[Bug 101639] [KBL] External display pixelated after upgrade to kernel >= 4.11.0-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101639

--- Comment #3 from Neil Kownacki <njkkow at gmail.com> ---
I did a git bisect on the kernel and here's what it came up with.  I'm
compiling a current mainline kernel with this commit reverted to see if that
fixes the issue for me.  I also noticed a new Lenovo UEFI with "(New) Revert
VBIOS to 1046." in the changes, so I'll try that too and see if it has any
effect.


# first bad commit: [fcc8a22cc9053a8d1bbb94833ec103cd5961feef] drm/edid: Set YQ
bits in the AVI infoframe according to CEA-861-F

commit fcc8a22cc9053a8d1bbb94833ec103cd5961feef
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Wed Jan 11 14:57:25 2017 +0200

    drm/edid: Set YQ bits in the AVI infoframe according to CEA-861-F

    CEA-861-F tells us:
    "When transmitting any RGB colorimetry, the Source should set the
     YQ-field to match the RGB Quantization Range being transmitted
     (e.g., when Limited Range RGB, set YQ=0 or when Full Range RGB,
     set YQ=1) and the Sink shall ignore the YQ-field."

    So let's go ahead and do that. Perhaps there are sinks that don't
    ignore the YQ as they should for RGB?

    I wasn't able to find similar text in CEA-861-E, so it would seem
    to be a fairly "recent" addition.

    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/20170111125725.8086-6-ville.syrjala@linux.intel.com
    Reviewed-by: Jani Nikula <jani.nikula at intel.com>
    Acked-by: Eric Anholt <eric at anholt.net>

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