prime-select doesn't switch to nvidia after reboot

[QkiZ]

After sudo prime-select nvidia, recreate new initramfs and reboot I still land on Gnome using Intel gfx card. I have color LED which provides me information about which card is used. When I check which mode is selected with sudo prime-select query I see nvidia but when I check which card is really used with glxheads I see Intel.
For the true switch I need log off from Gnome, switch to virtual console and type two commands:
sudo modprobe nvidia
sudo systemctl restart display-manager.service
After these two commands, I'm able to use Nvidia gfx card under Gnome.
In my personal opinion, this solution with switching between cards through initramfs and reboot is a huge step back in the usability of Ubuntu. The previous solution with alternatives was much much better for end user.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nvidia-prime 0.8.8
ProcVersionSignature: Ubuntu 4.15.0-20.21-lowlatency 4.15.17
Uname: Linux 4.15.0-20-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Sun Apr 29 13:09:45 2018
Dependencies:

InstallationDate: Installed on 2015-02-13 (1170 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
SourcePackage: nvidia-prime
UpgradeStatus: Upgraded to bionic on 2018-04-28 (1 days ago)

[fargoth (cantfind)]

Using prime indicator plus for switching, and lightDM instead of GDM behaves as it should.

With GDM it require sudo systemctl restart display-manager - guess it's a GDM bug.