[Bug 72087] New: Black levels incorrect during video playback at first

[Bug 72087] New: Black levels incorrect during video playback at first

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

          Priority: medium
            Bug ID: 72087
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Black levels incorrect during video playback at first
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: pyrodex@gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 89920
  --> https://bugs.freedesktop.org/attachment.cgi?id=89920&action=edit
Xorg log file

I am currently running XBMC nightly and have been working with fritsch via the
XBMC forums to diagnose this issue. My current setup is as follows:

AMD A6-3500 APU with Radeon(tm) HD Graphics
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
BeaverCreek [Radeon HD 6530D]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek HDMI
Audio [Radeon HD 6500D and 6400G-6600G series]

Ubuntu 13.10 running 2.13-rc1 with mesa git
(10.0~git201311181342.37827~ubuntu13.10.1)

My HTPC is connected to a Denon AVR-991 then connected to a Panasonic 50"
Plasma. The Denon is setup for 0-255 levels and the HTPC via XBMC is set for
16-235 due to it being "darker" than normal after the leap from windows.
Recently I've added an xrandr setting to turner Dither to ON since before the
setting it would occasionally switch black levels through video play and with
the new setting it ONLY does it on startup of video playback and then corrects
itself 2-3 seconds later. 

I am in the process of taking a video now for reference and will upload it
later today.

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #1 from pyrodex <pyrodex@gmail.com> ---
Video can be found at http://youtu.be/lTUtw0onSCw and the issue is observed
around 9-10 second mark.

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #2 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to comment #1)
> Video can be found at http://youtu.be/lTUtw0onSCw and the issue is observed
> around 9-10 second mark.

That looks like some auto level thing like C.A.T.S - is that turned on on the
Panny for that input?

Unlike Windows I don't think OSS Radeon will do anything other than full range
RGB over HDMI - I would investigate the "dark" issue as perhaps setting XBMC
not to scale to full range may be confusing something that's trying to
automagically tweak things for you - Denon or TV - I don't know, but it's
normal for 16 - 235 luma to have samples that are below/above which usually get
corrected by the stretch to full range.

PS How did you add dither to xrandr?

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #3 from pyrodex <pyrodex@gmail.com> ---
Thanks for the feedback Andy. 

The Denon and the Panasonic are both in "Extended (0-255)" and it seems in the
upcoming XBMC release you can adjust the levels. By default XBMC was set to
0-255 and I noticed the VERY dark scenes and settings so they suggesting
changing XBMC to 16-235. Before I know about the XBMC setting I changed the
Denon to 16-235 and it fixed the darkness issue. I have these same two machines
with IDENTICAL hardware, etc. but the second unit which is upstairs in my
Bedroom is attached to an LG 32" LCD TV and has the same issue. The ONLY common
point between the two setups is a Griffin HDMI detective to prevent issues I've
seen in the past when I shut off the TVs(and AVR) and leave the units running.
The only thing I've changed in this equation was the leap to Linux from Windows
with the OSS drivers for radeon. 

FYI I used "xrandr --output HDMI-0 --set dither On" in my startup script after
X started. 

Any recommendations is welcome.

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #4 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to comment #3)
> Thanks for the feedback Andy. 
> 
> The Denon and the Panasonic are both in "Extended (0-255)" and it seems in
> the upcoming XBMC release you can adjust the levels. By default XBMC was set
> to 0-255 and I noticed the VERY dark scenes and settings so they suggesting
> changing XBMC to 16-235. Before I know about the XBMC setting I changed the
> Denon to 16-235 and it fixed the darkness issue. I have these same two
> machines with IDENTICAL hardware, etc. but the second unit which is upstairs
> in my Bedroom is attached to an LG 32" LCD TV and has the same issue. The
> ONLY common point between the two setups is a Griffin HDMI detective to
> prevent issues I've seen in the past when I shut off the TVs(and AVR) and
> leave the units running. The only thing I've changed in this equation was
> the leap to Linux from Windows with the OSS drivers for radeon. 
> 
> FYI I used "xrandr --output HDMI-0 --set dither On" in my startup script
> after X started.

Thanks, though it doesn't work for me (throws an error) , not sure why.

> 
> Any recommendations is welcome.

Other than trying with direct connections to TV and/or a different player I am
afraid I can't really think of anything else.

For me with an HD4890 directly into a 2010 Panasonic plasma I have no issues.

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #5 from pyrodex <pyrodex@gmail.com> ---
Today I tested out by removing the HDMI Detective between the bedroom HTPC and
the LG 32" LCD TV. My dithering xrandr option is still enabled and the XBMC
16-235 levels are still configured. I tested a few videos and still was able to
notice the "grey to normal" transition for the first few seconds of the video
playback start. So now I have a STRAIGHT HDMI connection to the TV and still
experiencing the same issues. Thoughts?

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #6 from Alex Deucher <agd5f@yahoo.com> ---
The dithering option has nothing to do with channel clamping, it's for
dithering when displaying 8 or 10 bpc content on 6bpc panels for example.

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

--- Comment #7 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to comment #5)
> Today I tested out by removing the HDMI Detective between the bedroom HTPC
> and the LG 32" LCD TV. My dithering xrandr option is still enabled and the
> XBMC 16-235 levels are still configured. I tested a few videos and still was
> able to notice the "grey to normal" transition for the first few seconds of
> the video playback start. So now I have a STRAIGHT HDMI connection to the TV
> and still experiencing the same issues. Thoughts?

I would try the direct connection without the dithering or 16-235 xbox setting
to see if you still have the dark issue, and if not maybe the level issue will
be gone also.

I would also try with another player like mplayer.

Do you have issues with this mpeg2 full range ramp?

I would try with current set up and normal settings/different player etc.

http://www.w6rz.net/ramp.zip

Of course normally (= player stretching 16-235 to full) the end 2 blocks will
be the same, if xbmc is managing to use full range then they won't be.

What you see will also depend to some extent on the levels
(brightness/contrast) set on the TV.

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[Bug 72087] Black levels incorrect during video playback at first

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https://bugs.freedesktop.org/show_bug.cgi?id=72087

Christopher M. Penalver <christopher.m.penalver@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED
                 CC|                            |christopher.m.penalver@gmai
                   |                            |l.com

--- Comment #8 from Christopher M. Penalver <christopher.m.penalver@gmail.com> ---
Pyrodex, Ubuntu 13.10 reached EOL on July 17, 2014. For more on this, please
see https://wiki.ubuntu.com/Releases.

If this is reproducible with a supported release, it will help immensely if you
filed a new report with Ubuntu by ensuring you have the package xdiagnose
installed, and that you click the Yes button for attaching additional debugging
information running the following from a terminal:
ubuntu-bug xorg

Also, please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.

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