I can't think of a good solution here, but if you would like the same
"safe graphics" mode that also happens to disable the GPU, then you can
edit /etc/default/grub and change:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

and then run:

  sudo update-grub

and reboot. Though performance will be poor.

** Package changed: xorg (Ubuntu) => linux-hwe-6.2 (Ubuntu)

** Also affects: mutter (Ubuntu)
   Importance: Undecided
       Status: New

** Tags added: radeon

** Summary changed:

- Four Screens
+ [radeon] iMac a1311 is split into four screens

-- 
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/2037340

Title:
  [radeon] iMac a1311 is split into four screens

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