[Bug 234625] iMac early 2008 garbled screen during install from USB stick

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234625

Jason W. Bacon  changed:

   What|Removed |Added

 Resolution|--- |Overcome By Events
 Status|New |Closed

--- Comment #3 from Jason W. Bacon  ---
The workaround I provided here is adequate for this vintage hardware.

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[Bug 234625] iMac early 2008 garbled screen during install from USB stick

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234625

--- Comment #1 from Jason W. Bacon  ---
Followup:

Must use the same trick when booting from installed system.

To fix add the following to /etc/rc.conf:

kld_list="radeonkms"

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[Bug 234625] iMac early 2008 garbled screen during install from USB stick

[bugzilla-noreply]

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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