[mythtv-users] Complication(s) with display upgrade - need help

Craig Huff huffcslists at gmail.com
Sun Mar 18 21:58:23 UTC 2018

On Sun, Mar 18, 2018 at 4:21 PM, Mark Perkins <perkins1724 at hotmail.com>

> On 19 March 2018 7:10:10 am Craig Huff <huffcslists at gmail.com> wrote:
>> I have an FE running Ubuntu 14.04 and MythBuntu that was connected to a
>> CRT TV using composite video from the built-in Nvidia 1650 display
>> controller, but the CRT finally died. (Yay?)
>> I replaced the TV with a new, modern LED 4K HDR display (yeah, one
>> extreme to another), but I'm having problems.
>>    - First: The FE is now connected via a DVI to HDMI adapter to HDMI on
>>    the new TV.
>>       - The BIOS splash screen and the Ubuntu 14.04 boot screens display
>>       successfully on boot up.
> Try adding nomodeset to the boot options. A quick google suggested
> something like this:
> quiet splash acpi=off nolapic nomodeset
> That should allow further debugging / investigation.
>>    -
>>       - Then I get a blinking cursor in the top left corner of the
>>       display,
>>       - Eventually the TV puts up a display about the signal resolution
>>       is incompatible and I need to change it before the TV will display the FE's
>>       output.
>>       - If I swap the TV for an LED Computer monitor (27" Acer) with the
>>       input still via HDMI, I get a successful display of the MythTV main menu
>>       page at the end of the boot up process with a resolution of maybe 1920 x
>>       1080.
>>       - I opened the Nvidia settings application and tried saving that
>>       configuration (I think it got written to /etc/X11/xorg.conf) and re-trying
>>       to display on the TV, but no joy.
>>       - Any advice on how to get this working would be greatly
>>       appreciated.
>>    - Second: Since I'm already here, hat in hand, I might as well
>>    anticipate the next problem.
>>       - If I understood the data about the DVI to HDMI adapter cable
>>       correctly, it won't supply audio to the TV, but there's no separate Audio
>>       In connection to the TV, only Audio Out.
>>       - Is there a way to get the audio fed into the HDMI cable like
>>       "normal" devices do -- maybe an audio / video Y-adapter for HDMI?
>>       - Less likely alternative audio input paths include:
>>          - A TOS link from the PC to the TV, but the one on the TV is
>>          labeled "Out", not "In", and even if that would work, the question becomes
>>          how to associate that audio with the correct video input?
>>          - USB ports, but with a PC and a TV, who'd be the "master" and
>>          who the "client"?
>>          - Maybe I started with the wrong approach?  This
>>          <https://www.amazon.com/dp/B01FXDW2ZY/ref=sspa_dk_detail_2?psc=1>
>>          looks like it would be a solution, but I'm wondering if it will work
>>          properly for use with MythTV video -- especially on my current Ubuntu 14.04
>>          / MythTV v0.27.6?
>> What model is the TV? It would be unlikely / unlucky to not have separate
> audio in?
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I got in to the grub dialog at boot and modified the command to include the
nomodeset option, but no joy.  As a reminder, I can see the BIOS splash
screen and the Ubuntu boot screen (the one with the progress dots blinking
underneath the text "Ubuntu 14.04"), but once X starts, the screen goes
blank until the TV reports the resolution incompatibility.

While I'm waiting for more suggestions, I will probably drag the computer
monitor to the FE and try to see what happens if I connect it via VGA in
tandem with the TV.  If dual monitor mode works and I can see things on at
least the computer monitor, maybe I can access the Nvidia settings
application on the computer monitor and change the settings for the TV to
something it likes?

There is no analog audio input.  The TV is a Samsung UN65MU8000FXZA. It has
one Digital Optical Audio input and 3 USB 2.0 ports.

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