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I just installed 12.10 on a mid-2012 13" Macbook Pro and I've noticed that gradients on-screen exhibit slight banding problems. The system says it's running 24-bit colour but it seems more like 16-bit.

How should I go about troubleshooting this? Is it the kernel? Intel gfx drivers?

Thanks

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From https://wiki.archlinux.org/index.php/ICC_Profiles I managed to find the default icc profile in OSX and use xcalib to load it.

e.g. /usr/bin/xcalib -d :0 /home/username/icc/Color LCD-00000610-0000-9CC7-0000-0000042731C0.icc

For some reason, when I run that from command-line I need to restart X (I just suspend to RAM and wake it again) before I notice the changes.

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    Turns out xcalib wasn't doing anything. I removed xcalib, rebooted and suspended the machine and the colour profile was fixed. SO, there's something about suspending the machine that gets the colour profile on the right track...
    – Tron
    Nov 22, 2012 at 17:00

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