Unable to set "Content Type" bit for HDMI and DisplayPort

Submitted by N. W.

Assigned to Nouveau Project

Link to original bug (#104509)

Description

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