First at all, take easy I'm a novice in Linux world :D I'm using my laptop (L502x) and one HDMI monitor extended. Built-in display is my primary screen and second monitor is extended. I always use HDMI plugged, but not ever my second monitor is turned on. In this case when I start my laptop Ubuntu show me login screen just only on extended monitor forcing me turn it on and logging... After that I can power off second monitor and using my laptop ordinarily. There are some way to force Ubuntu to show login screen in built-in monitor or who know in both at the same? Ubuntu 19.04 Driver Nvidia-390 VGA 525M
uname -r:
5.0.0-21-generic
lspci:
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Dell GF108M [GeForce GT 540M]
Flags: bus master, fast devsel, latency 0, IRQ 38
Memory at f0000000 (32-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 3000 [size=128]
[virtual] Expansion ROM at f1000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nvidia
Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
Thank you for all!
sddm
(default for Lubuntu) which shows it's greeter on both screens, thus I see it when I have only one screen on. In your case I'd see if you get a better solution that what I did (ie. without adding another package, as I have LXQt installed too I didn't need to add any packages)sudo apt install sddm
will installsddm
and then run the post-install script which will detect you have two and ask you which you want to use. If you change your mind, you cansudo dpkg-reconfigure sddm
(ordpkg-reconfigure gdm3
too actually) and post-install script will re-run asking you again which do you want to use allowing you to change back if that's your wish.