Re: Display resolution 3840x2160@24rb stopped working after Upgrade from Stretch to Buster
On Thu 12 Sep 2019 at 06:23:04 (+0000), Jan Michael Greiner wrote:
> On Monday, September 9, 2019, 1:55:06 PM GMT+2, Charles Curley wrote:
> >> On Mon, 9 Sep 2019 10:20:37+0000 (UTC) Jan Michael Greiner wrote:
> >> With Debian Stretch (9.8) I had the display running with 3840x2160
> >> resolution at 24Hz reduced blank.
>
> >> [What worked with Debian Stretch (9.9)]
> >> export modename="3840x2160_24.00_rb"
> >> xrandr --newmode $modename 209.75 3840 3888 3920 4000 2160 2163 2168 2185 +HSync -Vsync
> >> xrandr --addmode HDMI-1 $modename
> >> xrandr --output HDMI-1 --mode $modename
>
> >> [Problem with Debian Buster (10.1)]
> >> xrandr --output XWAYLAND1 --mode $modename
> >> xrandr: Configure crtc0 failed
>
> >And I take it you want to reproduce that on Debian 10 (buster). I
> > suggest you:
> > * Install arandr.
> >[...]
>
> Thank you for making me aware of arandr. However, from what I learned:
>
> - arandr is merely a graphical tool for xrandr, so if something does not work with xrandr, arandr will not be able to help
>
> - I did not see any option in the arandr gui to add a non yet existing resolution (and I would like to add a 24Hz reduced blank resolution)
>
> To rephrase my question: How can I enable a custom screen resolution and refresh rate (with my specific modeline) with Debian Buster (Wayland)?
I can't speak for Wayland. When I plug my laptop into a TV¹, I run a
function that sets up the video and sound, which starts:
my-hdmi is a function
my-hdmi ()
{
[ -z "$DISPLAY" ] && printf '%s\n' "No display as not running X$DISPLAY" && return 1;
local Hdmi="$(-gethdminame)";
xrandr --addmode "$Hdmi" 1600x900;
xrandr --output "$Hdmi" --mode 1600x900;
…
where
-gethdminame is a function
-gethdminame ()
{
[ -n "$DISPLAY" ] && printf '%s\n' "$(xrandr | sed -e '/^HDMI/!d;s/ .*//;')"
}
(Sometimes it seems to be HDMI-1, sometimes HDMI1.)
For some reason, our US-bought Samsung TV is coy about revealing its
video modes when compared with the same model in its UK incarnation.
Cheers,
David.
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