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Linux: USB to HDMI stopped working


Setup: Laptop with two external monitors.  One monitor connected by the HDMI port on the laptop.  The other monitor connected by usb using a Sabrent usb to HDMI adapter.  OS: Ubuntu 16.04.
After doing a Ubuntu dist-upgrade  and rebooting my video cards started acting goofy.  When my Sabrent usb to hdmi card is plugged into my laptop only it gets the picture assigned to it.  If I unplug it and reboot the laptop screen and HDMI monitor both get the picture.  I was suspicious that Nvidia drivers has been installed.  This was the case.  Here was my fix:

  1. sudo apt-get purge nvidia-*
  2. sudo apt-get remove –purge xserver-xorg
  3. sudo apt-get install xserver-xorg
  4. sudo dpkg-reconfigure xserver-xorg

 

I shut down my system, plugged in the HDMI and the USB monitors and rebooted.  All three monitors worked.

By: Nighthawk