On Fri, 13 Mar 2015, Timo Aaltonen wrote:

> [    37.738] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
> [    37.738] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp 
> pixmaps)
>
> your eyes are lying :)

Well I'm calling my computer a liar... (I guess I'll now have to keep an
eye on it, lest it decides, like HAL did, to take me out)

Yes, I had noticed that the log claims 24, but it is clear when I view
a picture with a gradient that the depth is less. It is also visible in 
the shading of the Unity GUI elements.

If I slide the picture across to the other monitor (same model, attached 
to an Intel card), it displays correctly.

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https://bugs.launchpad.net/bugs/1338068

Title:
  Wrong color depth on Radeon HD 6770

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