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I have recently installed Debian 8 (Jessie) on my laptop. I am using an external monitor as the primary display and the laptop monitor as a secondary display.

The laptop monitor shows text etc on startup and then goes blank when the login screen loads.

After logging in I can make the laptop monitor work by changing the resolution. After this the laptop monitor works until I log out again. It seems like it doesn't matter what resolution I change it to, just the act of changing the resolution makes it work.

I am using Gnome.

Can someone tell me how I can configure the system so that I do not have to do the aforementioned workaround?

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You could use xrandr to configure the screens directly after login by placing a script with the correct parameters into the autostart folder of your window manager or by putting the xrandr command directly into ~/.xsession, e.g. (with LVDS and VGA being the names of your respective screens):

xrandr --output LVDS --size 1024x768 --output VGA --size 1024x768 --right-of LVDS

The xrandr-manpage shows some good examples of how to formulate a specific layout for one or two monitors.

You can use xrandr --query to list the current configuration of your screens and then use that output to set the attributes for your xrandr command.

If you put the xrandr command into ~/.xsession, it should run in the background (just add & at the end of the line).

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