[Bug 110496] New: [GLK] no signal - with samsung 4k TV - HDMI UHD Color (ENABLED)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110496

            Bug ID: 110496
           Summary: [GLK] no signal - with samsung 4k TV - HDMI UHD Color
                    (ENABLED)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: piotr.kasprzak at me.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144072
  --> https://bugs.freedesktop.org/attachment.cgi?id=144072&action=edit
NUC with UHD color enabled at 1080p then I switch resolution to 4k

Hi
For some reason on Gemini Lake NUC - NUC7CJYH
Latest DRM-tip kernel - latest firmware in Samsung QLED 2018
There is no signal if "HDMI UHD color" is enabled for HDMI where is NUC
connected


Here log where is HDMI UHD Color enabled (no signal on TV)
http://ix.io/1GSD

Here where HDMI UHD Color is Disable (no problem)
http://ix.io/1GSG


I Discover its working when is UHD color Enabled and 1080p resolution 
but when you switch to 4k signal gone :( 
I Attached log where I boot NUC with UHD color enabled at 1080p then I switch
resolution to 4k and signal gone




EDID: http://ix.io/1GSV

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