I have a 2009 iMac which I have installed Manjaro 20.0.3 XFCE to as a dual boot. (Specifically Apple iMac 21.5-Inch “Core 2 Duo” 3.06 (Late 2009))
It does not handle the screen correctly. I think it is a PCI problem.
Right at the beginning it gets an error PCI -61 (it’s not there for long). It continues on booting and then the screen goes ‘funny’ - it is obviously addressing the screen incorrectly - it shows the screen divided into 4 squares all identical very whitish and hard to read.
The live disk works fine, although mhwd seems to take about 5 minutes. Manjaro installed on an external hard drive (on another computer some time ago) works fine. My copy of Porteus works fine. It’s just this hard disk install that doesn’t.
It’s a fresh install, so I can’t ssh to it. The screen problem is prior to the graphical login so Ctrl-Alt-F? does not help.
I can boot with Porteus or the live disk, but where do I look for clues or make changes?
PS. It’s after 9pm here and I have an early start tomorrow so probably won’t see any replies for a while.