[Bug 101771] New: MacBook Pro 2015 11, 5 - Xorg fatal error on screen detection for kernels 4.10.0+ (and possibly 4.9.8+)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101771

            Bug ID: 101771
           Summary: MacBook Pro 2015 11,5 - Xorg fatal error on screen
                    detection for kernels 4.10.0+ (and possibly 4.9.8+)
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: berglh at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 132652
  --> https://bugs.freedesktop.org/attachment.cgi?id=132652&action=edit
Xorg log for failed boot on Linux 4.10.0 from SSD

I'm experiencing an issue with kernels greater than version 4.10.0 on a 2015
MacBook Pro 11,5 laptop running Ubuntu Gnome 16.04. The newest kernel I've
found so far is 4.9.8, however it appears there are 29 releases between this
and 4.10.0. 

I'm using this as a reference point because of the ability to boot Ubuntu Gnome
17.04 from the LiveUSB key which boots the 4.10.0-19 kernel.

Xorg is stopping with a fatal error on startup, interestingly, this only
happens when booting from the internal SSD. If booting from a LiveUSB key, the
laptop starts up successfully, but there are no Xorg logs available in
/var/logs

I have reached a point now where I'm pretty certain there is either something
wrong with my Xorg configuration (likely), radeon driver or something related
to how Xorg is detecting my displays.

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