This is just a notice to others who may run into this.... I just updated a system where I use the nVidia drivers from rpmfusion.  After the update I could not get a login screen.  Just a mouse cursor on a black background.  I found there to be an selinux AVC. type=AVC msg=audit(1527130068.596:164): avc:  denied  { map } for  pid=1205 comm="sddm-greeter" path="/dev/nvidiactl" dev="devtmpfs" ino=17300 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:xserver_misc_device_t:s0 tclass=chr_file permissive=0 Ran... ausearch -c 'sddm-greeter' --raw | audit2allow -M my-sddmgreeter semodule -X 300 -i my-sddmgreeter.pp to fix the problem. The transaction of the update was for the following.     Upgraded gstreamer1-1.14.0-1.fc28.x86_64     Upgrade             1.14.1-1.fc28.x86_64     Upgraded ibus-table-1.9.18-2.fc28.noarch     Upgrade             1.9.20-1.fc28.noarch     Upgraded ibus-table-devel-1.9.18-2.fc28.noarch     Upgrade                   1.9.20-1.fc28.noarch     Erase    kernel-4.16.7-300.fc28.x86_64           Install  kernel-4.16.10-300.fc28.x86_64         Erase    kernel-core-4.16.7-300.fc28.x86_64     Install  kernel-core-4.16.10-300.fc28.x86_64     Erase    kernel-devel-4.16.7-300.fc28.x86_64     Install  kernel-devel-4.16.10-300.fc28.x86_64     Upgraded kernel-headers-4.16.9-300.fc28.x86_64     Upgrade                 4.16.10-300.fc28.x86_64     Erase    kernel-modules-4.16.7-300.fc28.x86_64     Install  kernel-modules-4.16.10-300.fc28.x86_64     Erase    kernel-modules-extra-4.16.7-300.fc28.x86_64     Install  kernel-modules-extra-4.16.10-300.fc28.x86_64     Erase    kmod-nvidia-4.16.7-300.fc28.x86_64-3:390.48-1.fc28.x86_64     Upgraded libepoxy-1.5.1-1.fc28.x86_64                                Upgrade           1.5.2-1.fc28.x86_64                               Upgraded libgnomekbd-3.26.0-4.fc28.x86_64                          Upgrade              3.26.0-5.fc28.x86_64                         Upgraded libidn2-2.0.4-7.fc28.x86_64                             Upgrade          2.0.5-1.fc28.x86_64                            Upgraded libipa_hbac-1.16.1-4.fc28.x86_64                      Upgrade              1.16.1-8.fc28.x86_64                     Upgraded libkworkspace5-5.12.5-1.fc28.x86_64                 Upgrade                 5.12.5-3.fc28.x86_64                Upgraded libsss_autofs-1.16.1-4.fc28.x86_64                Upgrade                1.16.1-8.fc28.x86_64               Upgraded libsss_certmap-1.16.1-4.fc28.x86_64             Upgrade                 1.16.1-8.fc28.x86_64            Upgraded libsss_idmap-1.16.1-4.fc28.x86_64             Upgrade               1.16.1-8.fc28.x86_64            Upgraded libsss_nss_idmap-1.16.1-4.fc28.x86_64       Upgrade                   1.16.1-8.fc28.x86_64                       Upgraded libsss_simpleifp-1.16.1-4.fc28.x86_64                      Upgrade                   1.16.1-8.fc28.x86_64                     Upgraded libsss_sudo-1.16.1-4.fc28.x86_64                         Upgrade              1.16.1-8.fc28.x86_64                        Upgraded libwacom-0.28-3.fc28.x86_64                            Upgrade           0.30-1.fc28.x86_64                           Upgraded libwacom-data-0.28-3.fc28.noarch                     Upgrade                0.30-1.fc28.noarch                    Upgraded nodejs-1:8.11.0-1.fc28.x86_64                      Upgrade         1:8.11.2-1.fc28.x86_64                     Upgraded npm-1:5.6.0-1.8.11.0.1.fc28.x86_64               Upgrade      1:5.6.0-1.8.11.2.1.fc28.x86_64              Upgraded pam-1.3.0-10.fc28.x86_64                       Upgrade      1.3.1-1.fc28.x86_64                       Upgraded plasma-discover-5.12.5-1.fc28.x86_64         Upgrade                  5.12.5-2.fc28.x86_64        Upgraded plasma-discover-flatpak-5.12.5-1.fc28.x86_64              Upgrade                          5.12.5-2.fc28.x86_64             Upgraded plasma-discover-libs-5.12.5-1.fc28.x86_64               Upgrade                       5.12.5-2.fc28.x86_64              Upgraded plasma-lookandfeel-fedora-5.12.5-1.fc28.noarch        Upgrade                            5.12.5-3.fc28.noarch       Upgraded plasma-workspace-5.12.5-1.fc28.x86_64               Upgrade                   5.12.5-3.fc28.x86_64              Upgraded plasma-workspace-common-5.12.5-1.fc28.x86_64      Upgrade                          5.12.5-3.fc28.x86_64     Upgraded plasma-workspace-geolocation-5.12.5-1.fc28.x86_64      Upgrade                               5.12.5-3.fc28.x86_64     Upgraded plasma-workspace-geolocation-libs-5.12.5-1.fc28.x86_64      Upgrade                                    5.12.5-3.fc28.x86_64     Upgraded plasma-workspace-libs-5.12.5-1.fc28.x86_64                Upgrade                        5.12.5-3.fc28.x86_64               Upgraded plasma-workspace-wayland-5.12.5-1.fc28.x86_64           Upgrade                           5.12.5-3.fc28.x86_64          Upgraded python3-sss-1.16.1-4.fc28.x86_64                      Upgrade              1.16.1-8.fc28.x86_64                     Upgraded python3-sssdconfig-1.16.1-4.fc28.noarch             Upgrade                     1.16.1-8.fc28.noarch            Upgraded qt-1:4.8.7-36.fc28.x86_64                         Upgrade     1:4.8.7-40.fc28.x86_64                        Upgraded qt-common-1:4.8.7-36.fc28.noarch                Upgrade            1:4.8.7-40.fc28.noarch              Upgraded qt-x11-1:4.8.7-36.fc28.x86_64                Upgrade         1:4.8.7-40.fc28.x86_64               Upgraded sddm-breeze-5.12.5-1.fc28.noarch                         Upgrade              5.12.5-3.fc28.noarch                        Upgraded selinux-policy-3.14.1-24.fc28.noarch                   Upgrade                 3.14.1-25.fc28.noarch                  Upgraded selinux-policy-targeted-3.14.1-24.fc28.noarch        Upgrade                          3.14.1-25.fc28.noarch            Upgraded sssd-1.16.1-4.fc28.x86_64                               Upgrade       1.16.1-8.fc28.x86_64                              Upgraded sssd-ad-1.16.1-4.fc28.x86_64                          Upgrade          1.16.1-8.fc28.x86_64                         Upgraded sssd-client-1.16.1-4.fc28.x86_64                    Upgrade              1.16.1-8.fc28.x86_64                   Upgraded sssd-common-1.16.1-4.fc28.x86_64                  Upgrade              1.16.1-8.fc28.x86_64                 Upgraded sssd-common-pac-1.16.1-4.fc28.x86_64            Upgrade                  1.16.1-8.fc28.x86_64           Upgraded sssd-dbus-1.16.1-4.fc28.x86_64                Upgrade            1.16.1-8.fc28.x86_64               Upgraded sssd-ipa-1.16.1-4.fc28.x86_64               Upgrade           1.16.1-8.fc28.x86_64              Upgraded sssd-kcm-1.16.1-4.fc28.x86_64             Upgrade           1.16.1-8.fc28.x86_64                     Upgraded sssd-krb5-1.16.1-4.fc28.x86_64                   Upgrade            1.16.1-8.fc28.x86_64                  Upgraded sssd-krb5-common-1.16.1-4.fc28.x86_64          Upgrade                   1.16.1-8.fc28.x86_64         Upgraded sssd-ldap-1.16.1-4.fc28.x86_64               Upgrade            1.16.1-8.fc28.x86_64              Upgraded sssd-nfs-idmap-1.16.1-4.fc28.x86_64        Upgrade                 1.16.1-8.fc28.x86_64       Upgraded sssd-proxy-1.16.1-4.fc28.x86_64          Upgrade             1.16.1-8.fc28.x86_64         Upgraded sssd-tools-1.16.1-4.fc28.x86_64               Upgrade             1.16.1-8.fc28.x86_64              Upgraded volume_key-libs-0.3.9-19.fc28.x86_64        Upgrade                  0.3.10-1.fc28.x86_64       Upgraded vte-profile-0.52.1-1.fc28.x86_64          Upgrade              0.52.2-1.fc28.x86_64         Upgraded vte291-0.52.1-1.fc28.x86_64 -- Conjecture is just a conclusion based on incomplete information. It isn't a fact.