https://bugs.kde.org/show_bug.cgi?id=366722

            Bug ID: 366722
           Summary: sddm fails to start after kernel upgrade
           Product: neon
           Version: unspecified
          Platform: Neon Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: neon-b...@kde.org
          Reporter: bernhard+...@scheirle.de
                CC: j...@jriddell.org, neon-b...@kde.org, sit...@kde.org

After the kernel upgrade to version 4.4.0-34 sddm fails to start (black
screen/frozen loading screen)

See attached upgrade and sddm log

Selecting an older kernel (4.4.0-31) in grup and sddm starts again.

sddm log (probably most interesting lines):
Aug 13 07:12:39 Blackbox sddm-greeter[2920]: QXcbIntegration: Cannot create
platform OpenGL context, neither GLX nor EGL are enabled
Aug 13 07:12:39 Blackbox sddm-greeter[2920]: Failed to create OpenGL context
for format QSurfaceFormat(version 2.0, options QFlags(), depthBufferSize 24,
redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1,
stencilBufferSize 8, samples -1, swapBehavior 2, swapInterval 1, profile  0) 

The web recommends adding the sddm user to the video group. 
I'll try out if this works.



Reproducible: Always

Steps to Reproduce:
1. Boot with kernel 4.4.0-31 (maybe requires an nvidia card with proprietary
drivers)

Actual Results:  
Black screen. Somtimes the last image of the loading screen.
Switching to tty1 works.

Expected Results:  
A login screen.

System:
KDE Neon User Editon
Nvidia Driver: 361.42

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