Nouveau - Jan 2018 - [Bug 104509] New: Unable to set "Content Type" bit for HDMI and DisplayPort

https://bugs.freedesktop.org/show_bug.cgi?id=104509

            Bug ID: 104509
           Summary: Unable to set "Content Type" bit for HDMI and
                    DisplayPort
           Product: xorg
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: nw9165-3201 at yahoo.com
        QA Contact: xorg-team at lists.x.org

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 nouveau Linux driver.

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

Regards

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--- Comment #1 from N. W. <nw9165-3201 at 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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--- Comment #2 from N. W. <nw9165-3201 at yahoo.com> ---
Any update?

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

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--- Comment #4 from TabethaHoye <zongdatasims at gmail.com> ---
You are right, I have experienced this problem and fixed it by watching videos
on youtube which https://www.bestdissertation.com/services/coursework.html
provides best option for quality work. There is an option on your graphics
driver which is named as default settings. You can change it by updating
different settings and shades.

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

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

--- Comment #5 from Martin Peres <martin.peres at free.fr> ---
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This bug has been migrated to freedesktop.org's GitLab instance and has been
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https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/399.

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