Kubuntu 18.04 and HDMI

[Jim]

It just happened again, this time while the monitor was connected to the 
computer.  I connected the HDMI cable directly to the monitor, the 
picture did not come back.  I restarted the x server and it's working 
for the moment.

On 8/29/18 9:44 AM, kitepilot at kitepilot.com wrote:
> 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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