Discussion - Adding a screen to the robot (Making a Mobile Robot Pt 17)

Articulated Robotics Content Discussions
#1

This is the discussion topic for the video and blog post linked above. Please keep all replies relevant to the content, otherwise create a new topic.

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#2

Hello Josh. I am struggling here. I tried to flip the screen using the command you suggested but it fails as follows:

$ DISPLAY=:0 xrandr -o inverted
Invalid MIT-MAGIC-COOKIE-1 keyCan't open display :0

Any ideas?

#3

I was trying to do it from the desktop through ssh before logging in in the GUI of the robot and it seems it would only work after you log in: xorg - X11: Invalid MIT-MAGIC-COOKIE-1 key - Ask Ubuntu so I enabled automatic login for my user, following these instructions: Enable or Disable Automatic Login in Ubuntu 20.04

#4

Ah yes of course, I’m glad you got it figured out!

In case other people have this error, and that doesn’t fix it, here are some other things to try.