lirc mysteriously stopped working when I upgraded to kernel 4.19.66-v7+ on my Raspberry Pi a while back. After an initial battle that lead to no success, I let it collect dust until this fateful night when she returned to her full functionality.

tl;dr

The kernel module lirc_rpi has been replaced …

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lsusb shows us that—sure enough—Apple's IR receiver is being loaded on boot:

# lsusb
Bus 005 Device 002: ID 05ac:8242 Apple, Inc. Built-in IR Receiver

lsmod reveals hid_appleir is the module being loading for our remote. Let's blacklist it:

# echo 'blacklist hid_appleir' > /etc/modprobe.d/hid_appleir.conf
# depmod -ae
# update-initramfs …

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