If you are still up for testing things, please test the kernel that comes from this repository:
deb [trusted=yes arch=arm64] https://source.mnt.re/reform/reform-debian-packages/-/jobs/7194/artifacts/raw/repo reform main
This should get you kernel version: 6.12.6-1+reform20241222T021703Z
This is the result of reverting upstream commit d97e71e449373efbd2403f1d7a32d416599f32ac.
If users of other platforms can also give it a try, then that would be cool too. It would help avoiding further regressions. If it makes your life easier, I prepared some system images with that kernel here:
EDIT: now successfully tested on imx8mq thanks to @2disbetter