On the other hand, maybe we need to treat disabling the default colour
profile as a workaround.

I forgot to mention that in at least one case I noticed similar problems
in web browsers and image viewers even when using a properly custom
calibrated profile for my display.

So a real fix might have to come in the apps themselves, or maybe just
one or two image decoding libraries that are misinterpreting the profile
data (maybe they don't know or expect the whole compositor is applying
the profile already?). To do this someone would need to dig into the
code of an affected app and see how/where it is using the colour profile
data.

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https://bugs.launchpad.net/bugs/1785764

Title:
  Ubuntu default colour profile distorts colours on some machines (white
  looks green, too dark, or under-saturated)

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