Message: previous - next
Month: December 2016

Re: [trinity-users] Re: Dual screen setup not remembered

From: "iadest@..." <iadest@...>
Date: Thu, 1 Dec 2016 20:07:54 +0100
OK, this is a sum of 3 scripts I use:


#Test if we are not in dock
if [ -a /dev/video0 ]
	#echo "Going to dock mode!";
	xrandr --output LVDS1 --off
	#xrandr --output VGA1 --mode 1600x1200
	xrandr --newmode "1600x1200b" 180.0   1600 1604 1796 2050 1200
1201 1204 1250 +hsync +vsync
	xrandr --addmode VGA1 1600x1200b
	xrandr --output VGA1 --primary --mode 1600x1200b
	xrandr --addmode DVI1 1600x1200b
	xrandr --output DVI1 --mode 1600x1200b
	xrandr --output DVI1 --right-of VGA1
	#we are not in dock. Check do we have output on VGA

	if [ -n "`xrandr | grep \"VGA1 conected\"`" ] 
		#echo "Going to projector mode!";
		xrandr --output LVDS1 --mode 1024x768 --output VGA1
--mode 1024x768 --same-as LVDS1

There may be problems with newlines. "1201 1204 ..." is the continuing
of previous line. "--mode 1024x768 --same-as LVDS1" is also in previous

WARNING: Do not use this script directly on Your monitor without
checking. High frequency may damage the monitor, especially old CRTs.

So what I'm doing there: first I check for availability of my tuner
card, this card is installed in dock. It computer is in dock, I:
1. Turn the LCD off
2. Set a custom 1600x1200 mode (here called "1600x1200b" for my
monitor which is connected through Sun-VGA adapter and X has no idea
how to handle 1600x1200 on it.
3. Activate it as primary.
4. Activate the second display (DVI) as the one right of VGA monitor.
If I'm not in dock, I look for something connected to VGA port. 
If there is, LCD gets down to 1024x768, and VGA copies it.


Gerhard Zintel <gerhard.zintel@...> napisaƂ(a):

> On Thursday 01 December 2016, deloptes wrote:
> > iadest@... wrote:
> > 
> > > Maybe this solution is not official and proper one, but works:
> > > Put the xrandr commands in a shell script and execute is at
> > > startup.
> > > 
> > > I have such script which detects is my notebook docked first. If
> > > yes, dual-screen configuration for dock outputs are set and
> > > notebook's LCD is turned off.
> > > If it's not docked, script checks for display connected to VGA
> > > port. If it is, it duplicates screen from notebook decreasing
> > > resolutions to 1024x768 as it's usually a projector in a lecture
> > > room and it can't do more.
> > > MCbx
> > 
> > I do the same. In the office I have two additional monitors and at
> > home one. So a shell script is checking what is available and runs
> > xrandr to setup the monitor and resolution.
> > Perhaps this is the reason we never noticed that the settings are
> > not saved and/or applied at tde session startup.
> > In fact I have noticed this on a VM ware recently, but I was
> > thinking it has to do with the vmware.
> > I think it is worth a bug report, so that we may not forget to
> > inspect this.
> Can one of you guys please share that kind of shell script here on
> the list to give me a clue how to start?
> Gerhard
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