[Bug 99137] Weird colours on usb-c to hdmi output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99137

--- Comment #12 from Daniel J Blueman <daniel.blueman at gmail.com> ---
I can reproduce the colour issue on 4.10-rc2 also, but the xrandr "Broadcast
RGB" or 800x600 workarounds above don't work for me. I can't reproduce the
issue on Windows 10 though, so the hardware validates.

I find the adapter I use *does* give correct colours on my 1920x1080 projector,
which reports 12-bit colour depth is in use from the menu. The other devices
(including Dell U2713HM monitor) report only 8-bit colour depth in their EDID,
so I bet the root-cause is either we are still sending 12 BPC data and should
send 8 BPC, or we send 8 BPC but should be sending 12 BPC, and the adapter will
truncate the data accordingly.

Would disabling the EDID check leading to "clamping display bpp (was 36) to
EDID reported max of 24" be a useful test?

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