Hey Yosemite!

  $ cat /proc/version
  Linux version 6.0.3 (root@motorshed) (gcc (GCC) 12.2.0, GNU ld (GNU Binutils) 2.39) #1 SMP PREEMPT_DYNAMIC Mon Oct 24 03:50:15 UTC 2022

  $ cat /sys/class/graphics/fb0/virtual_size
  3840,2160

Also getting the 16 bootup penguins using grub's x86_64-efi target;

  $ cat /etc/default/grub
  GRUB_DISABLE_LINUX_UUID=true
  GRUB_DISABLE_LINUX_PARTUUID=false
  GRUB_GFXMODE=3840x2160x32,2560x1440x32,1920x1080x32,1280x800x32,1024x768x32,800x600x32,auto
  GRUB_GFXPAYLOAD_LINUX=keep
  GRUB_TERMINAL_OUTPUT="gfxterm"

It works for other resolutions, or at least 720p and 1080p.

What more is there?

Life is good,
Maurice

... Fidonet 4K - Sweet Sixteen Penguins of the Apocalypse.
--- GNU bash, version 5.2.2(1)-release (x86_64-pc-linux-gnu)