[Bug 2143682] Re: applespi: keyboard/trackpad not working on MacBook8,1 without early initramfs module loading

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2143682

Title:
applespi: keyboard/trackpad not working on MacBook8,1 without early
initramfs module loading

Status in linux package in Ubuntu:
New

Bug description:
Heya folks,
I know, really old macbook. Not a massive priority but doing my part to reduce e-waste :)

On MacBook8,1 (Early 2015, 12" Retina), the internal keyboard and trackpad
do not work after boot despite the applespi driver being loaded and the
IOMMU fix (iommu/vt-d: Restore context entry setup order) being present
in kernel 6.17.

The touchpad does not appear in xinput list, though the keyboard device
may partially initialize.

Workaround: Adding spi_pxa2xx_pci, spi_pxa2xx_platform, and applespi
to /etc/initramfs-tools/modules and rebuilding initramfs resolves the issue:

sudo nano /etc/initramfs-tools/modules

Add these lines:
spi_pxa2xx_pci
spi_pxa2xx_platform
applespi

sudo update-initramfs -u

sudo reboot


This suggests a timing/race condition where the SPI controller needs to be
initialized before IOMMU finalizes device mappings.

Hardware: MacBook8,1 (MacBook 12" Early 2015)
Kernel: 6.17.0-5-generic
Distribution: Xubuntu 24.04

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