Color and Gradients Banding

[samigina]

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.

[curaga]

Please file a bug.

[oibaf]

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

[samigina]

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?

[curaga]

bugs.freedesktop.org

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

[agd5f]

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.

[Luke]

This looks like not enough video depth

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?

[samigina]

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.

[samigina]

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)