On Sun, Jan 24, 2021 at 8:13 PM Ralph Ronnquist via Dng
<dng@???> wrote:
>
> On 24/01 19:59, o1bigtenor via Dng wrote:
> > 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)
>
> I think that
>
> 1) the program "cvt" is useful for getting the details right
> ----
> $ cvt 3840 2160 30
> # 3840x2160 29.98 Hz (CVT) hsync: 65.96 kHz; pclk: 338.75 MHz
> Modeline "3840x2160_30.00" 338.75 3840 4080 4488 5136 2160 2163 2168 2200 -hsync +vsync
> ----

tried this - - - - sorry it needs to be a little bit different!
>
> 2) you can use that almost verbatim to assign this with xrandr, rather
> than rebuilding the module:
>
> $ xrandr --newmode "3840x2160_30.00" 338.75 3840 4080 4488 5136 2160 2163 2168 2200 -hsync +vsync
>
If you look in the attached files the frequency can't be 338.75 - - - it
to be 297 MHz. The mode file is just a little bit different than the one
that cvt proposes. (Sunno why and there are some other goofy things
going on but if I can get it working - - - - I can live with the rest!)

Thanks for the ideas !