[Bug 97888] New: [regression] [i915] [SKL] Tearing / flickering on the drm-intel-nightly branch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97888

            Bug ID: 97888
           Summary: [regression] [i915] [SKL] Tearing / flickering on the
                    drm-intel-nightly branch
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mike at fireburn.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I've bisected back to this commit in the drm-intel-nightly branch

05a76d3d6ad1ee9f9814f88949cc9305fc165460 is the first bad commit 
commit 05a76d3d6ad1ee9f9814f88949cc9305fc165460 
Author: Lyude <cpaul at redhat.com> 
Date:   Wed Aug 17 15:55:57 2016 -0400 

   drm/i915/skl: Ensure pipes with changed wms get added to the state 
…

   If we're enabling a pipe, we'll need to modify the watermarks on all 
   active planes. Since those planes won't be added to the state on 
   their own, we need to add them ourselves. 

   Signed-off-by: Lyude <cpaul at redhat.com> 
   Reviewed-by: Matt Roper <matthew.d.roper at intel.com> 
   Cc: stable at vger.kernel.org 
   Cc: Ville Syrjälä <ville.syrjala at linux.intel.com> 
   Cc: Daniel Vetter <daniel.vetter at intel.com> 
   Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com> 
   Cc: Hans de Goede <hdegoede at redhat.com> 
   Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com> 
   Link:
http://patchwork.freedesktop.org/patch/msgid/1471463761-26796-6-git-send-email-cpaul@redhat.com

The symptoms I'm seeing look like tearing at the top of the screen and it's
especially noticeable in Chrome - reverting this commit makes the issue go away

I'll attach the contents of /sys/kernel/debug/dri/0/i915_ddb_info for working
and not-working when I have access to my machine again

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