[Bug 104507] Unable to set "IT Content" bit for HDMI and DisplayPort

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104507

            Bug ID: 104507
           Summary: Unable to set "IT Content" bit for HDMI and
                    DisplayPort
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nw9165-3201 at yahoo.com

Hi,

apparently the Intel HD Graphics driver for Windows has a "IT Content" option
that can be either enabled or disabled, see following screenshot for example:

https://www.howtogeek.com/wp-content/uploads/2016/12/img_5855c293ac26d.jpg

According to a post on the AVS Forum, enabling "IT Content" does the following:

http://www.avsforum.com/forum/26-home-theater-computers/1477460-theory-about-intel-s-hdmi-quantization-range-setting-full-0-255-a-7.html#post24629922

> HDMI specs "IT Content" flag is set On in video stream.
> 
> CEA-861:
> "In IT applications (e.g. involving bit mapped text),
> each pixel in the source’s frame buffer is most clearly
> displayed if it is directly mapped to a light-emitting pixel
> on the display device - such that adjacent pixels are
> completely independent and do not interact.
> The IT content bit indicates when picture content is
> composed according to common IT practice (i.e. without
> regard to Nyquist criterion) and is unsuitable for
> analog reconstruction or filtering. When the IT content bit
> is set to 1, downstream processors should pass
> pixel data unfiltered and without analog reconstruction."

Apparently there is no option for it on the AMDGPU Linux driver.

Can you please add an option to the AMDGPU Linux driver which allows to enable
the "IT Content" bit?

Regards

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