Multiple screens on debian

debian xrandr

41,332

Solution 1

You might want to take a look at this page, titled: XSF / How to use xrandr. For starters you could try this command:

$ xrandr --output VGA1 --right-of LVDS1

You can control the orientation of the monitors with respect to each other using these switches:

--right-of
--left-of
--above
--below

Solution 2

I had this problem, and it had nothing to do with xfce or debian, but of problem with radeon driver, I didn't have some firmware, so I did this :

dpkg -i firmware-linux-nonfree_0.43_all.deb

Find the firmware here or here:

41,332

S4M

Updated on September 18, 2022

Comments

S4M over 1 year
I have two screens on my computer, but they all show the same image (i.e I can't activate dual screen).

I saw on some blogs that I need to configure xrandr for this, but it fails to do so. Here is the output xrandr returns:
```
sam@BARDT071:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1600 x 1200, maximum 1600 x 1200
default connected 1600x1200+0+0 0mm x 0mm
   1600x1200       0.0* 
   1280x1024       0.0  
   1280x960        0.0  
   1024x768        0.0  
   800x600         0.0  
   640x480         0.0  
```
It seems that only one screen is visible to my Debian system, even though I have two screens displaying something. Any pointers would be appreciated!

EDIT: I run xfce4, and going to Start -> Settings -> Display shows only one screen.
- jordanm almost 11 years
  
  Have you tried the standard Gnome monitor configuration GUI?
- S4M almost 11 years
  
  @jordanm I run xfce4 but I can give it a try.
- jordanm almost 11 years
  
  I think XFCE has something similar in the settings manager.
- S4M almost 11 years
  
  @jordanm yes, see my edit.
- tripleee almost 11 years
  
  A brief X log snippet identifying your display hardware would be helpful. Different display cards and drivers have different features.
- slm almost 11 years
  
  What happens if you try and setup xrandr for both displays? xrandr --output VGA1 --right-of LVDS1
- Gilles 'SO- stop being evil' almost 11 years
  
  Nvidia, ATI or Intel? Which model? Running which driver (proprietary or free)?
- KaP almost 9 years
  
  try arandr. it's very simple gui for xrandr. it should be in debian's repo (packages.debian.org/sid/arandr)
Mahesh over 7 years

$ xrandr --output VGA1 --right-of LVDS1 Gves xrandr: Failed to get size of gamma for output default warning: output VGA1 not found; ignoring