[Bug 97774] New: [APL] Can we support YCbCr 420 output in HDMI 2.0 port?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97774

            Bug ID: 97774
           Summary: [APL] Can we support YCbCr 420 output in HDMI 2.0
                    port?
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mypopydev at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi,
CPU: Skylake Core I series, (i3-6100)

SW Environment: (from 01.org, 2016Q2)
Based on Ubuntu 16.04, and change the Kernel and libraries:
Linux kernel: 4.6
Mesa - 11.2.2
xf86-video-intel - 2.99.917
Libdrm - 2.4.68
Libva - 1.7.1
vaapi intel-driver - 1.7.1
Cairo - 1.15.2
Xorg Xserver - 1.18.3

If we connect the HDMI 2.0 port between our produce and most monitors (support
4K at 60), the monitor shows the resolution 4K at 60 normally.
But if we connect the HDMI 2.0 port between our produce and most TVs (support
4K at 60), the TV just shows the resolution 4K at 30. "xrandr" command doesn't show
4K at 60. 
We also found some TVs just support 4:2:0 YCbCr. Has Linux driver not support
it yet?

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