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 -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to Kubuntu PPA. https://bugs.launchpad.net/bugs/1641382 Title: Nvidia, SDDM, Display port and DVI To manage notifications about this bug go to: https://bugs.launchpad.net/kubuntu-ppa/+bug/1641382/+subscriptions -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs