[Bug 203889] MacBook UGA issues at login prompt.

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203889

            Bug ID: 203889
           Summary: MacBook UGA issues at login prompt.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dor.bsd at fastmail.fm

This bug is probably related to bug #202730.

I've recently been playing with FreeBSD 11-CURRENT on a 2009 MacBook Pro, since
the work in #202730 allowed me to UEFI boot on that machine.

Everything was fine for a while.

However, when the machine is now booted, everything is OK and output is fine
until the screen is cleared for the login prompt (does it reset the graphics
mode here?), at which time it looks like the kernel has forgotten what the
"stride" is.

This issue started after I put the machine into S3 sleep by closing the lid.
After I woke the machine the screen was blank and I had to reboot (pushed power
button for clean shutdown since nothing was displayed).

After that, the login prompt would always look like the stride was broken
again. Rebooting/powering down and booting an older FreeBSD 11 kernel all
exhibit the same issue.

Perhaps the UGA/UEFI/framebuffer are stuck in a strange state that isn't
cleared on boot?

I haven't yet tried detaching the battery from the MBP to let it truly power
down.

Please let me know if there are more details that I can provide (there probably
are). I should be able to SSH into the machine to examine it in its broken
state.

Cheers,

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