My guess would be that your HDMI switch isn't reliably passing along 
everything that it should be.  You may want to try a different HDMI switch.

Brian Cluff

On 08/29/2018 08:58 AM, Jim wrote:
> I have a box running kubuntu 18.04 64 bit and an NVIDIA Geforcee GT520 
> video card.  The first monitor is connected via the DVI connector.  
> The second monitor using the HDMI connector. I also use the  second 
> monitor for the cable box and I have an hdmi switch to connect the 
> second monitor to the computer or the cable box.
>
> The problem is that the computer doesn't recognize there's an hdmi 
> monitor connected.  Sometimes it does this when I boot up the 
> machine.  Sometimes when I have the second monitor connected to the 
> cable box and switch back to the computer, I don't get the second 
> display.  If I'm lucky, restarting the x server will work. Sometimes I 
> have to reboot the machine.  If it really wants to be a pain in the 
> ass, I have to uninstall the NVIDIA drivers, and restart the x 
> server.  Then the Nouveau drivers are used and it works.  That is, 
> until the next time it happens and reinstalling the NVIDIA drivers 
> fixes the problem.  Until next time.
>
> When it's not working xrandr says HDMI-1 is disconnected, even though 
> it is connected.   Is there something I can do to  restore the second 
> display without the rigamarole of uninstalling/installing drivers?  I 
> tried using the second monitor's VGA input.  That works, but I then 
> have to use the sound card in the computer.  Because of the cable box, 
> there's an annoying hum in the audio.  I can deal with that by 
> connecting a wire from the case of the computer to an alligator clip 
> which I connect to the coax input to the cable box.  Then the clip 
> comes off or I bump something and that annoying hum is back.
>
>
> Any ideas?  Thanks
>
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