Marco, I can reproduce that with 100% reliability on my 16.04 beta (with all the updates installed). When I see the auth dialog (i.e. after locking the screen or returning from sleep), I hit ctrl+alt+F6 ctrl+alt+F7 and gain access to my system. During the process, nothing at all gets added to /var/log/auth.log
Marco, I can reproduce that with 100% reliability on my 16.04 beta (with all the updates installed). When I see the auth dialog (i.e. after locking the screen or returning from sleep), I hit ctrl+alt+F6 ctrl+alt+F7 and gain access to my system. During the process, nothing at all gets added to /var/log/auth.log
user@host:~$ gdbus monitor --system --dest org.freedesktop .login1 & gdbus monitor --session --dest com.canonical.Unity .login1 .login1 is owned by :1.4 p/login1/ session/ c2: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Session' , {'IdleHint': <true>, 'IdleSinceHint': <uint64 1459227675096697>, 'IdleSinceHintM onotonic' : <uint64 11646057942>}, @as []) p/login1/ seat/seat0: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Seat', {'IdleHint': <true>, 'IdleSinceHint': <uint64 1459227675096697>, 'IdleSinceHintM onotonic' : <uint64 11646057942>}, @as []) p/login1/ user/_1000: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. User', {'IdleHint': <true>, 'IdleSinceHint': <uint64 1459227675096697>, 'IdleSinceHintM onotonic' : <uint64 11646057942>}, @as []) p/login1: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Manager' , {'IdleHint': <true>, 'IdleSinceHint': <uint64 1459227675096697>, 'IdleSinceHintM onotonic' : <uint64 11646057942>}, @as []) p/login1/ session/ c2: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Session' , {'Active': <false>}, @as []) p/login1/ seat/seat0: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Seat', {'ActiveSession': <('', objectpath '/')>}, @as []) p/login1/ session/ c2: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Session' , {'Active': <true>}, @as []) p/login1/ seat/seat0: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Seat', {'ActiveSession': <('c2', objectpath '/org/freedeskt op/login1/ session/ c2')>}, @as []) p/login1/ session/ c2: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Session' , {'IdleHint': <false>, 'IdleSinceHint': <uint64 1459227691145076>, 'IdleSinceHintM onotonic' : <uint64 11662106321>}, @as []) p/login1/ seat/seat0: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Seat', {'IdleHint': <false>, 'IdleSinceHint': <uint64 1459227691145076>, 'IdleSinceHintM onotonic' : <uint64 11662106321>}, @as []) p/login1/ user/_1000: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. User', {'IdleHint': <false>, 'IdleSinceHint': <uint64 1459227691145076>, 'IdleSinceHintM onotonic' : <uint64 11662106321>}, @as []) p/login1: org.freedesktop .DBus.Propertie s.PropertiesCha nged ('org.freedeskt op.login1. Manager' , {'IdleHint': <false>, 'IdleSinceHint': <uint64 1459227691145076>, 'IdleSinceHintM onotonic' : <uint64 11662106321>}, @as [])
[1] 26646
Monitoring signals from all objects owned by org.freedesktop
The name org.freedesktop
Monitoring signals from all objects owned by com.canonical.Unity
The name com.canonical.Unity is owned by :1.14
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
/org/freedeskto
^C
user@host:~$