How to do fullscreen NetBSD x11 in UTM on a Mac

capa150

NetBSD X11 in UTM starts in a pillarbox 4:3 aspect ratio on Mac and doesn't fill the entire Mac screen. Here's how to fill the screen:

1) Determine desired resolution, e.g. 1280x800 (for a Macbook M1 Air for example). In Display preferences.
2) Boot NetBSD in UTM. At the first presented boot screen, select "3" to "Drop to boot prompt."
3) Type "gop list" to get list of available resolutions.
4) Type "gop 12" (where "12" is whatever listed option you prefer.)
5) Type "boot"

Now when you start X11 it'll fill the Mac's screen.

rvp

capa150 There's another way to do this if UTM supports the vmware emulated VGA card.
Eg., for QEMU:

Start QEMU with -vga vmware (the default is =vga std).

In NetBSD, create a /etc/X11/xorg.conf.d/vmware.conf with

Section "Device"
    Identifier "Card0"
    Driver "vmware"
    Option "HWCursor" "off"
EndSection

Run X, then use xrandr to change resolutions as you like.