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Thread: Color and Gradients Banding

  1. #1
    Join Date
    Feb 2014
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    Default Color and Gradients Banding

    When using the open driver for my graphic card (Radeon HD 6520G, on APU A6-3400m) I get ugly gradients and color banding (see the image). Everything fine and smooth with Catalyst.

    I want to stay with the open drivers, but this issue is driving me crazy.

    I have tested with kernels 3.10, 3.11, 3.12 and 3.13. With and without DPM.


  2. #2
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    Feb 2008
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    Default

    Please file a bug.

  3. #3

    Default

    I had a similar problem on my X1600 on a MacBook Pro. It was indeed fixed after I reported the bug.

  4. #4
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    Feb 2014
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    Default

    Quote Originally Posted by curaga View Post
    Please file a bug.
    Cant you point me to the right place to submit the bug? What should I attach to it? Some log relevant for the issue?

  5. #5
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    bugs.freedesktop.org

    Component is the xorg driver xf86-video-ati probably. Attach your screenshot, describe system versions (kernel, X, mesa, xf86-video-ati).

  6. #6
    Join Date
    Dec 2007
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    Default

    https://bugs.freedesktop.org Product: DRI, Component: DRM/Radeon. Display setup is done in the kernel so it's probably a kernel driver issue. Attach your xorg log and dmesg output.

  7. #7
    Join Date
    May 2013
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    557

    Default This looks like not enough video depth

    Quote Originally Posted by samigina View Post
    When using the open driver for my graphic card (Radeon HD 6520G, on APU A6-3400m) I get ugly gradients and color banding (see the image). Everything fine and smooth with Catalyst.

    I want to stay with the open drivers, but this issue is driving me crazy.

    I have tested with kernels 3.10, 3.11, 3.12 and 3.13. With and without DPM.

    Have you tried forcing video depth to 24 in xorg.conf ? This looks like what you see when you constrain the number of colors in an image. I saw effects like that when I was toyng with video depth (to save video ram) on a Pentium 3 450 MHZ I was trying to force to play VGA video and simultaniously support a 1080p screen. At a depth of 15 this effect was prominant, it was not at a depth of 16. Normal video depth is almost always 24, wonder if your card/driver combination is defaulting to a lower depth?

  8. #8
    Join Date
    Feb 2014
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    Default

    It seemls like theres already a bug about this issue:

    https://bugs.freedesktop.org/show_bug.cgi?id=73911

    Im gonna review the depth color in my xorg. I will report the result.

  9. #9
    Join Date
    Feb 2014
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    Default

    MyXorg.log says 24 bits color depth, so I guess that is not the problem:

    RADEON(0): Creating default Display subsection in Screen section
    "Default Screen Section" for depth/fbbpp 24/32
    [ 24.292] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
    [ 24.292] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps)
    [ 24.292] (==) RADEON(0): Default visual is TrueColor
    [ 24.292] (==) RADEON(0): RGB weight 888
    [ 24.292] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)

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