qmk/qmk_firmware

[Bug] `50-qmk.rules` Broken on systemd 258.

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#25847 opened on Dec 2, 2025

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bughelp wanted

Description

Describe the Bug

A change to systemd with version 258 seems to have broken a lot of people's udev rules, and now the provided udev rule file no longer works. I managed to solve this issue by finding someone in a similar situation and using their fix, but I don't know enough about udev rules or how things are supposed to work to propose a PR with this fix or any other potential fix. All I know is it seems this change by systemd is intentional and not being reverted anytime soon, so I thought to bring it up and hopefully help others avoid the headache I just spent all day figuring out.

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Link to product page (if applicable)

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Operating System

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qmk doctor Output

Is AutoHotKey / Karabiner installed

  • AutoHotKey (Windows)
  • Karabiner (macOS)

Other keyboard-related software installed

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Additional Context

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Contributor guide

Tech stack
None
Domain
devops
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Linux system administrationudev rulessystemd
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate the reported breakage of `util/udev/50 qmk.rules` with systemd v258. Review the Reddit post linked in the issue for a known fix, and understand the systemd change at https://github.com/systemd/systemd/issues/39056. The fix likely involves adjusting the udev rule to comply with new systemd behavior. Test the fix on a system running systemd 258 before proposing a PR. The specific file to modify is `util/udev/50 qmk.rules`.