit.de)
submitted 2 years ago by MaxGyver83@feddit.de to c/archlinux@lemmy.ml
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I use dwm on Arch and in my autostart.sh I start KMonad. This requires me to be member in the uinput group (what I am). Since a few days starting KMonad fails with:

kmonad: /dev/uinput: openFd: permission denied (Permission denied)

(Same when I try to start it manually.)

The workaround is to run sudo modprobe uinput and then to start kmonad (again).

I just don't understand why this is necessary now. I have this udev rule defined:

/etc/udev/rules.d/90-kmonad.rules:

KERNEL=="uinput", MODE="0660", GROUP="uinput", OPTIONS+="static_node=uinput"

I guess this broke because of a sudo pacman -Syu. Has anything changed in the last few days? I can't find anything that looks related on Arch Linux.

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[–] BaalInvoker@lemmy.eco.br 1 points 2 years ago (1 children)

Looks like your uinput module isn't being loaded at boot

Have you added a file uinput.conf with uinput as its content at /etc/modules-load.d?

[–] MaxGyver83@feddit.de 1 points 2 years ago* (last edited 2 years ago) (1 children)

I have tried this but the problem persists after a reboot.

UPDATE: I have tested this again. I forgot to mention that it's even worse with an /etc/modules-load.d/uinput.conf. After a reboot, I get the same error as before but a sudo modprobe uinput doesn't help anymore. I have to run sudo modprobe -r uinput; sudo modprobe uinput to fix the openFd: permission denied error (temporarily).

[–] BaalInvoker@lemmy.eco.br 3 points 2 years ago (1 children)

Try change your udev rule to

KERNEL=="uinput", MODE="0660", GROUP="uinput", TAG+="uaccess", OPTIONS+="static_node=uinput"

Maybe you don't grant uaccess to your device

I have an uinput device configured as well and my setup is:

KERNEL=="uinput", SUBSYSTEM=="misc", TAG+="uaccess", OPTIONS+="static_node=uinput"

[–] MaxGyver83@feddit.de 3 points 2 years ago (1 children)

This fixes it. Thank you! Do you know why I need TAG+="uaccess" now but didn't need it in the past?

[–] BaalInvoker@lemmy.eco.br 2 points 2 years ago

I have no clue