How to remove a custom video mode in VirtualBox
There are quite a few posts around about how to set a custom video mode in VirtualBox, but I didn’t find any about how to remove it. Without removing it, the “auto-resize guest display” option doesn’t appear to work (in my case, the guest always uses the custom video mode instead of the current display size).
First, I went looking for the properties that set the resolution. I found the following on my host:
$ VBoxManage guestproperty enumerate ns001.cdown.local | grep 2048 Name: /VirtualBox/GuestAdd/Vbgl/Video/0, value: 2048x1280x0,0x0,1, timestamp: 1424291930786192000, flags: Name: /VirtualBox/GuestAdd/Vbgl/Video/SavedMode, value: 2048x1280x0, timestamp: 1424291930786592000, flags:
I looked at a host without a custom resolution to see what this usually looks like:
$ VBoxManage guestproperty enumerate chef.cdown.local | grep Video Name: /VirtualBox/GuestAdd/Vbgl/Video/SavedMode, value: 640x480x32, timestamp: 1424177936866662000, flags
This led me to believe that
.../Video/[id] is where custom modes are
stored, since it was not present on a host without any video mode hints.
Then I went to delete the key, only to find that
VBoxManage guestproperty has
$ VBoxManage guestproperty Usage: VBoxManage guestproperty get <uuid|vmname> <property> [--verbose] VBoxManage guestproperty set <uuid|vmname> <property> [<value> [--flags <flags>]] VBoxManage guestproperty delete|unset <uuid|vmname> <property> VBoxManage guestproperty enumerate <uuid|vmname> [--patterns <patterns>] VBoxManage guestproperty wait <uuid|vmname> <patterns> [--timeout <msec>] [--fail-on-timeout]
As it turns out, to delete a key you just set it to a null value (go figure):
set <vm> <property> [<value> [--flags <flags>]]:
This allows you to set a guest property by specifying the key and value. If
<value>is omitted, the property is deleted.
As such, setting the key to a null value will now delete the custom video mode hint, and get automatic resizing working again.
$ VBoxManage guestproperty set ns001.cdown.local /VirtualBox/GuestAdd/Vbgl/Video/0 $ VBoxManage guestproperty enumerate ns001.cdown.local | grep 2048 Name: /VirtualBox/GuestAdd/Vbgl/Video/SavedMode, value: 2048x1280x0, timestamp: 1424291930786592000, flags: