Nouveau - Oct 2015 - [Bug 92297] New: dithering detected incorrectly

https://bugs.freedesktop.org/show_bug.cgi?id=92297

            Bug ID: 92297
           Summary: dithering detected incorrectly
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: avi.kivity at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 118681
  --> https://bugs.freedesktop.org/attachment.cgi?id=118681&action=edit
vbios.rom

4.1.8-200.fc22.x86_64
01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [NVS 5200M] (rev
a1)

This is a laptop; the laptop screen displays some colors as flickering
vertically striped patterns, which IRC/imirkin diagnosed as unneeded dithering.
 Disabling dithering with xrandr fixes the issue.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
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 Attachment #118681|text/plain                  |application/octet-stream
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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Please grab a copy of envytools (github.com/envytools/envytools) and also
provide the output of

nvapeek 101000

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--- Comment #2 from Avi Kivity <avi.kivity at gmail.com> ---
00101000: 9f5cb098

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Well, unless I'm misreading the bios (entirely possible), the FP data
pointed
to by the offset in BIT table 'L' suggests that it's not a 8bpc
screen.

bios->fp.strapless_is_24bit =
bios->data[bios->fp.lvdsmanufacturerpointer + 4];

lvdsmanufacturerpointer = 56df

and 0x56e3 == 0. So nouveau is correctly turning on dithering based on the
information available to it. However perhaps that information isn't
trustworthy
for fermi+. Or perhaps there's another bit somewhere.

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

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

--- Comment #4 from Martin Peres <martin.peres at 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/xorg/driver/xf86-video-nouveau/issues/221.

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