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

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

[bugzilla-daemon]

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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@lists.freedesktop.org
          Reporter: nw9165-3201@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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[Bug 104507] Unable to set "Content Type" bit for HDMI and DisplayPort

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

N. W. <nw9165-3201@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Unable to set "IT Content"  |Unable to set "Content
                   |bit for HDMI and            |Type" bit for HDMI and
                   |DisplayPort                 |DisplayPort

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

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

--- Comment #1 from N. W. <nw9165-3201@yahoo.com> ---
PS:

Apparently the NVIDIA driver for Windows supports this as well, see following
screenshot and forum thread for example:

http://abload.de/img/hdmi-content-typebtumj.png
https://forums.geforce.com/default/topic/814785/hdmi-content-type-api-/

Also found something on hdmi.org:

https://www.hdmi.org/manufacturer/hdmi_1_4/content_type.aspx

Apparently there is not just a setting for "IT Content", but for "gaming,
movie, photograph, and text viewing modes".

And the receiving display can alter it's processing settings based on which
type of content it receives.

It would be amazing if that would be possible on Linux as well.

Looks like other Linux users have complained about the lack of such an option
as well:

https://github.com/ValveSoftware/SteamOS/issues/494
https://devtalk.nvidia.com/default/topic/952181/linux/is-hdmi-content-type-supported-in-any-way-/

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

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

--- Comment #2 from N. W. <nw9165-3201@yahoo.com> ---
Any update?

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

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

--- Comment #3 from N. W. <nw9165-3201@yahoo.com> ---
Any update on this one?

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

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

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #4 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/288.

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