Ubuntu detect wrong monitor

Question

I'm in trouble with my PC. I have only one monitor, but Ubuntu detects two.

The monitor that was real on my system is Dell Inc. 24". When I start my computer, I can't see the login screen (because it is displayed on "Built-in display"), and I have to do like this: Enter -> Type password -> Enter to login my account. If I use more than one account then I can't see those on login screen.

I'm using Ubuntu 17.04, Intel i5 7500, Intel 630HD, 8GB-RAM. Windows does not have same problem.

Answer 1

Seems to be a bug in with the Intel HD driver. The false monitor needs to be disregarded on boot.

Use xrandr to find the false display.

xrandr -q

Then match that to the drm display options

ls /sys/class/drm

My non existent extra screen was DSI1 in xrandr but card0-DSI-1 in /sys/class/drm)

Edit the grub configuration file to disable the screen before booting the os.

sudo gedit /etc/default/grub

Change:

GRUB_CMDLINE_LINUX=""

To

GRUB_CMDLINE_LINUX="video=DSI-1:d"

Replace DSI-1 with whatever the display was named in /e /sys/class/drm minus card0

then run

sudo update-grub

and reboot.