I recently (about 3 weeks ago) got a new laptop (Gigabyte P15 [i7 6700HQ, GTX 950M, 8GB GDDR3L, HM170 chipset]) and installed linux mint 17.3 64-bit cinnamon on it alongside windows 10 (pre-installed). The only problems I have had was that I needed to a lot of digging to find the right driver for my wireless to work properly (this is fixed and working now) and I cannot actually shutdown from linux. When I do tell it to shutdown (including restart button and 'shutdown -P now' from terminal) it removes everything but the desktop background image and stays there until I do a hard shutdown. I have tried editing /etc/default/grub adding both acpi=force and apm=power_off to the GRUB_CMDLINE_LINUX_DEFAULT line (including each one individually and both inside and outside the quotes, some sites say inside and some say outside), but nothing has worked. I have also double checked that cpu scaling is turned on my BIOS. Only one time has my computer fully shutdown from linux, but without changing anything it did not shutdown properly the next time. Beyond installing the driver for my wireless and the things to try and get the shutdown function to work I have not changed anything else (beyond the superficial things like desktop background and install a new media player etc.) in linux. My computer also does not wake up from suspend, it just sets there with a black screen. I am not as worried about getting the suspend function working and am only mentioning in case it gives any insight to the issue of shutdown not working.

Any ideas? I have been unable to find any other options through searching online.

Did you download or have you bought the OS?

I downloaded mint and installed it from a USB drive using a different mint machine to download and load onto the USB drive.

I would deactivate any suspension, hibernating or any type of this (nonsense?) everywhere.

Maybe something is interfering.

You could look at the logs in /var/log/. Maybe the point where it's hanging can be identified.

The gpu manager log listed that I was not using a graphics driver. Although I had checked in the driver manager, it said I was using the nouveau driver instead of the nvidia one, but everything graphics related (at least as far as I could tell) seemed to be working fine so I didn't change it. But when the log said I had no driver I went ahead and switched to the nvidia one and now shutdown and suspend both work, but restart hangs on the black screen with the mint logo. However I generally only shutdown rather than restart so I can probably live with that for the moment. I haven't tried hibernate, but I'm not really worried about that either.

Probably issues because the hardware is brand new. Either updates or manual tweaking could be still neccesary.

I know this is marked as solved but it doesnt seem to be.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

change to

GRUB_CMDLINE_LINUX_DEFAULT="acpi=off"