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I am using xubuntu 16.04 with intel and nvidia GPUs. When using intel there are no problems, when doing prime-select nvidia and logging out lightdm will not start with the error message (see below). The screen is black with _ sign stays on it. I can switch to text console, but no X.

If I will use XDM as a login manager there will be no issue and a session using nvidia drivers.

If I do prime select intel every thing goes back to normal.

How to fix?

** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/30_xubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf

** (process:3499): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'

(lightdm-gtk-greeter:3171): Gdk-WARNING **: lightdm-gtk-greeter: Fatal IO error 0 (Success) on X server :0.
NonStandardModel
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Kaim
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1 Answers1

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assuming you have done a "fresh install" of xubuntu 16.04 and not knowing the model of the machine and neither the video card i would do: 

sudo apt-get remove --purge nvidia* && sudo apt-get install nvidia-settings.

Then running nvidia-settings i would figure out what my needs are and make the settings permanent.

Malkavian
  • 109