am seeing this on ubuntu 18.04 with a dell m3800 and OWC thunderbolt 2
dock and 4k iiyama 40 inch screen attach via displayport.

My internal 13inch 4k screen is initialised immediately but the external
monitor tries to sync but often times out.

It looks to me as if this is just an issue with timeouts , surely the
driver can made aware that its trying to sync and external screen so
should allow longer. This seems to be excerbated by my having different
scaling levels on each screen

Sometimes my laptop screen comes back with a strip missing down the side
or the the external monitor is at the wrong resolution.

EVERY time it randommly rearranges my windows and triggers a bug with
scaling in some qt5 apps (virtualbox , notes) where they get scaled up .

Its very annoying having to keep re-arangeing things.

I tried setting monitors.xml to be readonly and it complains , why can i
not fix my layouts ?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-361 in Ubuntu.
https://bugs.launchpad.net/bugs/1615734

Title:
  Multiple monitors broken

Status in nvidia-graphics-drivers-361 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-367 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-375 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-384 package in Ubuntu:
  Confirmed

Bug description:
  I have a Lenovo P50 with Nvidia Optimus (Quadro M1000M), installed with 
Ubuntu 16.04 and the recommended Nvidia drivers (361.42). 
  I added two external monitors connected to DP sockets in the docking station. 
I would like to have display shift to those two monitors when the laptop is 
docked. One monitor has native resolution of 1680x1050 and the other is 
1920x1080. The laptop native resolution is 1920x1080.

  Expected result: 
  laptop monitor shut off, two external monitors running in native resolution, 
display shared on both monitors (not mirrored).

  Process:
  I configured the display using the "Displays" applet in the unity control 
center. However, pressing "Apply" when changing a specific display setting 
(such as resolution, location of screen relative to others, turning on/off), 
results in a long period of darkness, usually followed by display falling back 
to mirroring of all 3 monitors, using a similar-size screen (either low on all 
or high on all with the low-res monitor using panning). The applet remains 
frozen for some time, with the dialog "Is the display ok" open but 
unresponsive. Later I realized this is because there is another dialog of 
"Cannot set screen CRTCXXX" hidden under the two above windows, which needs to 
by ok-ed first.

  Extra:
  I also tried setting the display manually with 'xrandr', which lead to a 
similar result as above - with the "cannot set screen" dialog, and falling back 
to mirroring. This convinced me that the problem is probably with the nvidia 
driver and not the higher plumbing.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: nvidia-361 361.42-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Uname: Linux 4.4.0-34-generic x86_64
  NonfreeKernelModules: symap_custom_dkms_x86_64 nvidia_uvm nvidia_modeset 
nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Aug 22 19:14:55 2016
  InstallationDate: Installed on 2016-07-17 (36 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: nvidia-graphics-drivers-361
  UpgradeStatus: No upgrade log present (probably fresh install)

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