https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234625
Bug ID: 234625
Summary: iMac early 2008 garbled screen during install from USB
stick
Product: Base System
Version: 12.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: j...@freebsd.org
After loading text, data and syms, the screen switches modes and becomes
unreadable. After booting completes you can make out a blue background and
whitish stripe across the middle of the screen which would be the first menu.
By booting into OS X I determined that the iMac has a Radeon GPU.
I was able to get around the problem as follows:
1. After booting to the first menu, type Ctrl+Alt+F4 to get to a shell. The
screen is still garbled here, so this alone does not help.
2. Blindly type "kldload radeonkms". The screen then resets to a readable
state.
I have not tried 11.2 on this machine, but would be willing to if it might help
isolate the issue.
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