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xrandr only lists default output

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All of a sudden xrandr only lists default output and when I connect external monitors to my computer nothing happens.

xrandr -q

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 3840 x 2160, current 3840 x 2160, maximum 3840 x 2160
default connected 3840x2160+0+0 0mm x 0mm
   3840x2160     88.00*

Up until yesterday it would list DP-1, DP-2, DP-3, DP-4.

How can I fix this?

Some context:

  • I don't know that I've updated anything
  • The laptop has an nvidia graphics card with version 535 drivers
  • The laptop is in balanced energy mode
I sit in a Tesla and translated this thread with Ai:

mangohost

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