How To Make Debian Linux Fullscreen in Hyper-V

debian-fullscreen-in-hyperv.md

1. Run sudo vim /etc/default/grub
2. Find GRUB_CMDLINE_LINUX_DEFAULT
3. Append video=hyperv_fb:[the resolution you want], for example: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=hyperv_fb:1920x1080"
4. Write the changes, quit Vim
5. Run sudo update-grub
6. Run sudo reboot

h/t https://blogs.msdn.microsoft.com/virtual_pc_guy/2014/09/19/changing-ubuntu-screen-resolution-in-a-hyper-v-vm/

I my case all this didn't helped with Debian 12 but I found a solution on here:
https://forums.linuxmint.com/viewtopic.php?t=400584

Note: The VM must be turned off to change this setting!
You need the adjust the resolution of the VM in the HyperV VM-Settings with the following command:
set-vmvideo -vmname -horizontalresolution:xxxx -verticalresolution:xxxx -resolutiontype single

After that you can start the VM and first it will be still in 1980x1080 but after that you will find the resolution in your Debian Display Settings and can adjust it there.

Thanks anyway for all the other steps of the solution!