I am new to ubuntu and I am facing this behavior and don't know what to do. I would appreciate any help.

I am trying to connect external monitor via VGA(I tried even via HDMI,but no use) but not able to connect external monitor in my laptop. I don`t see any option in system settings or any where. I guess my laptop is not detecting external monitor.

When I give xrandar while external monitor is connected, I am getting following error

 xrandr: Failed to get size of gamma for output default
 Screen 0: minimum 1366 x 768, current 1368 x 768, maximum 1368 x 768
 default connected 1368x768+0+0 0mm x 0mm
   1366x768        0.0
   1368x768        0.0*

I am stuck in this issue.

I am using Ubuntu 12.04 and KDE plasma desktop and my laptop model is DELL latitude E5530.

Can somebody create some diagnoses and give some possible solution, please?


At last I found the way. Problem is with "nomodeset" in grub file(/etc/default/grub),

here GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset" here nomodeset shall not be there which is causing the problem. I have changed that line to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and I did "sudo update-grub" and rebooted the machine, it started working as expected.


It seems like issue with the resolution factor.. So first you need to find the the exact monitors and resolution by using the following command:

xrandr -q

Once you got the output, take the current value of your monitor resolution and register the new mode using this command.

xrandr --addmode <your_connection_type> "preferred resolution"

Hope this helps..

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