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I am currently using Manjaro (Arch Linux 4.9) and VirtualBox 5.1.26. How am I supposed to set the VM resolution to widescreen (eg. 1366 x 768)?

Thanks!

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    er, if you have the VBox extensions installed on the client host, just set the window to whichever aspect ratio you like.
    – DopeGhoti
    Sep 11, 2017 at 20:13

2 Answers 2

Reset to default
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You can change the resolution using xrandr. Assuming you can still boot up your computer and use Ctrl+Alt+F1 to access a command prompt, you can type this to change to automatic resolution:

xrandr --display :0 --output VGA1 --auto

After the command has finished without any error you can use Ctrl+Alt+F7 to go back to the GUI and it should have the right resolution. Don't forget to change the resolution again, so that the configuration will be saved.

Notes:

  1. You may need to change VGA1 to the name of your display output (type xrandr --display:0 to see the outputs)

  2. If --auto isn't smart enough you can change it to e.g.
    xrandr --display :0 --output VGA1 --mode 1366 x 768
    , which will change the resolution to 1366 x 768 (again, type xrandr --display:0 to see the possible resolution modes).

or

Check for the config file which should be this: ~/.config/xfce4/xfconf/xfce-perchannel-xml/displays.xml

Changed the Resolution line back to 1366 x 768 and i was good:

<property name="Resolution" type="string" value="1366x768"/>
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  • Great to know that your problem was resolved.
    – antzshrek
    Sep 13, 2017 at 15:12
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You can adjust the screen size in VirtualBox with:

Machine > Settings > Display > Scale Factor

(I did this after first doing View > Full-screen Mode)

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