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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