[Bug 97244] [DP] [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97244

--- Comment #25 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Ricardo Madrigal from comment #24)
> I just tried to reproduce the problem with following configuration:
> 
> KBL NUC, using a MST sunix conected with a mini-DP to DP and 2 connectors
> DP-DP with 2 external monitor (acer) 3840 x 2160 (4K).

...

> Yes, this is still a problem.
> 
> Using 4K, you can connect only one  monitor first, change resolution to
> 1920x1080, then connect the other monitor an change the resolution to the
> same (1920x10180)

So I don't know what you're observing, but the original report is about a very
specific issue. The UP2715K display has two DP inputs to support 5k in a single
display [1]. From the driver perspective, at least currently, they are treated
as two separate displays, while the display may have stricter requirements
about e.g. PLL syncing. I would be rather hesitant to make conclusions about
tests done with two physically separate displays.

[1] http://www.dell.com/ae/business/p/dell-up2715k-monitor/pd

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