[BUG] Bug report: Apple T2 keyboard/touchpad/touch bar broken after kernel update on linux-cachyos 7.1.2-2, works fine on linux-cachyos-lts 6.18.37-1

[ssm-sd]

Pre-flight checklist

• I have searched existing issues and this is not a duplicate.
• I have read the Contributing Guidelines.
• I have verified the issue is reproducible with the latest available CachyOS kernel.
• I have tried to reproduce the issue on Arch Linux's linux kernel.

Upstream / vanilla kernel check

I tested with a vanilla/upstream kernel and the issue ALSO reproduces there (upstream bug — please report upstream)

Kernel variant

linux-cachyos-lts

System information (cachyos-bugreport.sh)

https://paste.cachyos.org/p/aa3c80a.log

Manual system information (if cachyos-bugreport.sh is unavailable)

**Hardware:** MacBook Pro 13" 2020 (MacBookPro16,2, Intel i5-1038NG7, T2 chip)

OS: CachyOS x86_64
Host: MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports) (1.0)
Kernel: Linux 6.18.37-1-cachyos-lts
Uptime: 5 mins
Packages: 6 (flatpak), 1594 (pacman)
Shell: bash 5.3.15
Display (eDP-1): 2560x1600 @ 1.25x in 13", 60 Hz [Built-in]
DE: KDE Plasma 6.7.2
WM: KWin (X11)
Terminal: konsole 26.04.2
CPU: Intel(R) Core(TM) i5-1038NG7 (8) @ 3.80 GHz
GPU: Intel Iris Plus Graphics G7 @ 1.05 GHz [Integrated]
Memory: 3.14 GiB / 15.42 GiB (20%)
Swap: 5.75 MiB / 15.42 GiB (0%)
Disk (/): 24.08 GiB / 97.87 GiB (25%) - ext4
Disk (/home): 750.97 GiB / 807.28 GiB (93%) - ext4
Battery (bq20z451): 87% [AC Connected]
Locale: en_US.UTF-8

Bug description

After updating linux-cachyos to version 7.1.2-2 (build date 2026-06-29), the built-in
keyboard, trackpad, and Touch Bar stopped working immediately after reboot.
No drivers were manually installed — everything worked out of the box since
initial CachyOS install (2025-06-10).

Booting into linux-cachyos-lts (6.18.37-1) restores full functionality of
keyboard, trackpad, and Touch Bar without any changes.

Workaround:
Booting linux-cachyos-lts resolves the issue completely.

Happy to provide any additional debug info needed.

Steps to reproduce

1. Boot into linux-cachyos 7.1.2-2 on a T2 MacBook Pro 13" 2020
2. Observe that internal keyboard, trackpad, and Touch Bar are not detected

Expected behavior

Internal keyboard, trackpad, and Touch Bar should be detected and functional,
as they were prior to this kernel update.

Actual behavior

None of the T2 internal input devices (keyboard, trackpad, Touch Bar) are
detected. Only externally connected USB peripherals work.

Logs / stack traces

cachyos-bugreport.log
dmesg-lts-working.log
journalctl-list-boots.txt
lshw-output.txt
kernel-config-apple.txt
pkg-info.txt
apple-related.log
kernel-broken-boot.log

- `kernel-broken-boot.log` — full dmesg/journalctl -k from the broken boot
- `apple-related.log` — filtered apple/spi/hid related log lines
- `pkg-info.txt` — linux-cachyos package info
- `dmesg-lts-working.log` — dmesg from working LTS boot for comparison
- `lshw-output.txt` — full hardware listing
- `cachyos-bugreport.log` — cachyos-bugreport log

Additional system information

• OS: CachyOS (rolling)
• Broken kernel: linux-cachyos 7.1.2-2-cachyos
• Working kernel: linux-cachyos-lts (6.18.37-1)
• Bootloader: systemd-boot

[jbouze]

Looks like the apple-bce module is missing in 7.1.2-2 https://discuss.cachyos.org/t/missing-apple-bce-module-on-linux-cachyos-7-1-2-2/32310

[jbouze]

Solved as of 7.1.3-1. Thanks!

[ssm-sd]

yeah! keyboard, trackpad, and touch bar work with kernel 7.1.3-1-cachyos. Thanks a lot!