https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=874201
Yesterday I was investigating an issue that might be related and I just filed the above bug report. Please investigate whether that might be the cause. # ps axZ|grep sddm system_u:system_r:xdm_t:s0-s0:c0.c1023 963 ? Ssl 0:00 /usr/bin/sddm Run "ps axZ|grep gdm3" to see the context, the output should be something like the above if all goes well (xdm_t is the relevant part). # ls -lZ /usr/bin/sddm -rwxr-xr-x. 1 root root system_u:object_r:xdm_exec_t:s0 475968 Mar 14 19:50 / usr/bin/sddm Also run "ls -lZ" on the binary to see if it has the right context, the output should be something like the above, xdm_exec_t is the relevant part. If those checks pass then run the systemctl command suggested in #874201 and restart gdm3 to see if it gets the right context. PS I gave up on gdm3 last time due to some other issues. Is there a gdm3 specific feature you really need? If you want to improve Debian then debugging this is a good thing to do, if you just want a working system then sddm might be a better choice. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/