How do I change my display to a higher resolution?

momas · 04-14-2017, 01:26 PM

I am a newbie. My computer supports until 3840x2160, although in the Settings it is only up to 1024x768. Please tell me how to change it to a higher resolution. If there is something I need to post, please tell me.

jsbjsb001 · 04-14-2017, 01:39 PM

Quote:

Originally Posted by momas

I am a newbie. My computer supports until 3840x2160, although in the Settings it is only up to 1024x768. Please tell me how to change it to a higher resolution. If there is something I need to post, please tell me.

If your using a NVIDIA based video card in your PC, you can use the following command (as root/superuser), to change it;

Code:

nvidia-xconfig --mode 1366x768

This will change it to 1366x768 screen resolution. Also you need the NVIDIA driver installed for this command to work.

Restart your PC, for changes to take effect.

Shadow_7 · 04-14-2017, 02:08 PM

$ xrandr

$ xrandr --output HDMI-0 --mode 3840x2160

Or whatever name your system calls it. HDMI1 and eDP1 for my hp stream 11. HDMI-0 for my gateway desktop. With multiple displays that command gets longer. Which you likely have since 1024x768 is the lowest common denominator of resolutions available on both displays.

$ xrandr --output HDMI1 --mode 1920x1080 --panning 1920x1080 --primary --output eDP1 --mode 1366x768 --panning 1920x1080+0+0

$ xbacklight -set 0%
$ xset dpms force off
$ xset -dpms s noblank s noexpose

For my hp stream 11 to an external display. With the extra lines to fully turn off the laptops LCD and always on the external display. Which I mostly use for youtube videos. While I do other stuff on the other machine.

momas · 04-14-2017, 02:11 PM

Quote:

Originally Posted by Shadow_7

$ xrandr

$ xrandr --output HDMI-0 --mode 3840x2160

Or whatever name your system calls it. HDMI1 and eDP1 for my hp stream 11. HDMI-0 for my gateway desktop. With multiple displays that command gets longer. Which you likely have since 1024x768 is the lowest common denominator of resolutions available on both displays.

$ xrandr --output HDMI1 --mode 1920x1080 --panning 1920x1080 --primary --output eDP1 --mode 1366x768 --panning 1920x1080+0+0

$ xbacklight -set 0%
$ xset dpms force off
$ xset -dpms s noblank s noexpose

For my hp stream 11 to an external display. With the extra lines to fully turn off the laptops LCD and always on the external display. Which I mostly use for youtube videos. While I do other stuff on the other machine.

I get this when I type :

#xrandr --output HDMI-0 --mode 3840x2160
xrandr: Failed to get size of gamma for output default
warning: output HDMI-0 not found; ignoring
root@debian:/home/rr# xrandr --output HDMI-0 --mode 1920x1080
xrandr: Failed to get size of gamma for output default
warning: output HDMI-0 not found; ignoring

#xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
1024x768 61.00*
800x600 61.00
640x480 60.00

Shadow_7 · 04-14-2017, 02:12 PM

There's arandr if you need more of a GUI approach. And depending on your environment you should be able to right mouse on the background and select properties or display or something to adjust your options. Although I found that lacking relative to xrandr for an ubuntu install I tried once.

The --primary on the previous post so when you full screened something it fills the larger display.

RadicalDreamer · 04-14-2017, 02:28 PM

What is the make and model of your graphics card?

Shadow_7 · 04-14-2017, 05:51 PM

nvidia doesn't play that nice with xrandr it seems...

$ nvidia-xconfig

????? about the only option the proprietary driver gives you I guess. Otherwise --output 0 or --output "Screen 0" might yield results, although not unique and your list of options kind of suck so probably futile.

nvidia-driver: /usr/share/doc/nvidia-driver/html/xrandrextension.html

so... file:///usr/share/doc/nvidia-driver/html/xrandrextension.html
in a web browser might have additional information.

JeremyBoden · 04-14-2017, 07:35 PM

What does the screen support?
Do you have a 4K display?

AwesomeMachine · 04-14-2017, 07:51 PM

If you type:

Code:

$ xrandr

without arguments, it will give you information you require to choose an existing output and what settings are available for that output. If you need to add a resolution

Code:

$ cvt

will give you a modeline for use with xrandr to add the resolution.

You're probably specifying an output that doesn't exist, or maybe referring to it incorrectly. For instance, on my machine

Code:

$ xrandr

yields

Code:

bob@bob:~$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 8192 x 8192
LVDS-1 connected (normal left inverted right x axis y axis)
   1366x768      60.01 +
   1360x768      59.80    59.96  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   960x600       60.00  
   960x540       59.99  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   800x512       60.17  
   700x525       59.98  
   640x512       60.02  
   720x450       59.89  
   640x480       60.00    59.94  
   680x384       59.80    59.96  
   576x432       60.06  
   512x384       60.00  
   400x300       60.32    56.34  
   320x240       60.05  
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected primary 1600x1200+0+0 (normal left inverted right x axis y axis) 408mm x 306mm
   1600x1200     60.00*+
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      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  
DP-1 disconnected (normal left inverted right x axis y axis)

So, even though there is only one HDMI output, it is called HDMI-1, not HDMI-0.

mrmazda · 04-14-2017, 11:31 PM

Quote:

Originally Posted by momas

I am a newbie. My computer supports until 3840x2160, although in the Settings it is only up to 1024x768. Please tell me how to change it to a higher resolution. If there is something I need to post, please tell me.

In order to be seriously helpful we do need more information about your computer and the distribution you installed. Try this command:

Code:

inxi -c0 -v1

If it works, paste its contents back here. If it doesn't, try this one:

Code:

lspci -nnk | grep -A3 VGA

If it works, paste its output, and tell us which distro you installed, and the text content of the titlebar of the settings window where you see your display limited to 1024x768.
Also tell us what kind of cable connects your PC to your display.
Attaching the file /var/log/Xorg.0.log here would be helpful as well.