Question

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Ubuntu Detects 2 monitors when I only have one

rated 0 times [ 13] [ 0] / answers: 1 / hits: 15858 / 3 Years ago, thu, june 10, 2021, 2:41:27

Ubuntu Detects 2 monitors when I only have 1. This causes an issue when booting up because it's detecting 2 monitors and by default it is mirroring the display; which is causing a distorted picture since it's trying to create a mirror image on 1 display. xrandr output.... The VGA1 is the phantom monitor and I need to remove it so it boots to LVDS1 and NOT mirrored.

Any suggestions on how to permanently remove VGA1?

:~$ xrandr -q

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192

VGA1 connected (normal left inverted right x axis y axis)

1024x768 60.0

800x600 60.3 56.2

848x480 60.0

640x480 59.9

LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm

1920x1080 59.6*+

1680x1050 60.0 59.9

1600x1024 60.2

1400x1050 60.0

1280x1024 60.0

1440x900 59.9

1280x960 60.0

1360x768 59.8 60.0

1152x864 60.0

1024x768 60.0

800x600 60.3 56.2

640x480 59.9

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taigysel

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3 Years ago

answered 3 Years ago afisird · Accepted Answer

This seems to be an issue with certain motherboards that have an HDMI and a Display Port. I figured out that either my Gateway ZX6800 Touch-Screen is using a certain Laptop motherboard with the on-board Intel HD chipset that supports this or it is seeing the IR Blaster or TV Tuner and driving it as a monitor.

Either way the fix is:
Edit /etc/default/grub
add "video=VGA-1:d" between the quotes in the GRUB_CMDLINE_LINUX line
update-grub

Look in /sys/class/drm for a list of your computers outputs.Mine was labelled as "card0-VGA-1". Just remove the "card0-" and that's the name of the output in question.