Comment # 3
on bug 92977
from Dan Doel
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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