It is about Ubuntu 16.04 but should also work for Ubuntu 20.04 (which Zorin is based on). Curiously, Legacy BIOS setting is recommended.
Re: HP Zbook 15 G3 - ubuntu 16.04 - very annoying acpi issue
https://ubuntuforums.org/showthread.php?t=2328988&page=2
Hi there,
I have testet a lot and and can confirm that Ubuntu 16.10 works out of the box.
In Ubuntu 16.04 it works for me if I
1) Change so I use NVIDIA binary (I use version 367.57) instead of Nouveau driver (which gives a GPU lockup or something)
2) Set pnpacpi=off in the boot (and remove the quiet splash etc stuff)
This can be done from GRUB pressing 'e' and replace "ro quiet splash" etc with just "ro pnpacpi=off" and booting pressing F10
To do it permanently edit /etc/default/grub to have
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="pnpacpi=off"
and do 'sudo update-grub'
To get into the system and make the changes I had to boot into rescue ("rescue" as parameter in GRUB).
BTW - in the process of experimenting I also had to temporarily disable graphical startup. I did this with
sudo systemctl set-default multi-user.target
and then I only had a prompt where I could do this to start graphics manually:
sudo /etc/init.d/lightdm start
To revert to graphical startup do:
sudo systemctl set-default graphical.target
This is all with these BIOS settings:
1- change the UEFI boot option to legacy boot option
2- change the Hybrid Graphics option to Discrete Graphics option
Last edited by jacob-nordfalk; November 16th, 2016 at 09:20 AM.

