https://bugs.freedesktop.org/show_bug.cgi?id=104508
Bug ID: 104508 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/Radeon 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...
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 RADEON Linux driver.
Can you please add an option to the RADEON Linux driver which allows to enable the "IT Content" bit?
Regards
https://bugs.freedesktop.org/show_bug.cgi?id=104508
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
https://bugs.freedesktop.org/show_bug.cgi?id=104508
--- 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-s...
https://bugs.freedesktop.org/show_bug.cgi?id=104508
--- Comment #2 from N. W. nw9165-3201@yahoo.com --- Any update?
https://bugs.freedesktop.org/show_bug.cgi?id=104508
--- Comment #3 from N. W. nw9165-3201@yahoo.com --- Any update on this one?
https://bugs.freedesktop.org/show_bug.cgi?id=104508
Martin Peres martin.peres@free.fr changed:
What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |MOVED Status|NEW |RESOLVED
--- 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/830.
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