qmk/qmk_firmware

[Bug] Backlight issue with Split Keyboards

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#14,851 opened on Oct 17, 2021

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bughelp wanted

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Description

Split keyboard only turns backlight per-key LEDs of on half that is directly connected to the computer when host system sleeps

Describe the Bug

When the system sleeps, the half of the split keyboard not directly connected to the computer leaves the backlights on.

Quefrency keyboard Rev3 with latest QMK. Host computer sleeps/powers down and the connected half of the keyboard turns off the per-key backlight LEDs. On the other half of the keyboard the backlight LEDs stay lit.

System Information

  • Keyboard:
    QueFrency Rev3
    • Revision (if applicable):
  • Operating system: Windows
  • AVR GCC version: avr-gcc.exe (GCC) 8.4.0
  • ARM GCC version:
  • QMK Firmware version: 0.14.23
  • Any keyboard related software installed?
    • AutoHotKey
    • Karabiner
    • Other:

Additional Context

Contributor guide

Research direction
Examine the QMK backlight code for split keyboards, focusing on suspend and wake events. Check how the slave half's backlight state is managed when the host sleeps.
Tech stack
c
Domain
None
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Clear
Prerequisites
QMK basicssplit keyboard concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55