[CLOSED] Dual Monitors - xrandr - Maximize the external monitor

makh · 2017-12-21 15:38:09

Hi

My WM is openbox, while testing these commands.

My monitors, laptop & external, with maximum resolutions:
1. eDP1 --mode 1366x768
2. DP1 --mode 1280x1024

I tried to run, but there were screen problems of display on DP1.

xrandr --output eDP1 --mode 1366x768  --output DP1 --mode 1280x1024

So next, I tried:

xrandr --output eDP1 --mode 1024x768 --output DP1 --mode 1024x768

Ok ... it was okay, working and better than the first one.

Is there a still better way to use higher resolution of the external monitor, ie 1280x1024, to have a better presentation display?

Thankyou

Last edited by makh (2017-12-22 11:53:15)

Trilby · 2017-12-21 17:17:41

What are you actually trying to do? Do you want to mirror the displays, or do you want an extended desktop. For the latter, you need to specify a position for the secondary output.

EDIT: you may find a tool like arandr helpful until you learn more about xrandr.

Last edited by Trilby (2017-12-21 17:22:48)

jasonwryan · 2017-12-21 17:18:45

Moving to NC...

makh · 2017-12-21 21:11:55

Hi

@ Trilby :

Sir! I am trying to get the same display on the external monitor.

I want to use the full resolution ie 1280x1024, of the external. I think that it will be more better, if this is possible. I have tried the options on https://wiki.archlinux.org/index.php/Multihead

Thankyou

Edit:
xrandr gives:

xrandr 
Screen 0: minimum 8 x 8, current 1280 x 1024, maximum 32767 x 32767
eDP1 connected primary 1280x720+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   1366x768      60.00 +  40.00  
   1280x720      60.00* 
   1024x768      60.00  
   1024x576      60.00  
   960x540       60.00  
   800x600       60.32    56.25  
   864x486       60.00  
   640x480       59.94  
   720x405       60.00  
   680x384       60.00  
   640x360       60.00  
DP1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 340mm x 270mm
   1280x1024     60.02*+  75.02  
   1024x768      75.03    75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08

2. arandr doesnt seems to offer what I want to achieve, exactly. It gives lesser options than xrandr.

Last edited by makh (2017-12-21 21:24:28)

Trilby · 2017-12-21 21:23:51

If you want the same thing on both displays, then both displays need to be at the same resolution.

There is a potential exception of using xrandr's transform/scale, but generally these are more trouble than they're worth.

makh · 2017-12-21 21:31:33

Trilby wrote:

...

If I correctly understand, if I connect to a say monitor or a projector of 4000x3000 resolution, ... then I only get to use 1024x768, which is the display of my laptop?

Trilby · 2017-12-21 21:44:54

You could use up to the maximum resolution of your laptop (1366x768) provided the projector supports it.

I'm not sure what's not clear about this, you cannot show the same image on two screens unless they either 1) have the same resolution, or 2) one of them is scaled (and potentially distorted).

This isn't a software constraint, it's a logical constraint.

Last edited by Trilby (2017-12-21 21:45:39)

seth · 2017-12-21 21:50:54

Another problem is that one of your outputs is 16:10 and the other one is 5:4 - how do you ever want them to reasonably display the same image??

makh · 2017-12-22 11:52:38

Hello

Ok ... so I understand that my experiment has no results. The default on my laptop is just a fraction of the big screen but the same resolution, no high resolution usable, in my case.

Thankyou all for your kind guidance.

Goodbye...

Arch Linux

#1 2017-12-21 15:38:09

[CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#2 2017-12-21 17:17:41

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#3 2017-12-21 17:18:45

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#4 2017-12-21 21:11:55

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#5 2017-12-21 21:23:51

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#6 2017-12-21 21:31:33

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#7 2017-12-21 21:44:54

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#8 2017-12-21 21:50:54

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

#9 2017-12-22 11:52:38

Re: [CLOSED] Dual Monitors - xrandr - Maximize the external monitor

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