[Bug 97244] New: [SKL] 5k tiled monitor DP sync issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97244

            Bug ID: 97244
           Summary: [SKL] 5k tiled monitor DP sync issues
           Product: DRI
           Version: DRI git
          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: bugs at bzatek.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125593
  --> https://bugs.freedesktop.org/attachment.cgi?id=125593&action=edit
picture of the corruption

(this is a split-off from bug 95207 after solving modelines detection)

While modelines are properly detected now and native resolution can be set, the
monitor shows corrupted image (see attached photo).

This is reproducible anytime with random level of corruption. So far I have
never been able to get proper stable image. Lower resolutions (via single DP
cable) work fine, so does Windows in native resolution (dual DP).

No interesting messages in the logs either, attached below.

This is Dell UP2715K, a 5k tiled monitor connected via two DP ports on a C236
board running Skylake Xeon.

I'll hang on IRC on #intel-gfx (nick: tbzatek) for direct debugging.

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