Have you tried adding pti=off to the kernel boot line?  This is supposed
to turn off the spectre/meltdown "fix".

Henning Follmann <hfollm...@itcfollmann.com> writes:

>I have a strange issue with the newest kernel
>4.9.0-5-amd64 on this 2011 Macbook Pro.
>As far as I can see it has to do with the power management of this laptop.
>Whenever the laptop is on power supply the boot process stops hard after
>I enter the passphrase for the encrypted lvm. There is one last message
>that it tries to mount root but it stops hard there. There is also no log
>(of course not because there is no device to write to yet).
>when I unplug the laptop during boot it boots fine.
>Previous kernel do not show this behavior.

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