Unable to start injection with Python 3.14

After upgrading to Fedora 43 I am unable to run input-remapper. It looks like the injections cannot be started. I tried creating a new preset to see if that would start and had the same issue.

Share some logs please:

input-remapper-control --version
input-remapper 2.1.1 https://github.com/sezanzeb/input-remapper
python-evdev 1.9.1
which linux distro (ubuntu 20.04, manjaro, etc.)
Fedora 43 Prerelease
echo $XDG_SESSION_TYPE
wayland
which desktop environment (gnome, plasma, xfce4, etc.)
gnome 49.rc
sudo ls -l /proc/1/exe
lrwxrwxrwx. 1 root root 0 Sep 18 08:36 /proc/1/exe -> /usr/lib/systemd/systemd
paste the affected preset .json file from ~/.config/input-remapper-2/presets

Close tab.json

sudo pkill -f input-remapper-service && input-remapper-gtk -d, apply the preset and hit your key. Then share that log.
remapper_output.log
sudo evtest while the previous command is running, to see how events are injected. Devices starting with input-remapper ... are of interest.
no output when Applying preset or hitting the mapped button afterward

evtest_output.log

Fedora 43 use Python3.14, this is the problem 😕
Also not work for me…
Please fix this 🙏

Thx!

@sezanzeb

Judging by the logs and according to this:
https://docs.python.org/3/whatsnew/3.14.html#changes-in-the-python-api

this is what needs to change:
https://docs.python.org/3/library/multiprocessing.html#multiprocessing-programming-forkserver

@sezanzeb, how's your spare time these days?

So we just have add this above the Injector class (or wherever, somewhere where we can find it later, so I suppose this is a good place) to make it work? Could someone with python 3.14 please verify if that works?

multiprocessing.set_start_method('fork')

class Injector(multiprocessing.Process):

(inputremapper/injection/injector.py)

Or maybe in __init__ of Injector, because I dislike imports that do weird things, even though nothing was called yet.

Fix is in #1184, could someone please install from that branch to check if it works? (I don't know how that is ideally done in Fedora, I suppose you have to uninstall it first and then use the instructions at the bottom of the readme, checking out to the python314_fix_tests branch https://github.com/sezanzeb/input-remapper?tab=readme-ov-file#other-distros)

I tested it on Fedora Silverblue 43 like this; it works! No need to uninstall it first.

git clone https://github.com/sezanzeb/input-remapper.git
cd input-remapper
git checkout python314_fix_tests
sudo ostree admin unlock
sudo python3 setup.py install

Thank you!

You might have installed input-remapper on your system twice now though. sudo find /usr -iname "*input*remapper*" can help you to uninstall stuff

I use Fedora Silverblue, an immutable system. /usr is read-only. ostree admin unlock creates a temporary r/w overlay, for testing only. After a reboot, the modifications are gone.

It's different in traditional Fedora Workstation.

@sezanzeb

@sezanzeb I was able to reinstall from this branch and the fix worked for me, thanks!

In Fedora 43 (Beta, Daily) works fine now!

sudo dnf install python3-evdev gtksourceview4 python3-devel python3-pydantic python3-pydbus python3-psutil 
 
git clone https://github.com/sezanzeb/input-remapper.git
cd input-remapper
sudo python3 setup.py install
sudo systemctl enable --now input-remapper`

👍

In Fedora 43 (Beta, Daily) works fine now!

sudo dnf install python3-evdev gtksourceview4 python3-devel python3-pydantic python3-pydbus python3-psutil 
 
git clone https://github.com/sezanzeb/input-remapper.git
cd input-remapper
sudo python3 setup.py install
sudo systemctl enable --now input-remapper`

👍

Does something like

input-remapper-control --list-devices

work for you (on F43)? There still seems to be a problem with pydantic, i.e. the usage of V1 core functionality. V1 is not going to be ported to python 3.14 as per pydantic upstream. (I know this issue is specifically about injection, but since we have testers here ...)

In Fedora 43 (Beta, Daily) works fine now!
sudo dnf install python3-evdev gtksourceview4 python3-devel python3-pydantic python3-pydbus python3-psutil 
 
git clone https://github.com/sezanzeb/input-remapper.git
cd input-remapper
sudo python3 setup.py install
sudo systemctl enable --now input-remapper`
👍
Does something like
input-remapper-control --list-devices
work for you (on F43)? There still seems to be a problem with pydantic, i.e. the usage of V1 core functionality. V1 is not going to be ported to python 3.14 as per pydantic upstream. (I know this issue is specifically about injection, but since we have testers here ...)

That didn't work for me:
input-remapper-control --list-devices /usr/local/lib/python3.14/site-packages/inputremapper/configs/input_config.py:30: UserWarning: Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater. from pydantic.v1 import BaseModel, root_validator, validator ERROR: Did not find any input device

V1 is not going to be ported to python 3.14 as per pydantic upstream

Thanks for mentioning. Tracking this in #1190

Thanks for the fix all, working great from HiImJake instructions.

@sezanzeb

Thank you!

You might have installed input-remapper on your system twice now though. sudo find /usr -iname "*input*remapper*" can help you to uninstall stuff

@sezanzeb can you tell us how would be the proper way to install it without duplicating it?

First uninstall the system one, then install it from git.

I'll probably switch to meson soon btw

Released: https://github.com/sezanzeb/input-remapper/releases/tag/2.2.0

Works just fine, thanks

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Unable to start injection with Python 3.14 #1163

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Unable to start injection with Python 3.14 #1163

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IzsakiRobi commented on Sep 20, 2025

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