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List:       freedesktop-xorg
Subject:    Re: ATI oss color space compressed in the dark shades of gray
From:       Sebastian Schultz <sebastian2.schultz () st ! ovgu ! de>
Date:       2014-03-16 22:02:52
Message-ID: 10569090.aqytcfKJ3q () arch
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Thanks for the replies, Alex.

I really appreciate all the good hints, but I'm to afraid of messing things=
 up =

because I do not really get what's done in those few lines of code.

I'm just curious after looking into the code: is everyone using a these =

drivers and having some display connected to his/her hdmi port affected? An=
d =

would therefore every ati user possibly benefit from this feature? Or is my =

case just a corner case of hardware not following specs (or somehitng like =

that)?

I hope someone will find some time to get to this new feature soon. Thanks =
for =

all the good work you guys are doing, I'm really impressed with what has =

changed since I last tried the free drivers!

Sebastian


Am Freitag, 14. M=E4rz 2014, 15:42:56 schrieb Alex Deucher:
> On Fri, Mar 14, 2014 at 9:26 AM, Alex Deucher <alexdeucher@gmail.com> wro=
te:
> > On Thu, Mar 13, 2014 at 6:34 AM, Sebastian Schultz
> > =

> > <sebastian2.schultz@st.ovgu.de> wrote:
> >> Is there anything I can do to about it? Or is this an upcoming feature?
> >> Or is it a bug and I should submit a report?
> > =

> > It would be a new feature.  It's not a high priority at the moment, so
> > I'm not sure how quickly we would get to it.
> =

> If you are inclined to play with this yourself, try adjusting the
> registers in dce5_crtc_load_lut(), in particular
> NI_OUTPUT_CSC_CONTROL.NI_OUTPUT_CSC_GRPH_MODE.  Try setting it to
> NI_OUTPUT_CSC_TV_RGB or NI_OUTPUT_CSC_YCBCR_601 or
> NI_OUTPUT_CSC_YCBCR_709.
> =

> Alex
> =

> > Alex
> > =

> >> Sebastian
> >> =

> >> Am Mittwoch, 12. M=E4rz 2014, 12:18:37 schrieb Alex Deucher:
> >>> On Wed, Mar 12, 2014 at 10:31 AM, Sebastian Schultz
> >>> =

> >>> <sebastian2.schultz@st.ovgu.de> wrote:
> >>> > Hello,
> >>> > =

> >>> > first of all: I'm using a Radeon 7750 in combination with a monitor
> >>> > via
> >>> > display port and a tv via the HDMI port. Most of the time I do not
> >>> > want a
> >>> > picture on the tv, only when wathcing videos, so I use xrandr scrip=
ts
> >>> > to
> >>> > switch that display on and off. And here comes my problem:
> >>> > =

> >>> > With the arrival of linux 3.13 to the [core]-repo of arch linux I
> >>> > switched
> >>> > from catalyst to the open source drivers, as they finally provide a
> >>> > sufficient performance. My only problem now is that the colorspace =
is
> >>> > compressed for gray values below 16 (that means every shade of gray
> >>> > having values of 0 to 16 look just black). That's only the case for=
 my
> >>> > HDMI-output connected to my TV, which worked without problems with =
the
> >>> > catalyst drivers. Also, only the dark grays are compressed, the
> >>> > near-white grays show up correct.  My Xorg.0.log shows that the TV =
on
> >>> > HDMI-0 supports the RGB 4:4:4 encoding (just like the monitor does):
> >>> > http://pastebin.com/PF6sjzu1
> >>> > =

> >>> > I found a xrandr-command "--set "Broadcast RGB" "Full"", which can =
be
> >>> > used
> >>> > with chips from Intel. Is there something similar for the open sour=
ce
> >>> > ati
> >>> > drivers?
> >>> =

> >>> Not at the moment.
> >>> =

> >>> Alex
> >> =

> >> _______________________________________________
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