Whenever I set up Linux guests inside VirtualBox, I usually just start them in the background (Shift + double click in VirtualBox Manager) and then
So as part of my standard setup for a VM, I now do
> VBoxManage setextradata "Debian 9" "CustomVideoMode1" "1200x900x24"
where "Debian 9" is the name of the virtual machine I want to change and 1200x900x24 is 1200×900 pixel at 24 bpp resolution.
Then I update the kernel args with video=1200x900-241)Check the Linux Kernel documentation for the full video option format by modifying the bootloader configuration. In case of GRUB, one can change GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub2)See the Grub Manual for reference. and then issue
> sudo update-grub
Don’t forget to reboot the VM for changes to take effect. If for some reason the new resolution isn’t available, check with
> sudo hwinfo --framebuffer ... Mode 0x0360: 1200x900 (+3600), 24 bits ...
Using older bootloaders or other bootloaders might need to use the hexadecimal mode number, 0x0360 above, instead of the resolution and bit-depth.
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