[LightDM] Can not active screen after second time lock screen.

Tue Apr 12 05:56:03 UTC 2016

what I have done:
1. login system
2. lock screen with command 'dm-tool lock'
3. active screen, enter password, login system again
4. lock screen again with command 'dm-tool lock'
what happend:
screen remains blank, can not active screen.this happens everytime if I 
take actions described above.

I'm using Archlinx + lightdm + lightdm-gtk-greeter, laptop X1 carbon 
2015 edition.

there is a failure in /var/log/lightdm/x-0.log :
[root at XSign lightdm]# cat x-0.log

X.Org X Server 1.18.3
Release Date: 2016-04-04
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.2.5-1-ARCH x86_64
Current Operating System: Linux XSign 4.4.5-1-ARCH #1 SMP PREEMPT Thu 
Mar 10 07:38:19 CET 2016 x86_64
Kernel command line: initrd=\initramfs-linux.img root=/dev/sda3 rw
Build Date: 05 April 2016  05:24:02PM

Current version of pixman: 0.34.0
     Before reporting problems, check http://wiki.x.org
     to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
     (++) from command line, (!!) notice, (II) informational,
     (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Apr 12 13:45:41 2016
(==) Using config directory: "/etc/X11/xorg.conf.d"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
xf86: remove device 0 /sys/devices/pci0000:00/0000:00:02.0/drm/card0
failed to find screen to remove
(II) AIGLX: Suspending AIGLX clients for VT switch

below is my lightdm.conf:
[root at XSign lightdm]# cat /etc/lightdm/lightdm.conf
#
# General configuration
#
# start-default-seat = True to always start one seat if none are defined 
in the configuration
# greeter-user = User to run greeter as
# minimum-display-number = Minimum display number to use for X servers
# minimum-vt = First VT to run displays on
# lock-memory = True to prevent memory from being paged to disk
# user-authority-in-system-dir = True if session authority should be in 
the system location
# guest-account-script = Script to be run to setup guest account
# logind-check-graphical = True to on start seats that are marked as 
graphical by logind
# log-directory = Directory to log information to
# run-directory = Directory to put running state in
# cache-directory = Directory to cache to
# sessions-directory = Directory to find sessions
# remote-sessions-directory = Directory to find remote sessions
# greeters-directory = Directory to find greeters
# backup-logs = True to move add a .old suffix to old log files when 
opening new ones
#
[LightDM]
#start-default-seat=true
#greeter-user=lightdm
#minimum-display-number=0
#minimum-vt=7 # Setting this to a value < 7 implies security issues, see 
FS#46799
#lock-memory=true
#user-authority-in-system-dir=false
#guest-account-script=guest-account
#logind-check-graphical=false
#log-directory=/var/log/lightdm
run-directory=/run/lightdm
#cache-directory=/var/cache/lightdm
#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions:/usr/share/wayland-sessions
#remote-sessions-directory=/usr/share/lightdm/remote-sessions
#greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters
#backup-logs=true

#
# Seat configuration
#
# Seat configuration is matched against the seat name glob in the 
section, for example:
# [Seat:*] matches all seats and is applied first.
# [Seat:seat0] matches the seat named "seat0".
# [Seat:seat-thin-client*] matches all seats that have names that start 
with "seat-thin-client".
#
# type = Seat type (xlocal, xremote, unity)
# pam-service = PAM service to use for login
# pam-autologin-service = PAM service to use for autologin
# pam-greeter-service = PAM service to use for greeters
# xserver-command = X server command to run (can also contain arguments 
e.g. X -special-option)
# xmir-command = Xmir server command to run (can also contain arguments 
e.g. Xmir -special-option)
# xserver-config = Config file to pass to X server
# xserver-layout = Layout to pass to X server
# xserver-allow-tcp = True if TCP/IP connections are allowed to this X 
server
# xserver-share = True if the X server is shared for both greeter and 
session
# xserver-hostname = Hostname of X server (only for type=xremote)
# xserver-display-number = Display number of X server (only for 
type=xremote)
# xdmcp-manager = XDMCP manager to connect to (implies 
xserver-allow-tcp=true)
# xdmcp-port = XDMCP UDP/IP port to communicate on
# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored 
in keys.conf)
# unity-compositor-command = Unity compositor command to run (can also 
contain arguments e.g. unity-system-compositor -special-option)
# unity-compositor-timeout = Number of seconds to wait for compositor to 
start
# greeter-session = Session to load for greeter
# greeter-hide-users = True to hide the user list
# greeter-allow-guest = True if the greeter should show a guest login option
# greeter-show-manual-login = True if the greeter should offer a manual 
login option
# greeter-show-remote-login = True if the greeter should offer a remote 
login option
# user-session = Session to load for users
# allow-user-switching = True if allowed to switch users
# allow-guest = True if guest login is allowed
# guest-session = Session to load for guests (overrides user-session)
# session-wrapper = Wrapper script to run session with
# greeter-wrapper = Wrapper script to run greeter with
# guest-wrapper = Wrapper script to run guest sessions with
# display-setup-script = Script to run when starting a greeter session 
(runs as root)
# display-stopped-script = Script to run after stopping the display 
server (runs as root)
# greeter-setup-script = Script to run when starting a greeter (runs as 
root)
# session-setup-script = Script to run when starting a user session 
(runs as root)
# session-cleanup-script = Script to run when quitting a user session 
(runs as root)
# autologin-guest = True to log in as guest by default
# autologin-user = User to log in with by default (overrides 
autologin-guest)
# autologin-user-timeout = Number of seconds to wait before loading 
default user
# autologin-session = Session to load for automatic login (overrides 
user-session)
# autologin-in-background = True if autologin session should not be 
immediately activated
# exit-on-failure = True if the daemon should exit if this seat fails
#
[Seat:*]
#type=xlocal
#pam-service=lightdm
#pam-autologin-service=lightdm-autologin
#pam-greeter-service=lightdm-greeter
#xserver-command=X
#xmir-command=Xmir
#xserver-config=
#xserver-layout=
#xserver-allow-tcp=false
#xserver-share=true
#xserver-hostname=
#xserver-display-number=
#xdmcp-manager=
#xdmcp-port=177
#xdmcp-key=
#unity-compositor-command=unity-system-compositor
#unity-compositor-timeout=60
#greeter-session=example-gtk-gnome
#greeter-hide-users=false
#greeter-allow-guest=true
#greeter-show-manual-login=false
#greeter-show-remote-login=true
#user-session=default
#allow-user-switching=true
#allow-guest=true
#guest-session=
session-wrapper=/etc/lightdm/Xsession
#greeter-wrapper=
#guest-wrapper=
#display-setup-script=
#display-stopped-script=
#greeter-setup-script=
#session-setup-script=
#session-cleanup-script=
#autologin-guest=false
#autologin-user=
#autologin-user-timeout=0
#autologin-in-background=false
#autologin-session=
exit-on-failure=true

#
# XDMCP Server configuration
#
# enabled = True if XDMCP connections should be allowed
# port = UDP/IP port to listen for connections on
# listen-address = Host/address to listen for XDMCP connections (use all 
addresses if not present)
# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to 
not use authentication (stored in keys.conf)
#
# The authentication key is a 56 bit DES key specified in hex as 
0xnnnnnnnnnnnnnn.  Alternatively
# it can be a word and the first 7 characters are used as the key.
#
[XDMCPServer]
#enabled=false
#port=177
#listen-address=
#key=

#
# VNC Server configuration
#
# enabled = True if VNC connections should be allowed
# command = Command to run Xvnc server with
# port = TCP/IP port to listen for connections on
# listen-address = Host/address to listen for VNC connections (use all 
addresses if not present)
# width = Width of display to use
# height = Height of display to use
# depth = Color depth of display to use
#
[VNCServer]
#enabled=false
#command=Xvnc
#port=5900
#listen-address=
#width=1024
#height=768
#depth=8

and my lightdm-gtk-greeter.conf:
[root at XSign lightdm]# cat /etc/lightdm/lightdm-gtk-greeter.conf
[greeter]
background = /etc/lightdm/background.jpg
user-background = false
theme-name = TraditionalOk
icon-theme-name = ultra-flat-icons
font-name = 思源黑体 CN Semi-Light 10
clock-format = %Y-%m-%d %H:%M
xft-dpi = 96
xft-antialias = true

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