[Bug 101679] New: [regression] display corruption since bb0f4aab0e7677e9

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101679

            Bug ID: 101679
           Summary: [regression] display corruption since bb0f4aab0e7677e9
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tjaalton at ubuntu.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

We've bisected an issue with kernels since

commit bb0f4aab0e7677e91cde443fecc18e71fbb85038
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date: Fri Jan 20 20:21:59 2017 +0200

    drm/i915: Track full cdclk state for the logical and actual cdclk
frequencies


Attaching a 4k monitor via a TB dock to a certain KBL machine results in
display corruption similar to this:

https://photos.google.com/share/AF1QipNgcr1DzxLQE40mUrNj_vbZUz_hfcsrsRONqHt-t01tjWsDDQzPfcigCN0BC5lkpg?key=YjRfZk03cFBDeUtYakRFdFVaRGdGLUQzcHhxNjZB

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