Cfrtjryk

I'm a new Linux user trying to change the screen resolution as there is no option under display. I have successfully managed to add new resolutions by fluke by following online guide. I don't have a GPU, I don't know if this is the issue? Below is my xrandr -q output.

root@kali:~# xrandr -q

xrandr: Failed to get size of gamma for output default

Screen 0: minimum 1280 x 1024, current 1280 x 1024, maximum 1280 x 1024

default connected 1280x1024+0+0 0mm x 0mm

   1280x1024       0.0* 

  1920x1200_60.00 (0x145)  193.2MHz

        h: width  1920 start 2056 end 2256 total 2592 skew    0 clock   74.6KHz

        v: height 1200 start 1203 end 1209 total 1245           clock   59.9Hz

  1440x900_59.90 (0x156)  106.3MHz

        h: width  1440 start 1520 end 1672 total 1904 skew    0 clock   55.8KHz

        v: height  900 start  901 end  904 total  932           clock   59.9Hz

Here are the steps you need to add a new custom resolution and apply it. Following steps are for adding a 1920x1080 resolution, but you can use it for any other resolution you want. But make sure your monitor and onboard graphics support that resolution.

# First we need to get the modeline string for xrandr

# Luckily, the tool "gtf" will help you calculate it.

# All you have to do is to pass the resolution & the-

# refresh-rate as the command parameters:

gtf 1920 1080 60



# In this case, the horizontal resolution is 1920px the

# vertical resolution is 1080px & refresh-rate is 60Hz.

# IMPORTANT: BE SURE THE MONITOR SUPPORTS THE RESOLUTION



# Typically, it outputs a line starting with "Modeline"

# e.g. "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync

# Copy this entire string (except for the starting "Modeline")



# Now, use "xrandr" to make the system recognize a new

# display mode. Pass the copied string as the parameter

# to the --newmode option:

xrandr --newmode "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync



# Well, the string within the quotes is the nick/alias

# of the display mode - you can as well pass something

# as "MyAwesomeHDResolution". But, careful! :-|



# Then all you have to do is to add the new mode to the

# display you want to apply, like this:

xrandr --addmode VGA1 "1920x1080_60.00"



# VGA1 is the display name, it might differ for you.

# Run "xrandr" without any parameters to be sure.

# The last parameter is the mode-alias/name which

# you've set in the previous command (--newmode)



# It should add the new mode to the display & apply it.

# Usually unlikely, but if it doesn't apply automatically

# then force it with this command:

xrandr --output VGA1 --mode "1920x1080_60.00"

Original source: https://gist.github.com/debloper/2793261

I also wrote a script that does all these steps automatically. You can try it out if the above steps seem too complicated for you: https://gist.github.com/chirag64/7853413

The option --size/-s can be used:

xrandr -s 1440x900

Should work with RandR version 1.1 or newer.

This is what I had to do on an #IntelMaker #Joule in order to make it work in the native resolution with a SUNFOUNDER 7 INCH TFT COLOR MONITOR, which is listed as having 1024*600 resolution, but was picked up as 1280x720 instead.

First, Intel Joule with Linux 4.4.15-yocto-standard x86_64 doesn't seem to have gtf(1), so, I had to use a different machine to calculate the appropriate numbers:

$ gtf 1024 600 60



  # 1024x600 @ 60.00 Hz (GTF) hsync: 37.32 kHz; pclk: 48.96 MHz

  Modeline "1024x600_60.00"  48.96  1024 1064 1168 1312  600 601 604 622  -HSync +Vsync



$ 

Then, create a file with the appropriate commands:

# cat > 1024x600.sh

xrandr --newmode "1024x600_60.00"  48.96  1024 1064 1168 1312  600 601 604 622  -HSync +Vsync

xrandr --addmode HDMI1 "1024x600_60.00"

xrandr --output HDMI1 --mode "1024x600_60.00"

^D

# chmod +x 1024x600.sh

Then, startx or startxfce4, and run ./1024x600.sh, after which, the following will be reported by xrandr(1).

# xrandr

Screen 0: minimum 8 x 8, current 1024 x 600, maximum 32767 x 32767

DP1 disconnected (normal left inverted right x axis y axis)

HDMI1 connected 1024x600+0+0 (normal left inverted right x axis y axis) 697mm x 392mm

   1280x720      60.00 +  50.00    59.94  

   1920x1080     60.00    50.00    59.94  

   1920x1080i    60.00    50.00    59.94  

   1280x1024     75.02  

   1440x900      74.98    59.90  

   1024x768      75.08    70.07    60.00  

   1024x600      60.00  

   800x600       72.19    75.00    60.32    56.25  

   720x576       50.00  

   720x576i      50.00  

   720x480       60.00    59.94  

   720x480i      60.00    59.94  

   640x480       75.00    72.81    60.00    59.94  

   720x400       70.08  

   1024x600_60.00  60.00* 

HDMI2 disconnected (normal left inverted right x axis y axis)

VIRTUAL1 disconnected (normal left inverted right x axis y axis)

# 

I had the same problem. In Display setting maximum resolution was 1280x720.
So:

1. using xrandr command I have seen name of this monitor and resolution list.


2. I 've executed the script: xrandr --output {name of monitor} --mode {resolution}

For example:

xrandr --output DP-2-1 --mode 2560x1440

save this bash script on your desktop and name it xrander then type on terminal (bash xrander.sh 1024 720 60) and press enter!

#!/bin/bash

# xrandr.sh

#If no argument is specified, ask for it and exit

if [[ -z "$@" ]];

then

echo "An argument is needed to run this script";

exit

else

arg="$@"

#Basic check to make sure argument number is valid. If not, display error and exit

if [[ $(($(echo $arg | grep -o "s" | wc --chars) / 2 )) -ne 2 ]];

then

echo "Invalid Parameters. You need to specify parameters in the format "width height refreshRate""

echo "For example setResolution "2560 1440 60""

exit

fi



#Save stuff in variables and then use xrandr with those variables

modename=$(echo $arg | sed 's/s/_/g')

display=$(xrandr | grep -Po '.+(?=sconnected)')

if [[ "$(xrandr|grep $modename)" = "" ]];

then

xrandr --newmode $modename $(gtf $(echo $arg) | grep -oP '(?<="ss).+') &&

xrandr --addmode $display $modename

fi

xrandr --output $display --mode $modename



#If no error occurred, display success message

if [[ $? -eq 0 ]];

then

echo "Display changed successfully to $arg"

fi

fi