[Bug 92977] Display artifacts when using MST

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=92977

--- Comment #3 from Dan Doel <dan.doel@gmail.com> ---
I realized I'd forgotten a couple potentially relevant details.

First, the duplication artifact seems to be related to the overall coordinates.
I switched cables (and thus DP outputs) at the monitors, but putting the
desktop in the same layout gives the same artifacts. Also swapping things so
that the right half of the monitor is logically to the left of the left half
seems to switch the duplication artifacts (i.e. they happen at roughly the same
logical coordinates, not physical coordinates).

Second, my card is a Radeon 7870, for reference.

Also, I've now tried the modesetting driver (so that I can have the tiled
displays work as one logical display), and experience the same anomalies with
it; both color depth mismatch on the left monitor (I previously described it as
'primary', but perhaps it is more relevant that it is the monitor with a +0 X
offset), and the duplication on the right monitor (with a +3840 X offset)
occur. So the problem is not specific to the xf86-video-ati portion of the
driver.

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