[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

            Bug ID: 99368
           Summary: Full aspect scaling introduces interlacing on specific
                    resolutions
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: gamwizh00@gmail.com

Created attachment 128897
  --> https://bugs.freedesktop.org/attachment.cgi?id=128897&action=edit
dmesg log

When using full aspect scaling in xrandr on a laptop with an A6-6310 apu the
display is showing interlaced lines across the whole display.

This happens only on some of the supported resolutions of the integrated
display, those being 1280x720 and 1152x768.

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

--- Comment #1 from Platin <gamwizh00@gmail.com> ---
Created attachment 128898
  --> https://bugs.freedesktop.org/attachment.cgi?id=128898&action=edit
Xorg log

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

--- Comment #2 from Platin <gamwizh00@gmail.com> ---
Created attachment 128899
  --> https://bugs.freedesktop.org/attachment.cgi?id=128899&action=edit
xrandr --verbose

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

--- Comment #3 from Platin <gamwizh00@gmail.com> ---
Created attachment 128901
  --> https://bugs.freedesktop.org/attachment.cgi?id=128901&action=edit
Image showing interlacing

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

--- Comment #4 from Platin <gamwizh00@gmail.com> ---
The interlacing is not visible on screenshots

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

Platin <gamwizh00@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #128898|0                           |1
        is obsolete|                            |

--- Comment #5 from Platin <gamwizh00@gmail.com> ---
Created attachment 129229
  --> https://bugs.freedesktop.org/attachment.cgi?id=129229&action=edit
Correct Xorg log

Didn't know that GDM doesn't store the Xorg log in the usual location. So I
accidentally uploaded an obsolete log. Replaced it with the correct log.

I tried lower resolutions with the amdgpu driver and the problem shows even
there. So I'm not sure if the problem exists on both drivers or if the source
of the problem lies elsewhere.

Does anyone have an idea?

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

--- Comment #6 from Adam Bolte <abolte@systemsaviour.com> ---
I'm seeing this too. Running a BenQ XL2730Z (2560x1440@144Hz) gaming monitor,
but some games (eg. Prototype 2 under Wine, Saints Row 2) only accept
resolutions up to 1920x1080. They cause GPU scaling to automatically kick in
(the monitor reports the resolution is still 2560x1440) and everything looks
too horrible to look at.

Fury X, Mesa 17.0.1.

If I run the scaling mode with Center instead of Full aspect, everything looks
great (but annoyingly small).

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

--- Comment #7 from Platin <gamwizh00@gmail.com> ---
The issue is fixed on the mainline kernel 4.17.0-rc6 using the amdgpu drm
driver. This was recently fixed it seems since the issue persists on 4.16.11.

It is required to force enable DC though. Without it, it won't work.

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[Bug 99368] Full aspect scaling introduces interlacing on specific resolutions

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https://bugs.freedesktop.org/show_bug.cgi?id=99368

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

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

--- Comment #8 from Martin Peres <martin.peres@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/drm/amd/issues/770.

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