qmk/qmk_firmware

[Bug] Mouse keys prevent keyboard from starting up when switching inputs using KVM switches

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#15,949 opened on Jan 20, 2022

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bughelp wanted

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Description

Describe the Bug

I had submitted #15939 but, after finding other users reporting issues with KVMs when enabling mouse keys, I see this is a common issue. Even though KVMs used to be a niche thing, people are using them more with WFH and all that, so maybe it's worth taking a look into why that happens.

My understanding is that QMK will present two devices (a keyboard and a mouse) connected through a hub and that is the cause of those issues.

System Information

  • Keyboard: GMMK Pro, JJ50, Planck EZ
    • Revision (if applicable):
  • Operating system: Windows, Linux, macOS
  • AVR GCC version: various
  • ARM GCC version: various
  • QMK Firmware version: various
  • Any keyboard related software installed?
    • AutoHotKey
    • Karabiner
    • Other:

Additional Context

I haven't been able to identify why that could be happening at all. Would appreciate input on where to look, if any bits are suspicious.

Contributor guide

Research direction
Investigate the USB descriptor differences when mouse keys are enabled, particularly how the composite device is enumerated by KVM switches.
Tech stack
c
Domain
embedded iot
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.
1-2 days
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.
Clear
Prerequisites
CGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40