[Bug 1641382] [NEW] Nvidia, SDDM, Display port and DVI

[Hans HB Thogersen]

Public bug reported:

Here is my problem:

When I upgrade from Kubuntu 14.04 or Install Kubuntu 16.04 I have a
black screen after the Kubuntu logo disappear during boot.

I have found so that it's a problem with having a DVI and Diaplay port
monitor connected at the same time and using SDDM with Nvidia (both a
GTX970 and 650ti have been tested). I have 4 monitor connected and it's
not a problem with 14.04.

If I change from SDDM to LightDM then I get a login screen and I can
login but the plasma session never start and I get this error in LightDM
log:

[+46.78s] DEBUG: Seat seat0: Failed to find session configuration kde-plasma
[+46.78s] DEBUG: Seat seat0: Can't find session 'kde-plasma'

The funny part is if I don't reboot and go back to SDDM (dpkg-
reconfigure) and restart the SDDM service I get a login screen, can
login and get a plasma session.

The reason I don't believe my problem is related to X or the Nvidia
driver is there is no error in the X nor the Nvidia log. The SDDM log is
empty (zero bytes).

My problem with SDDM is it has problems initialize when both an DVI and
a display port monitor is connected at the same time. If I disconnect
either of them will SDDM work just fine.

I have tried with the "kubuntu" drivers, xorg-edgers drivers, nvidias
own drivers and Cuda 7/8 (because of my graphics needs I need Cuda
installed).

Anybody know how I can fix SDDM black screen or get LightDM to start
plasma5?

** Affects: kubuntu-ppa
     Importance: Undecided
         Status: New

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Title:
  Nvidia, SDDM, Display port and DVI

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