[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

            Bug ID: 104090
           Summary: Reduced colors on RX580 through eDP on Asus GL702ZC
                    laptop
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: hp@tmm.cx

When enabling DC on the RX580 on Linux 4.15.0-rc2 I get a reduced color palette
compared to having DC turned off. 

My setup: 
Fedora 27
Xorg 1.19.5
Xorg drivers amdgpu 1.3.0
Linux 4.15.0-rc2

Attached you will find dmesg, xorg, and xrandr output with and without DC along
with 2 pictures with and without dc for the results that I'm talking about.

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #1 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135946
  --> https://bugs.freedesktop.org/attachment.cgi?id=135946&action=edit
Without DC: Gnome shell overview

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #2 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135947
  --> https://bugs.freedesktop.org/attachment.cgi?id=135947&action=edit
DC: Gnome shell overview

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #3 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135948
  --> https://bugs.freedesktop.org/attachment.cgi?id=135948&action=edit
DC: Gnome shell shutdown dialog

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #4 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135949
  --> https://bugs.freedesktop.org/attachment.cgi?id=135949&action=edit
Without DC: Gnome shell shutdown dialog

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 326 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #5 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135950
  --> https://bugs.freedesktop.org/attachment.cgi?id=135950&action=edit
Without DC: xrandr --prop output

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #6 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135951
  --> https://bugs.freedesktop.org/attachment.cgi?id=135951&action=edit
Without DC: Xorg.log

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #7 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135952
  --> https://bugs.freedesktop.org/attachment.cgi?id=135952&action=edit
Without DC: dmesg -T

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 318 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #8 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135953
  --> https://bugs.freedesktop.org/attachment.cgi?id=135953&action=edit
DC: xrandr --prop output

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #9 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135954
  --> https://bugs.freedesktop.org/attachment.cgi?id=135954&action=edit
DC: Xorg.log

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 307 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #10 from Hein-Pieter van Braam <hp@tmm.cx> ---
Created attachment 135955
  --> https://bugs.freedesktop.org/attachment.cgi?id=135955&action=edit
DC: dmesg -T

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com,
                   |                            |jordan.lazare@amd.com

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
The EDID says 6 bits per channel, maybe DC doesn't enable dithering.

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #12 from Hein-Pieter van Braam <hp@tmm.cx> ---
How do I establish whether that is what is happening or not? It sure looks like
that's what's going on though.

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #13 from Harry Wentland <harry.wentland@amd.com> ---
Created attachment 136035
  --> https://bugs.freedesktop.org/attachment.cgi?id=136035&action=edit
Fix truncate programming

Does this help? Haven't had a chance to test it myself but this code looked
obviously wrong.

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #14 from Hein-Pieter van Braam <hp@tmm.cx> ---
I applied attachment 136035 to 4.15.0-rc2 but the problem remained with dc=1 on
my rx580 I'm afraid.

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #15 from Hein-Pieter van Braam <hp@tmm.cx> ---
I just upgraded to 4.16.0-rc1 and the problem is still there with dc=1

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

--- Comment #16 from Hein-Pieter van Braam <hp@tmm.cx> ---
It appears that 4.16.0-rc7 fixed the issue on this laptop. I'll do a bit more
testing but it seems on par with a system without dc now. Great stuff.

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[Bug 104090] Reduced colors on RX580 through eDP on Asus GL702ZC laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=104090

Harry Wentland <harry.wentland@amd.com> changed:

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

--- Comment #17 from Harry Wentland <harry.wentland@amd.com> ---
Thanks for testing. I'll set this to resolved. If you still see issues feel
free to reopen.

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