Sun, 24 Jan 2021 19:59:19 -0600 - o1bigtenor <o1bigtenor@???>:

> Greetings
>
> (Asking this here as so far I've seen some seriously skilled folks
> connecting in!)
>
> I've been working on getting a HiSense 50" TV (3840x2160_30) working
> on a Nvidia GTX1050 Ti graphics card. I have a second graphics card
> (Nvidia GT (IIRC) 570) with a present stable of 4 -1920x1080 monitors.
> I am running Nouveau rather than proprietary Nvidia software and get
> to use xrandr to set up my graphics system after every boot but
> although it took me a while to learn how to do this setup its pretty
> quick now.
>
> Part of the 'fun' in wanting to add the 3840x2160_30 monitor is that
> EDID has become a more than somewhat 'challenging' system. Enough so
> that I was able to find this:
> https://www.kernel.org/doc/html/v5.6/driver-api/edid.html
>
> Creating this 'custom' EDID is a long ways from my wheelhouse - - - I
> have spend some time today trying to find some of the stuff indicated
> on that page - - - - can't find anything (maybe also a good thing!). I
> am going to attach (hopefully the list accepts attachments) 2 files
> which give enough information so that someone with the requisite
> skills could create this 'custom' EDID that I need so that I could
> then use xrandr to get this monitor working. Is there someone who
> might be able to do this? (I think doing it might be a lot less time
> consuming that guiding me through the doing of it - - - especially as
> I have essentially zero programming skills)
>
> Please?
>
> TIA



Hi

I had the same problem with a Panasonic Viera TV. Here below the way I
have solved.


You need a valid right modeline for your tv/monitor with the desired
resolution/refresh.

You have the hardware specs of your tv/monitor, and its EDID file you
attached which has:

  DTD   1:  3840x2160   30.000 Hz  16:9    67.500 kHz 297.000 MHz (1872 mm
  x 1053 mm) Hfront  176 Hsync  88 Hback 296 Hpol P
                 Vfront    8 Vsync  10 Vback  72 Vpol P

Using these informations you should be able to find the modeline you need.

See:

Modeline Database - MythTV Official Wiki
https://www.mythtv.org/wiki/Modeline_Database

Working with Modelines - MythTV Official Wiki
https://www.mythtv.org/wiki/Working_with_Modelines

* Modeline Calculator
https://arachnoid.com/modelines/

videogen
http://www.dynaweb.hu/opensource/videogen/

Debian -- Package Search Results -- videogen
https://packages.debian.org/cgi-bin/search_packages.pl?keywords=videogen&searchon=names&subword=1&version=all&release=all


Your modeline will be something similar to:

"3840x2160_30.00" 339.57 3840 4080 4496 5152 2160 2161 2164 2197 -HSync
+Vsync

(Be very careful because using an incorrect modeline may DAMAGE the
display.)


Once you have the right modeline, you need to pass it to xrandr for each
session.

If you are using a DM (e.g lightdm), you can configure it to run a script
when starting each session.

Here is how mine is (you should change it accordingly to your tv/monitor
model and modeline): ~~~
#!/bin/bash

# ## DISPLAY SETUP
# Modeline for Panasonic Viera 32" HDMI LCD TV (model: TX-32LX52F)
xrandr --newmode "1216x684_60" 74.160 1216 1356 1396 1648 684 707 712 750
+hsync +vsync xrandr --addmode HDMI-1 "1216x684_60"
xrandr --output HDMI-1 --mode "1216x684_60"
~~~

Regards

al3xu5

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