You probably don't have the nvidia drivers installed in your kernel image, which can happen even if think you have the nvidia modules installed, because the standard 18.04 optimus logic uninstalls the drivers when you choose intel mode. Display manager doesn't start in nvidia mode? Sudo apt purge nvidia-prime sudo apt install nvidia-primeĪnd to revert to gdm3, install and select it as the default:īut you will have to work out why the rvice did not do its job.

Purge and reinstall the package nvidia-prime You could rename /usr/local/bin/prime-select to /usr/local/bin/prime-select-fast so that the standard script is no longer masked by the modified one. This code doesn't really disturb your system much. The first time you use sudo prime-select nvidia to change, you may get an error about a missing fileĭo: sudo touch /usr/share/X11//nfĪnd repeat sudo prime-select nvidia Prime sync for tear free laptop panel This will be true if you have installed the standard Ubuntu nvidia-drivers but it will not be true if you did the standard prime-select intel. You must have the nvidia drivers installed in your initramfs. Ubuntu 18.04 (might work with other distros of similar age which are based on the vendor-neutral library approach, if you change some paths)ībswitch (via sudo apt install bbswitch-dkms) Make sure you have the nvidia drivers running before proceeding.

They are installed by the standard Ubuntu module, but if you did the standard 18.04 prime-select intel, they are no longer installed in the kernel. This code assumes the nvidia drivers are installed. If you are reading this after installing the fast prime-select (this module), then you access the standard prime-select via /usr/bin/prime-select To ensure that nvidia drivers are installed in your initramfs. If you have done this already, make sure you do properly install the nvidia drivers the standard ubuntu way, from Additional Drivers.Install from apt: sudo apt install rustc cargo To install it, you need to know about git clone and you need to be able to change your display manager to lightdm. If things go wrong, you need to know about virtual consoles and recovery mode and some basic systemd admin. However, it also takes advantage of recent improvements, so you can swap modes without rebooting. Why does this exist? It restores the pre-18.04 'bbswitch' approach it's much faster to change profiles and more reliable.

Install nvidia driver ubuntu lightdm