[Bug 92297] New: dithering detected incorrectly

[Bug 92297] New: dithering detected incorrectly

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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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-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: avi.kivity-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.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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[Bug 92297] dithering detected incorrectly

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> changed:

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[Bug 92297] dithering detected incorrectly

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #1 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Please grab a copy of envytools (github.com/envytools/envytools) and also
provide the output of

nvapeek 101000

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[Bug 92297] dithering detected incorrectly

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #2 from Avi Kivity <avi.kivity-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
00101000: 9f5cb098

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[Bug 92297] dithering detected incorrectly

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #3 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
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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[Bug 92297] dithering detected incorrectly

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #4 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- 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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