I updated my Toshiba Satellite L500 laptop to Ubuntu 18.04.4, and started having problems with dual displays.

For example I get into my user account, I connect my secondary display, and both displays start flashing black and grey repeatedly. When I disconnect the other display it gets back to the desktop.

  • Please edit your question and add output of lspci -k | grep -EA3 'VGA|3D|Display' terminal command.
    – Pilot6
    Feb 9, 2020 at 5:29


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