Hey! This happens to me too.

But I can detect that I can't turn off Solus, if my netbook is connected to AC.
If netbook is running with batery, it turn off correctly.

Any idea whit this?

I have the same issue with a Lenovo T470 when rebooting or shutting it down. I have FDE enabled in case this might have an effect here. It hangs with the following screen:

I am thinking of upgrading my T-460 to a T-470, so this issue is kind of important.

Same laptop (ASUS GL552V), same issue. When trying to reboot, from the live session or installed on disk, the system freezes. Being on battery or disconnected from wifi (as I saw in one Fedora thread) does not remedy the problem.
The workaround for me was to install the nVidia drivers, so this may be tied to the Intel drivers somehow (or nouveau).

I managed to fix this for my laptop. Apparently the fault lies with the nouveau driver, so it needs to be blacklisted.
Simply uninstalling xorg-driver-video-nouveau did not work.
Shutdown, restart and sleep are all fine now.

sudo mkdir /etc/modprobe.d
echo "blacklist nouveau" | sudo tee -a blacklist.conf

Another way is using nouveau.modeset=0 as kernel param.
Basically echo 'nouveau.modeset=0' | sudo tee /etc/kernel/cmdline instead of the blacklisting.
Mode setting is also useful on first boot so you can shut down properly.
Some details on the forum: https://solus-project.com/forums/viewtopic.php?f=14&t=11207&p=36160#p36160

It would be useful if system config was somehow detected on boot and, depending on availability of drivers and what the system is capable of, enable/disable stuff so things work out of the box.

Compiled from:
https://askubuntu.com/questions/835364/ubuntu-16-04-1-nvidia-working-but-intel-shows-black-screen
https://solus-project.com/forums/viewtopic.php?f=9&t=45

In T4414#96237, @theSoenke wrote:

I have the same issue with a Lenovo T470 when rebooting or shutting it down. I have FDE enabled in case this might have an effect here. It hangs with the following screen:

I had the exact same problem on the same Lenovo T470 laptop with encrypted disk.

@ovichiro's comment (https://dev.solus-project.com/T4414#101735) helped with resolving the problem. Basically I blacklisted the nouveau module and now my machine can reboot! Thank you for the tip.

I finally had some time to check this (not using my laptop that often) and the suggestion to blacklist the nouveau driver as per @ovichiro solved this.

However the instructions posted are not always working and should be:

sudo mkdir /etc/modprobe.d
echo "blacklist nouveau" | sudo tee -a /etc/modprobe.d/blacklist.conf

(in the original version you are not going to write the `blacklist.conf into /etc/modprobe.d` with the second command, if you were not already located in the directory you're creating with the first command).

Adding /etc/modprobe.d/blacklist.conf with the content "blacklist nouveau" resulted in Solus 4 not booting anymore on my Macbook mid-2010. I'm putting this here in case someone else considers trying this on a macbook: have a plan B.