Kubuntu 18.04 and HDMI

Wed Aug 29 16:42:08 MST 2018

Yep...
I did hit the cable wall too.
Not as bad, but it hurts, it hurts...
ET 

Michael Butash writes: 

> 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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