[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 #31 from Nicolae Carabut <nicolae.carabut at gmail.com> ---
Hi, I can help with debugging the problems, I have two Dell UP2715K running on
Arch Linux @ 5K

My setup looks like this:
2 Dell UP2715K -> 5k
2 Asus MG24U -> 4k

They all are setup like this from left to right: https://goo.gl/sfmUjU

This was possible ONLY because I used the "Xinerama" in "nvidia-settings" and
this is the only 
configuration that worked and allowed me to have 4 monitors up at their native
resolutions.

My GPUs
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP104 [GeForce GTX
1070] [10de:1b81] (rev a1) (prog-if 00 [VGA controller])
03:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP106GL [Quadro
P2000] [10de:1c30] (rev a1) (prog-if 00 [VGA controller])



Before getting to this config I have tried and spend two days of continuous
trial and error with xrandr, notihing worked.
If the monitors were up on then the image will flicker  wildly, if not flicker
the what ever I did the image would how only on one half of the screen the
other one would be black (screen off)


etc, complete misery 


Now, this Xinerama shows up and works @ 5k / 4k , the problem is that if I
start many activities the whole thing becomes slow, noticeably.
I suspect that xrandr (disabled by the xinerama) would work then it would be a
lot faster



So, here, use me, I want these beasts at their best

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