Kubuntu 18.04 and HDMI

[Michael Butash]

Sure your cable isn't bad, or just crappy?  Not all cables are created the
same, and the fact you can't *not* buy chinese crap cables at all, they're
always a bit of a crapshoot.  I'd start with a new cable direct and work
back from that.  Not the first time I'd pick up a perfectly good looking
hdmi cable to have it be flaky on me.

Case in point, I designed a 12x large format wall board display array for
two noc mega displays, using contractor-grade hdmi cables back to a few
PC's driving them provided by the install company contracted.  After some
displays working initially, some not, some dying shortly after install
unable to hold resolution above 620x480, we replaced all the cables with
ones of my choosing after some careful research that what they got
originally was crap.  That was more distance + quality related (30-60ft
runs), but when they'd go bad after weeks, and needing to replace the
cables fixed it, again not all cables are created equal.

-mb

On Wed, Aug 29, 2018 at 9:54 AM, Jim <jim.nantz15 at comcast.net> wrote:

> 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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