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I'm booting Sparkylinux from a live-usb in a notebook with broken screen.

There is a external monitor connected by VGA. The external monitor is booted dual with the notebook monitor And the external monitor resolution is booted with some issues.

To fix it i need to put the external monitor as the primary monitor, or even better, shutdown the notebook monitor. In Ubuntu i can use Fn key to change monitors.

In Lubuntu, even i cant see much, i can open the start menu, type monitor and change it manually.

In Sparkylinux the special key dosen't work and start menu is tricky, so i cant access the monitor menu whithout seeing.

So I'm trying xrandr to change it , but apearently i cant open the terminal ( ctrl+alt+t), the bad resolution sends it to another realm.

So i used ctrl+alt+F1 to try xrandr, but for most but not all xrandr commands i get

"xrandr: Cant open display".

Like xrandr --listmonitors

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xrand is an Xwindows utility and expects to be run inside an X session, that's where the Cant open display comes from.

You could do this (if your DISPLAY is :0):

$ export DISPLAY=:0
$ xrandr --listmonitors
$ xrandr your_command
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  • For Bash, DISPLAY:0 was not a valid identifier, but export DISPLAY=:0 worked. See askubuntu.com/a/156037.
    – Kyle
    Dec 26 '21 at 19:13
  • @Kyle, that was a typo, thanks for pointing it out. Fixed. Dec 27 '21 at 0:40

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