printf '%s\n' '#!/bin/bash' 'xrandr -d $DISPLAY -output eDP -crtc 1' | sudo tee /usr/local/bin/fix_display Next, I created a bash script, /usr/local/bin/fix_display, with the xrandr command above. Uncommenting WaylandEnable=false in /etc/gdm3/nf. In order to allow xrandr to work with GDM3, I had to disable Wayland by Out of the darkness, my desktop appeared. Next I typed: xrandr -d $DISPLAY -output eDP -crtc 1 Of course, I was still running blind so I hit the backspace key to confirm the terminal was open. Next, I typed Ctrl+Alt+t to open Terminal. I let the iMac fully boot up, hit the enter key once to select the default login I couldn't see and typed my password. Building on that, below is the solution that worked for me. While I can't find the original link, someone had already posted the critical xrandr arguments for the 2010 iMac with the Radeon HD 4670. From what I can remember of my previous research over a year ago, this seems to stem from the lack of user-space mode-setting support (UMS) for the old Radeon HD 4670 GPU. I had similar problems with the black / blank screen. With the "nomodeset" option I was able to boot Ubuntu and Lubuntu from a MacBook Pro harddisk. Rebooted and the new settings where in place.
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