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I am running Debian 9 with LXDE on a LattePanda and the main monitor is defaulting to the Internal Display that does not exist. I want to disable the internal display so each time it boots up to the HDMI monitor.

I am familiar with using xrandr like in this solution, but the terminal always opens on the non-existent internal display. So I can't execute it

I tried updating the BIOS option to force the laptop lid to be closed, but that doesn't fix it.

Does anyone know of another way to disable the internal monitor by default? I have to flash several LattePandas which could all have a similar issue.

xrandr output

DP-1 disconnected primary (normal left inverted right x axis y axis) HDMI-1 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) HDMI-2 connected 1600x900+0+0 (normal left inverted right x axis y axis) 442mm x 249mm 1600x900 60.00*+ 1280x800 59.91 1152x864 75.00 1280x720 60.00 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 640x480 75.00 72.81 66.67 59.94 720x400 70.08 DSI-1 connected 1024x600+1600+0 (normal left inverted right x axis y axis) 0mm x 0mm 1024x600 60.00*+ 960x600 60.00 960x540 59.99 800x600 60.00 60.32 56.25 840x525 60.01 59.88 800x512 60.17 700x525 59.98 640x512 60.02 720x450 59.89 640x480 60.00 59.94 680x384 59.80 59.96 576x432 60.06 512x384 60.00 400x300 60.32 56.34 320x240 60.05

lspci output

00:00.0 Host bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register (rev 36) 00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Configuration Registers (rev 36) 00:03.0 Multimedia controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Imaging Unit (rev 36) 00:0b.0 Signal processing controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Power Management Controller (rev 36) 00:14.0 USB controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller (rev 36) 00:1a.0 Encryption controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine (rev 36) 00:1f.0 ISA bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU (rev 36)
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  • Could you provide more information about the internal display device? Output from lspci, and xrandr, etc. Commented Jun 24, 2019 at 13:01
  • @LucasRamage sure, just added it to my question Commented Jun 24, 2019 at 13:08

2 Answers 2

Reset to default
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Found a solution that lets me disable the internal monitor.

  1. Boot into Recovery Mode and login as root

This is important, it allows me to access the command line from the HDMI monitor which I couldn't do normally

  1. Edit /etc/default/grub

Change

GRUB_CMDLINE_LINUX_DEFAULT="quiet"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=DSI-1:d"
  1. Run update-grub

Now the system boots up without the internal monitor. Credit to a comment made by @Dmitry

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There are a few methods one could employ,

1) Completely disable graphics on boot, such as in this answer.

2) Blacklist the kernel module for the video device.

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  • 1
    Thanks for the help, the main issue was that I couldn't access the terminal since it would always open on the non-existent internal monitor. I ended up finding out that booting into recovery mode allowed me to use the HDMI monitor Commented Jun 24, 2019 at 13:32

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