[PD] set screen resolution from within Pd (Linux)

Ingo ingo at miamiwave.com
Tue Jan 12 13:12:22 CET 2021

Thanks a lot, Roman!

I had found xrandr before and it works perfectly with my newer mainboards.
Both the newer and older boards have onboard graphics.

However, when I try to find the display information with "xrandr -q" I get 
only "Can't open display" with no further information.
"xrandr -q -v" gives me only the additional version number (1.3.4 with an old 
Ubuntu, 1.5.0 with Debian 9.5) of xrandr.

Maybe these older mainboards cannot connect to xrandr?
The mainboards are about 10 years old. But xrandr must have been there before.

I'm suspecting that some graphics drivers are missing but I don't know which 
I might have to check if there are any BIOS settings that keep these boards 
from communicating.


> -----Original Message-----
> From: Pd-list [mailto:pd-list-bounces at lists.iem.at] On Behalf Of Roman
> Haefeli
> Sent: Tuesday, January 12, 2021 10:23 AM
> To: pd-list at lists.iem.at
> Subject: Re: [PD] set screen resolution from within Pd (Linux)
> Hi Ingo
> On Tue, 2021-01-12 at 05:46 +0100, Ingo wrote:
> > Is it possible to set the screen resolution from within Pd in Debian
> > (with or without externals)?
> Yes.
> > If yes how?
> With something like (untested example specific to my setup):
> [xrandr --output eDP-1 --mode "1920x1080_60.00"(
> |
> [ggee/shell]
> > My problem is that some older mainboards automatically default to
> > "1280x1024".
> > If I set the screen size in /etc/X11/xorg.conf to "1920x1080" it still
> > shows everything with the lower "1280x1024" resolution.
> > It actually doesn't respond to setting it to a lower resolution either
> > . . .
> That problem is orthogonal to the question of "How can I change screen
> resolution with Pd?". Above answer assumes you're able to change screen
> resolutions with normal tools. If they fail, the Pd solution will fail too.
> > Not sure if I would need different graphic drivers for that.
> > I'm on Debian-9.5.0-i386.
> I don't know, probably not. I experienced a few times, that only very few
> modes were listed by default, but modes added manually would work, too.
> See:
> https://wiki.archlinux.org/index.php/xrandr#Adding_undetected_resolution
> s
> Roman

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