I have a 32" TV and I want to use it as a secondary monitor.

I've been following this guide on how to change the resolution using xorg.conf.

I created three files inside /etc/X11/xorg.conf.d/:


Section "Monitor"
  Identifier  "VGA1"
  Option      "PreferredMode" "1408x792"


Section "Device"
    Identifier      "Intel Integrated"
    Driver          "intel"


Section "Screen"
    Identifier      "Default Screen"
    DefaultDepth  24
    SubSection "Display"
            Depth          24
            Modes         "1408x792"  "1024x768"   "640x480"

It does not work.

It offers me the resolution 1408x792

I tried to apply the resolution but doesn't work. The TV tells me the resolution it's using is 1024x768.

PS. The resolution that I want is 1408x792.

PS2. I configured this months ago but unfortunately lost everything on the hard drive and had to install Fedora 24 from zero today and I don't remember what my xorg.conf looked like. :(

Please, let me know if you have any questions!


Based on my case when i first time using extended monitor with Fedora 25, here how i solve this problem.

First check your gnome session, is it using Wayland or Xorg, you can check it by executing this command

xrandr -q

If it showing your monitor device like Xwayland0 or Xwayland1 you should change to use Xorg.

Second, change your session to use xorg if you're using wayland by edit file at


Then uncomment line on WaylandEnable=false to disable it

# GDM configuration storage

# Uncoment the line below to force the login screen to use Xorg




# Uncomment the line below to turn on debugging

Third restart your machine to take effect

Fourth check your display resolution by running command xrandr -q again, there would be a different information for each device like this

Screen 0: minimum 8 x 8, current 3046 x 1050, maximum 32767 x 32767
LVDS1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   1366x768      60.10*+
   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 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 connected 1680x1050+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00*+  
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

the information above is from mine (it ca be different than yours, just for example)

Fifth as you can see I have no VGA1 resolution bigger than 1024x768, but I need to set my monitor which is connected on VGA1 to have a resolution at 1680x1050, here the tricks

Six Create your own display resolution by using cvt, in this case I want to add resolution 1680x1050

cvt 1680 1050

cvt will produce info like

# 1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHz
Modeline "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync

then for the next step is creating our resolution mode, based on that info

xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync
xrandr --addmode VGA1 "1680x1050_60.00"

as you can see, two commands above will creatie new mode by assign --newmode with display resolution 1680x1050_60.00, and add that resolution mode by using --addmode into my connected monitor on VGA1 (make sure your monitor is connected, check with xrandr -q)

Then for the Last Step, we apply that resolution into our monitor which is in this example is VGA1 by executing this command

xrandr --output VGA1 --mode 1680x1050_60.00

If all step was correct, your monitor display now should be on selected display, you may check it too by running command xrandr -q, and because this instruction is based on my experience, pardon me if this method is still not helpful for you.

*tips If you have a case like when your monitor is just flickering after you set output or add the mode, first backup file on ~/.config/monitors.xml then delete it


I found the answer.

I updated ~/.config/monitors.xml and looked for VGA1 which is my TV and set up correct width and height (1408x792) and after a restart the configuration was applied successfully.

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