I had a similar problem.
Several similar problems to be correct.
I also have a NVIDIA card (ASUS laptop).
The first time around was the TV/laptop combination.
It just didn't want to work.
So I got another TV.
Which didn't work either...
Until I replaced the HDMI cable for a better quality.
I could not make it wort with Mint (can't remember the version) so I went
with Ubuntu.
Until I upgraded Ubuntu...
Then Linux Mint worked flawlessly.
Until I upgraded it to 18.2
After a bloody battle I made it work.
For the most part...
Until I upgraded to 18.3...
Now we are in a stalemate, where it works most of the time as expected.
Until I *TOUCH* the connector to the laptop.
Then the song and dance begins again...
I haven't had to go so far as to replace the drivers (this time) but I can
relate very well to your horror story.
At this stage I don't know if have a weak connector, a flimsy cable, a
cantankerous TV or I am just down in my psychotic medication and I am
imaging the whole thing, but I have fences, and I don't breath, around that
%$#@ connector.
I hope this helps, but if it doesn't, I can forward you the contact
information of my therapist.
He doesn't know anything about HDMI, but prescribes very yummy gummies...
:)
ET
Jim writes:
> 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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