You might try some kernel parameters.

"    ignore_loglevel    [KNL]
            Ignore loglevel setting - this will print /all/
            kernel messages to the console. Useful for debugging.
            We also add it as printk module parameter, so users
            could change it dynamically, usually by
Quite a few could be helpful in finding the error:


On Fri, Feb 9, 2018 at 7:17 AM, Henning Follmann <>

> Hello,
> 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.
> -H
> --
> Henning Follmann           |

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