Please open a terminal and run 'top' in it to find out if any process is
hogging the CPU when this happens.

Tip: DON'T run gnome-system-monitor because it uses too many resources
itself :)

If no offending process is found then the next thing to check is for 
over-aggressive power management:
  1. Make sure you don't have 'tlp' installed.
  2. Install and run 'powetop' as root to see if your machine is being 
throttled to low frequency.

** Package changed: xorg-server (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1845541

Title:
  OS becomes unresponsive when power is plugged in and battery is low

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