[Intel-gfx] No Dithering on HD4600 via DP

[Dihan Wickremasuriya]

Hi All,

I'm using a 6 bit display unit with a native resolution of 1024x600
connected via DP to a box with a Core i7 4770S CPU.  The system is running
kernel 4.2.0 and the X.Org Intel video driver version is 2.99.917. There's
noticeable banding on the screen when displaying images with gradient
fills. Does anyone know whether there are any known dithering issues with
Haswell chips when using a display port?

Thanks,
Dihan
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