VT switching - disabled acceleration, works

/var/log/Xorg.0.log
Kernel command line: ... nouveau.noaccel=1
(EE) NOUVEAU(0): Error initialising acceleration.  Falling back to NoAccel
(**) NOUVEAU(0): [COPY] acceleration disabled

glxinfo:
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.8, 128 bits)

~~~~~~~~~~~~~~~~~~~~~~~

$ lightdm --show-config 
   [LightDM]
A  minimum-vt=1
A  user-authority-in-system-dir=true

   [Seat:*]
A  greeter-session=lightdm-greeter
A  user-session=xfce
A  session-wrapper=/etc/X11/xinit/Xsession
A  display-setup-script=/usr/bin/XRandR
A  autologin-user=liveuser
A  autologin-user-timeout=20

Sources:
A  /etc/lightdm/lightdm.conf

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.19.2, UID=0 PID=1594
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Registered seat module unity
[+0.00s] DEBUG: Monitoring logind for seats
[+0.00s] DEBUG: New seat added from logind: seat0
[+0.00s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.00s] DEBUG: Seat seat0: Starting
[+0.00s] DEBUG: Seat seat0: Creating greeter session
[+0.01s] DEBUG: Seat seat0: Creating display server of type x
[+0.01s] DEBUG: Using VT 1
[+0.01s] DEBUG: Seat seat0: Starting local X display on VT 1
[+0.01s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.01s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/root/:0
[+0.01s] DEBUG: XServer 0: Launching X Server
[+0.01s] DEBUG: Launching process 1600: /usr/bin/X :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt1 -novtswitch
[+0.01s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.03s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.03s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+2.74s] DEBUG: Got signal 10 from process 1600
[+2.74s] DEBUG: XServer 0: Got signal from X server :0
[+2.74s] DEBUG: XServer 0: Connecting to XServer :0
[+2.74s] DEBUG: Launching process 1610: /usr/bin/XRandR
[+2.79s] DEBUG: Process 1610 exited with return value 0
[+2.79s] DEBUG: Seat seat0: Exit status of /usr/bin/XRandR: 0
[+2.79s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+2.79s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+2.79s] DEBUG: Session pid=1615: Started with service 'lightdm-greeter', username 'lightdm'
[+2.81s] DEBUG: Session pid=1615: Authentication complete with return value 0: Success
[+2.81s] DEBUG: Seat seat0: Session authenticated, running command
[+2.81s] DEBUG: Session pid=1615: Running command /usr/sbin/lightdm-gtk-greeter
[+2.81s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+2.81s] DEBUG: Session pid=1615: Logging to /var/log/lightdm/seat0-greeter.log
[+2.90s] DEBUG: Activating VT 1
[+2.90s] DEBUG: Activating login1 session c1
[+2.90s] DEBUG: Seat seat0 changes active session to c1
[+2.90s] DEBUG: Session c1 is already active
[+4.57s] DEBUG: Greeter connected version=1.19.2 resettable=false
[+6.23s] DEBUG: Greeter start authentication for liveuser
[+6.23s] DEBUG: Session pid=1694: Started with service 'lightdm-autologin', username 'liveuser'
[+6.27s] DEBUG: Session pid=1694: Authentication complete with return value 0: Success
[+6.27s] DEBUG: Authenticate result for user liveuser: Success
[+6.27s] DEBUG: User liveuser authorized
[+24.57s] DEBUG: Greeter sets language en_US.utf8
[+24.58s] DEBUG: Writing /home/liveuser/.dmrc
[+24.66s] DEBUG: Greeter requests session xfce
[+24.67s] DEBUG: Writing /home/liveuser/.dmrc
[+24.67s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used for user session
[+24.67s] DEBUG: Session pid=1615: Sending SIGTERM
[+24.73s] DEBUG: Greeter closed communication channel
[+24.73s] DEBUG: Session pid=1615: Exited with return value 0
[+24.73s] DEBUG: Seat seat0: Session stopped
[+24.73s] DEBUG: Seat seat0: Greeter stopped, running session
[+24.73s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
[+24.73s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+24.73s] DEBUG: Session pid=1694: Running command /etc/X11/xinit/Xsession startxfce4
[+24.73s] DEBUG: Creating shared data directory /var/lib/lightdm-data/liveuser
[+24.73s] DEBUG: Session pid=1694: Logging to .xsession-errors
[+24.85s] DEBUG: Activating VT 1
[+24.85s] DEBUG: Activating login1 session 2
[+24.85s] DEBUG: Seat seat0 changes active session to 
[+24.85s] DEBUG: Seat seat0 changes active session to 2
[+24.85s] DEBUG: Session 2 is already active
[+41.39s] DEBUG: Seat seat0: Creating greeter session
[+41.39s] DEBUG: Seat seat0: Creating display server of type x
[+41.39s] DEBUG: Using VT 2
[+41.39s] DEBUG: Seat seat0: Starting local X display on VT 2
[+41.39s] DEBUG: XServer 1: Logging to /var/log/lightdm/x-1.log
[+41.39s] DEBUG: XServer 1: Writing X server authority to /var/run/lightdm/root/:1
[+41.39s] DEBUG: XServer 1: Launching X Server
[+41.39s] DEBUG: Launching process 2046: /usr/bin/X :1 -seat seat0 -auth /var/run/lightdm/root/:1 -nolisten tcp vt2 -novtswitch
[+41.39s] DEBUG: XServer 1: Waiting for ready signal from X server :1
[+41.47s] DEBUG: Seat seat0 changes active session to 
[+41.81s] DEBUG: Got signal 10 from process 2046
[+41.81s] DEBUG: XServer 1: Got signal from X server :1
[+41.81s] DEBUG: XServer 1: Connecting to XServer :1
[+41.81s] DEBUG: Launching process 2053: /usr/bin/XRandR
[+41.82s] DEBUG: Process 2053 exited with return value 0
[+41.82s] DEBUG: Seat seat0: Exit status of /usr/bin/XRandR: 0
[+41.82s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+41.82s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+41.82s] DEBUG: Session pid=2058: Started with service 'lightdm-greeter', username 'lightdm'
[+41.83s] DEBUG: Session pid=2058: Authentication complete with return value 0: Success
[+41.83s] DEBUG: Seat seat0: Session authenticated, running command
[+41.83s] DEBUG: Session pid=2058: Running command /usr/sbin/lightdm-gtk-greeter
[+41.83s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+41.83s] DEBUG: Session pid=2058: Logging to /var/log/lightdm/seat0-greeter.log
[+41.92s] DEBUG: Activating VT 2
[+41.92s] DEBUG: Locking login1 session 2
[+41.92s] DEBUG: Activating login1 session c2
[+41.92s] DEBUG: Seat seat0 changes active session to c2
[+41.92s] DEBUG: Session c2 is already active
[+42.04s] DEBUG: Greeter connected version=1.19.2 resettable=false
[+42.44s] DEBUG: Greeter start authentication for liveuser
[+42.44s] DEBUG: Seat seat0: Failed to work out session ID to mark
[+42.44s] DEBUG: Session pid=2094: Started with service 'lightdm-autologin', username 'liveuser'
[+42.45s] DEBUG: Session pid=2094: Authentication complete with return value 0: Success
[+42.45s] DEBUG: Authenticate result for user liveuser: Success
[+42.45s] DEBUG: User liveuser authorized
[+62.04s] DEBUG: Greeter sets language en_US.utf8
[+62.13s] DEBUG: Greeter requests session xfce
[+62.13s] DEBUG: Seat seat0: Returning to existing user session liveuser
[+62.13s] DEBUG: Unlocking login1 session 2
[+62.13s] DEBUG: Activating VT 1
[+62.14s] WARNING: Error using VT_WAITACTIVE 1 on /dev/tty0: Interrupted system call
[+62.14s] DEBUG: Seat seat0: Stopping greeter
[+62.14s] DEBUG: Session pid=2058: Sending SIGTERM
[+62.14s] DEBUG: Activating login1 session 2
[+62.14s] DEBUG: Session pid=2094: Exited with return value 0
[+62.14s] DEBUG: Seat seat0: Session stopped
[+62.21s] DEBUG: Seat seat0 changes active session to 2
[+62.21s] DEBUG: Session 2 is already active
[+62.21s] DEBUG: Greeter closed communication channel
[+62.21s] DEBUG: Session pid=2058: Exited with return value 0
[+62.21s] DEBUG: Seat seat0: Session stopped
[+62.21s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+62.21s] DEBUG: Sending signal 15 to process 2046
[+62.28s] DEBUG: Process 2046 exited with return value 0
[+62.28s] DEBUG: XServer 1: X server stopped
[+62.28s] DEBUG: Releasing VT 2
[+62.28s] DEBUG: XServer 1: Removing X server authority /var/run/lightdm/root/:1
[+62.28s] DEBUG: Seat seat0: Display server stopped
[+69.99s] DEBUG: Session pid=1694: Exited with return value 0
[+69.99s] DEBUG: Seat seat0: Session stopped
[+69.99s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+69.99s] DEBUG: Sending signal 15 to process 1600
[+70.20s] DEBUG: Process 1600 exited with return value 0
[+70.20s] DEBUG: XServer 0: X server stopped
[+70.20s] DEBUG: Releasing VT 1
[+70.20s] DEBUG: XServer 0: Removing X server authority /var/run/lightdm/root/:0
[+70.20s] DEBUG: Seat seat0: Display server stopped
[+70.20s] DEBUG: Seat seat0: Active display server stopped, starting greeter
[+70.20s] DEBUG: Seat seat0: Creating greeter session
[+70.20s] DEBUG: Seat seat0: Creating display server of type x
[+70.20s] DEBUG: Using VT 1
[+70.20s] DEBUG: Seat seat0: Starting local X display on VT 1
[+70.20s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+70.20s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/root/:0
[+70.20s] DEBUG: XServer 0: Launching X Server
[+70.20s] DEBUG: Launching process 2137: /usr/bin/X :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt1 -novtswitch
[+70.20s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+70.53s] DEBUG: Got signal 10 from process 2137
[+70.53s] DEBUG: XServer 0: Got signal from X server :0
[+70.53s] DEBUG: XServer 0: Connecting to XServer :0
[+70.53s] DEBUG: Launching process 2144: /usr/bin/XRandR
[+70.54s] DEBUG: Process 2144 exited with return value 0
[+70.54s] DEBUG: Seat seat0: Exit status of /usr/bin/XRandR: 0
[+70.54s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+70.54s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+70.54s] DEBUG: Session pid=2149: Started with service 'lightdm-greeter', username 'lightdm'
[+70.55s] DEBUG: Session pid=2149: Authentication complete with return value 0: Success
[+70.55s] DEBUG: Seat seat0: Session authenticated, running command
[+70.55s] DEBUG: Session pid=2149: Running command /usr/sbin/lightdm-gtk-greeter
[+70.55s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+70.55s] DEBUG: Session pid=2149: Logging to /var/log/lightdm/seat0-greeter.log
[+70.64s] DEBUG: Activating VT 1
[+70.64s] DEBUG: Activating login1 session c3
[+70.64s] DEBUG: Seat seat0 changes active session to c3
[+70.64s] DEBUG: Session c3 is already active
[+70.76s] DEBUG: Greeter connected version=1.19.2 resettable=false
[+71.13s] DEBUG: Greeter start authentication for liveuser
[+71.13s] DEBUG: Session pid=2186: Started with service 'lightdm-autologin', username 'liveuser'
[+71.15s] DEBUG: Session pid=2186: Authentication complete with return value 0: Success
[+71.15s] DEBUG: Authenticate result for user liveuser: Success
[+71.15s] DEBUG: User liveuser authorized
[+90.76s] DEBUG: Greeter sets language en_US.utf8
[+90.84s] DEBUG: Greeter requests session xfce
[+90.84s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used for user session
[+90.84s] DEBUG: Session pid=2149: Sending SIGTERM
[+90.86s] DEBUG: Greeter closed communication channel
[+90.86s] DEBUG: Session pid=2149: Exited with return value 0
[+90.86s] DEBUG: Seat seat0: Session stopped
[+90.86s] DEBUG: Seat seat0: Greeter stopped, running session
[+90.86s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session1
[+90.86s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+90.86s] DEBUG: Session pid=2186: Running command /etc/X11/xinit/Xsession startxfce4
[+90.86s] DEBUG: Creating shared data directory /var/lib/lightdm-data/liveuser
[+90.86s] DEBUG: Session pid=2186: Logging to .xsession-errors
[+90.89s] DEBUG: Activating VT 1
[+90.89s] DEBUG: Activating login1 session 3
[+90.89s] DEBUG: Seat seat0 changes active session to 
[+90.89s] DEBUG: Seat seat0 changes active session to 3
[+90.89s] DEBUG: Session 3 is already active