qmk/qmk_firmware

[Bug] RGB pattern fails to light certain keys

Open

#26219 opened on May 17, 2026

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bughelp wanted

Description

Describe the Bug

Of the various RGB displays built into the firmware, one of them has lights that move out from the centre towards the left and right sides. I have a YMDK 15x5 keyboard, which means an odd number of columns. That means the centre column is neither left nor right. Whatever lights happened to be turned on when you activate this display are "stuck" in whatever state they were when you activated this display. I would imagine it's because it does some math to decide if a key is on the left or right, and ignores what happens if it's the centre column. with the result it just looks awful, if not broken, with the centre column lights stuck. The algoritm should be changed and make sure the centre column is either following the left or right pattern, not nothing at all.

Keyboard Used

ymdk id75 ortholinear.QK_USER_0

Link to product page (if applicable)

https://ymdkey.com/products/idobo-75-keys-ortholinear-layout-qmk-anodized-aluminum-case-plate-hot-swappable-hot-swap-type-c-pcb-mechanical-keyboard-kit?_pos=4&_sid=1578fe37b&_ss=r

Operating System

linux

qmk doctor Output

qmk doctor
Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.2.0
Ψ QMK home: /home/chris/GIT/vial-qmk
Ψ Detected Linux (Arch Linux).
⚠ Missing or outdated udev rules for 'atmel-dfu' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'kiibohd' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'stm32-dfu' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'apm32-dfu' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'gd32v-dfu' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'wb32-dfu' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'at32-dfu' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'bootloadhid' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'usbasploader' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'usbtinyisp' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'md-boot' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'caterina' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
⚠ Missing or outdated udev rules for 'hid-bootloader' boards. Run 'sudo cp /home/chris/GIT/vial-qmk/util/udev/50-qmk.rules /etc/udev/rules.d/'.
Ψ Userspace enabled: False
Ψ Git branch: chris
⚠ Git has unstashed/uncommitted changes.
⚠ The official repository does not seem to be configured as git remote "upstream".
Ψ All dependencies are installed.
Ψ Found arm-none-eabi-gcc version 14.2.0
Ψ Successfully compiled using arm-none-eabi-gcc
Ψ Successfully tested arm-none-eabi-binutils using arm-none-eabi-size
Ψ Found avr-gcc version 15.1.0
Ψ Successfully compiled using avr-gcc
Ψ Successfully tested avr-binutils using avr-size
Ψ Found avrdude version t
Ψ Found dfu-programmer version 1.1.0
Ψ Found dfu-util version 0.11
Ψ Submodules are up to date.
Ψ Submodule status:
Ψ - lib/chibios: 2025-05-15 08:25:11 +0000 --  (8bd61b8)
Ψ - lib/chibios-contrib: 2025-01-08 21:03:31 +0100 --  (3ac181e)
Ψ - lib/googletest: 2021-06-11 06:37:43 -0700 --  (e2239ee)
Ψ - lib/lufa: 2022-08-26 12:09:55 +1000 --  (549b973)
Ψ - lib/vusb: 2022-06-13 09:18:17 +1000 --  (819dbc1)
Ψ - lib/printf: 2022-06-29 23:59:58 +0300 --  (c2e3b4e)
Ψ - lib/pico-sdk: 2025-04-20 21:24:29 +1000 --  (d0c5cac)
Ψ - lib/lvgl: 2022-04-11 04:44:53 -0600 --  (e19410f)
Ψ QMK is ready to go, but minor problems were found

Is AutoHotKey / Karabiner installed

  • AutoHotKey (Windows)
  • Karabiner (macOS)

Other keyboard-related software installed

No response

Additional Context

No response

Contributor guide

Tech stack
c
Domain
backend
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.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C programmingQMK firmwareRGB matrix concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The bug is in the RGB display pattern that moves lights from center outward. The algorithm ignores the center column when the number of columns is odd, causing stuck lights. To fix, locate the relevant animation code in `quantum/rgb matrix/animations/` (likely the `cycle out` or similar effect). Adjust the logic to include the center column in either the left or right group. Ensure proper handling for odd column counts. The code currently assumes even split; add a condition to treat the middle column as part of one side.