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
Created attachment 100571 [details] sddm log
Created attachment 100572 [details] Upgrade log
>The web recommends adding the sddm user to the video group. I'll try out if this works. Didn't help.
Ok, the problem was that the kernel upgrade did not upgrade my nvidia kernel module and therefore said module failed to load (reported in `/var/log/Xorg.0.log`). Fix/Workaround: $ sudo aptitude purge nvidia-361 $ sudo shutdown -r now $ sudo ubuntu-drivers autoinstall I hope I don't have to do this every kernel upgrade.
Upgrading the kernel to 4.4.0-36 worked fine. But I'm not sure whether the nvidia kernel module updated itself or the update wasn't necessary.
You may wish to file a bug report against Ubuntu. We do neither maintain the kernel nor the nvidia driver.