Comment 9 for bug 1765556

Update regarding 17.10 - After switching from GDM to lightDM, logout and login are enough, no reboot required. With GDM, logout and sudo systemctl restart display-manager was also enough and didn't require a full reboot.

This is for nvidia-prime 0.8.5, kernel 4.13.0-41-generic and 390.59-0ubuntu0~gpu17.10.1 - but for 0.8.8 on Bionic Beaver (also 390 drivers) a reboot was required even with lightDM instead of GDM, and restarting the display-manager wasn't enough as well..

So I'd say it's a regression in 0.8.8, wouldn't 0.8.5 work with the latest drivers and kernels? It could be a workaround for now to revert back to 0.8.5 for Bionic Beaver.