[Bug 91451] New: Apple miniDP-to-VGA adapter doesn't work anymore since Kernel 4.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91451

            Bug ID: 91451
           Summary: Apple miniDP-to-VGA adapter doesn't work anymore since
                    Kernel 4.1
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: AlwaysCarryABible at googlemail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 117341
  --> https://bugs.freedesktop.org/attachment.cgi?id=117341&action=edit
dmesg woutput

Since Kernel 4.1 the Apple miniDP-to-VGA adapter stopped working. If I revert
the following commit the dongle works again:

1d002fa720738bcd0bddb9178e9ea0773288e1dd is the first bad commit
commit 1d002fa720738bcd0bddb9178e9ea0773288e1dd
Author: Simon Farnsworth <simon.farnsworth at onelan.co.uk>
Date: Tue Feb 10 18:38:08 2015 +0000

drm/dp: Use large transactions for I2C over AUX

I was able to reproduce this bug with the nightly build:

Linux note 4.2.0-1-drm-intel-nightly #1 SMP PREEMPT Fri Jul 24 13:19:36 CEST
2015 x86_64 GNU/Linux

Apparently there are more user affected by this bug:
https://bbs.archlinux.org/viewtopic.php?id=199540

miniDP-to-DVI/HDMI still seems to be working (but I can't test that)

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