[Bug 98046] New: iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98046

            Bug ID: 98046
           Summary: iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs
                    nomodeset to boot
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: freedbug at jungers.net
        QA Contact: xorg-team at lists.x.org

Created attachment 127000
  --> https://bugs.freedesktop.org/attachment.cgi?id=127000&action=edit
Xorg.log of a failed boot

My iMac11,1 was running Ubuntu since the beginning and till 14.04 fine but gave
a black screen, with sometimes horizontal lines flowing since 15.04.

After applying the Apple patches Mac EFI Security Update 2015-002
(https://support.apple.com/kb/DL1848?locale=en_US) and 27-inch iMac SMC
Firmware Update 1.0 (https://support.apple.com/kb/DL1030?locale=en_US), my iMac
was unable to boot in graphical mode without the nomodeset kernel parameter.

Grub console is sluggish (but not for Ubuntu 11.10 and 12.04), sleep doesn't
work and overall graphic performances are bad.

I had to install OSX El Capitan for flashing the iMac and I didn't have issues
in OSX.

I join an Xorg.log of a failed boot (without nomodeset).

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