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When I turn on the computer my screen starts to turn on and off after a few minutes for a couple of times to then finally turn off. I then have to force a shutdown to then turn it on in the hope that the screen will stay on this time (usually it will stay on for about 10-20 minutes after the first forced shutdown).

I know it's not my HDMI-cable because before I had the window boot loader alongside the Ubuntu boot loader and there wasn't such an issue when I was on Windows.

I have been researching that issue online to see if others had the same problem. I found some with the same problems and tried all kinds of solutions (like installing xscreensaver and turning off the screensaver).

If there's a solution, please explain it in simple terms, because I'm not that knowledgeable with the intricacies of Ubuntu.

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Well I assume you are using some brand of laptop having backlight issue in ubuntu, probably emachines(old acer) laptops shows off. I recommend you to create file and add contents as follows.

  1. Become Root .
sudo -i
  1. Create a new file
gedit /etc/pm/sleep.d/99_backlight
  1. Enter the following contents in it.

#!/bin/sh

#run 'setpci -s 00:02.0 F4.B=00' when waking up

case "$1" in
        thaw|resume)
           setpci -s 00:02.0 F4.B=00
            ;;
esac
  1. Save the file.
  2. Make it executable
sudo chmod +x /etc/pm/sleep.d/99_backlight
  1. Reboot your system.
sudo reboot
  • @Sagar_Bhooshan It's not a laptop, it's a computer. But I will try that tomorrow anyways. – Rab Aug 23 '16 at 19:53

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