Ubuntu crashes and automatically logout

[Mikael Andersson]

lsb_release -rd:
Description: Ubuntu 10.04 LTS
Release: 10.04

Ubuntu crashes, the screen gets black, the mouse pointer is visible but cannot be moved, after a few seconds the system is logged out and the login prompt appears.

I upgraded from 9.x to 10.04 a couple of days ago. The problem occurred soon after the upgrade.

When the problem happened, I was running:

Firefox
Shell
Revelation 0.4.11
Nautilus
Evolution

I also had an active 3G connection to my mobile phone via a USB cable.

The problem happens several times a day; at least five times during a normal working day.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: firefox 3.6.3+nobinonly-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
Architecture: i386
Date: Tue May 18 13:20:41 2010
FirefoxPackages:
 firefox 3.6.3+nobinonly-0ubuntu4
 firefox-gnome-support 3.6.3+nobinonly-0ubuntu4
 firefox-branding 3.6.3+nobinonly-0ubuntu4
 abroswer N/A
 abrowser-branding N/A
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: firefox

[Mikael Andersson (mikael-develog)]

Do not have a clue if these print outs from the syslog are valuable:

May 18 13:36:32 develog-laptop gnome-session[16910]: WARNING: Detected that screensaver has left the bus
May 18 13:36:32 develog-laptop NetworkManager: <info> (ttyACM0): device state change: 8 -> 3 (reason 38)
May 18 13:36:32 develog-laptop NetworkManager: <info> (ttyACM0): deactivating device (reason: 38).
May 18 13:36:32 develog-laptop NetworkManager: <WARN> check_one_route(): (ppp0) error -34 returned from rtnl_route_del(): Sucess#012
May 18 13:36:32 develog-laptop pppd[17412]: Terminating on signal 15
May 18 13:36:32 develog-laptop pppd[17412]: Connect time 30.2 minutes.
May 18 13:36:32 develog-laptop pppd[17412]: Sent 20655839 bytes, received 8497139 bytes.
May 18 13:36:32 develog-laptop pppd[17412]: Connection terminated.
May 18 13:36:33 develog-laptop modem-manager: (ttyACM0) closing serial device...
May 18 13:36:33 develog-laptop NetworkManager: <WARN> sync_addresses(): (ppp0) error -19 returned from rtnl_addr_delete(): Sucess#012
May 18 13:36:33 develog-laptop pppd[17412]: Exit.
May 18 13:36:33 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): now unmanaged
May 18 13:36:33 develog-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/1: state changed (connected -> disconnecting)
May 18 13:36:33 develog-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/1: state changed (disconnecting -> connected)
May 18 13:36:33 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): device state change: 3 -> 1 (reason 36)
May 18 13:36:33 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): cleaning up...
May 18 13:36:33 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): taking down device.
May 18 13:36:33 develog-laptop NetworkManager: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
May 18 13:36:34 develog-laptop pulseaudio[17862]: pid.c: Stale PID file, overwriting.
May 18 13:36:34 develog-laptop pulseaudio[17862]: bluetooth-util.c: Error from ListAdapters reply: org.freedesktop.DBus.Error.AccessDenied
May 18 13:36:34 develog-laptop gdm-simple-slave[17877]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
May 18 13:36:34 develog-laptop pulseaudio[17862]: main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-ZWoQbTtu3S: Connection refused
May 18 13:36:34 develog-laptop pulseaudio[17885]: pid.c: Daemon already running.
May 18 13:36:34 develog-laptop pulseaudio[17889]: pid.c: Daemon already running.
May 18 13:36:35 develog-laptop NetworkManager: <debug> [1274182594.999688] ensure_killed(): waiting for ppp pid 17412 to exit
May 18 13:36:35 develog-laptop NetworkManager: <debug> [1274182594.999892] ensure_killed(): ppp pid 17412 cleaned up
May 18 13:36:35 develog-laptop acpid: client 16824[0:0] has disconnected
May 18 13:36:35 develog-laptop acpid: client connected from 17886[0:0]
May 18 13:36:35 develog-laptop acpid: 1 client rule loaded
May 18 13:36:38 develog-laptop bonobo-activation-server (mikael-17921): could not associate with desktop session: Failed to connect to socket /tmp/dbus-ZWoQbTtu3S: Con...

[Mikael Andersson (mikael-develog)]

I accidentally added this bug report to the firefox package. It is probably related to something in Gnome. Can anyone move it to a more appropriate package?

[Mikael Andersson (mikael-develog)]

I am adding some more information that I think can be useful.

lspci gives:

00:00.0 Host bridge: Intel Corporation 82855PM Processor to I/O Controller (rev 03)
00:01.0 PCI bridge: Intel Corporation 82855PM Processor to AGP Controller (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corporation 82801DBM (ICH4-M) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 01)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
00:1f.6 Modem: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Modem Controller (rev 01)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] (rev 02)
02:00.0 CardBus bridge: Texas Instruments PCI4520 PC card Cardbus Controller (rev 01)
02:00.2 FireWire (IEEE 1394): Texas Instruments Device 802a (rev 01)
02:01.0 Ethernet controller: Intel Corporation 82540EP Gigabit Ethernet Controller (Mobile) (rev 03)
02:02.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05)

lsmod:

Module Size Used by
ppp_deflate 3682 0
zlib_deflate 19568 1 ppp_deflate
bsd_comp 4811 0
ppp_async 6734 1
isofs 29250 0
udf 78785 0
crc_itu_t 1371 1 udf
cdc_acm 13694 3
hidp 11083 0
rfcomm 33421 4
binfmt_misc 6587 1
sco 7885 2
bridge 45582 0
stp 1655 1 bridge
bnep 9436 2
l2cap 30624 17 hidp,rfcomm,bnep
snd_intel8x0 25588 2
snd_ac97_codec 100646 1 snd_intel8x0
ac97_bus 1002 1 snd_ac97_codec
snd_pcm_oss 35308 0
snd_mixer_oss 13746 1 snd_pcm_oss
snd_pcm 70662 3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
fbcon 35102 72
tileblit 2031 1 fbcon
font 7557 1 fbcon
bitblit 4707 1 fbcon
softcursor 1189 1 bitblit
snd_seq_dummy 1338 0
vga16fb 11385 0
vgastate 8961 1 vga16fb
pcmcia 33024 0
snd_seq_oss 26726 0
joydev 8708 0
snd_seq_midi 4557 0
snd_rawmidi 19056 1 snd_seq_midi
snd_seq_midi_event 6003 2 snd_seq_oss,snd_seq_midi
snd_seq 47263 7 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_e...

[Dr. Kenobi (drkenobi)]

I don't know which package is related to this bug. This is also happening to me. I didn't found a duplicate.

[Mikael Andersson (mikael-develog)]

May be related to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/573957

[Dr. Kenobi (drkenobi)]

@Philippe Gauthier, is this a duplicate of the bug @Mikael Andersson posted in #6?

[Mikael Andersson (mikael-develog)]

Since the first row in the syslog implied a problem with the screensaver (see below row), I made a test.
May 18 13:36:32 develog-laptop gnome-session[16910]: WARNING: Detected that screensaver has left the bus

In the Screensaver Preferences, I deselected:
- Active screensaver when computer is idle
- Lock screen when screensaver is active

I have not had a crash at all since I made this change. Since I have only been running less than a day without any problems, I will write a comment again tomorrow. This is of course not a permanent fix of the problem but gives some information of what can be wrong.

[Prophet (peter-vanb)]

I think this bug also affects me, but from my logs I find something else. I'm not sure if this is the same bug.

auth.log

gnome-keyring-daemon[2480]: dbus failure unregistering from session: Connection is closed
gnome-keyring-daemon[2480]: dbus failure unregistering from session: Connection is closed
polkitd(authority=local): Unregistered Authentication Agent for session /org/freedesktop/ConsoleKit/Session2 (system bus name :1.31, object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.utf8) (disconnected from bus)
login[31731]: pam_unix(login:auth): auth could not identify password for [[9!'([9!PKMQPM:.1:01[9 1***S6**]
login[31731]: pam_winbind(login:auth): getting password (0x00000388)
login[31731]: pam_winbind(login:auth): could not recover authentication token
login[31731]: pam_winbind(login:auth): Could not retrieve user's password
gdm-session-worker[2336]: pam_unix(gdm:session): session closed for user <username>
dbus-daemon: Rejected send message, 2 matched rules; type="method_call", sender=":1.66" (uid=1000 pid=4633 comm="/usr/bin/pulseaudio) interface="org.bluez.Manager" member="ListAdapters" error name="(unset)" requested_reply=0 destination="org.bluez" (uid=0 pid=1128 comm="/usr/sbin/bluetoothd))
login[31731]: FAILED LOGIN (1) on '/dev/tty2' FOR 'UNKNOWN', Authentication failure
login[31731]: pam_securetty(login:auth): unexpected response from failed conversation function
login[31731]: pam_securetty(login:auth): cannot determine username
login[31731]: pam_nologin(login:auth): cannot determine username
login[31731]: FAILED LOGIN (2) on '/dev/tty2' FOR 'UNKNOWN', Error in service module
login[31731]: pam_securetty(login:auth): unexpected response from failed conversation function
login[31731]: pam_securetty(login:auth): cannot determine username
login[31731]: pam_nologin(login:auth): cannot determine username
login[31731]: FAILED LOGIN (3) on '/dev/tty2' FOR 'UNKNOWN', Error in service module
login[31731]: pam_securetty(login:auth): unexpected response from failed conversation function
login[31731]: pam_securetty(login:auth): cannot determine username
login[31731]: pam_nologin(login:auth): cannot determine username
login[31731]: FAILED LOGIN (4) on '/dev/tty2' FOR 'UNKNOWN', Error in service module
login[31731]: pam_securetty(login:auth): unexpected response from failed conversation function
login[31731]: pam_securetty(login:auth): cannot determine username
login[31731]: pam_nologin(login:auth): cannot determine username
login[31731]: FAILED LOGIN (5) on '/dev/tty2' FOR 'UNKNOWN', Error in service module
login[31731]: TOO MANY LOGIN TRIES (5) on '/dev/tty2' FOR 'UNKNOWN'
login[31731]: pam_mail(login:session): cannot determine username
login[31731]: pam_unix(login:session): close_session - error recovering username
login[31731]: Error getting passwd info for user [(null)]; rc = [19]

[Prophet (peter-vanb)]

I forgot to mention, but obviously I didn't do anything on TTY2

[Douglas Bagnall (douglasbagnall)]

Prophet:
Have a look at https://bugs.launchpad.net/ubuntu/+bug/511774
That looks more like your problem.

[Mikael Andersson (mikael-develog)]

Just got a new crash. Below is an excerpt from the syslog. Any ideas how I can find more information that can be relevant to locate the problem?

May 20 14:38:07 develog-laptop NetworkManager: <info> (ttyACM1): device state change: 8 -> 3 (reason 38)
May 20 14:38:07 develog-laptop NetworkManager: <info> (ttyACM1): deactivating device (reason: 38).
May 20 14:38:07 develog-laptop NetworkManager: <WARN> check_one_route(): (ppp0) error -34 returned from rtnl_route_del(): Sucess#012
May 20 14:38:08 develog-laptop pppd[4732]: Terminating on signal 15
May 20 14:38:09 develog-laptop pppd[4732]: Connect time 75.1 minutes.
May 20 14:38:09 develog-laptop pppd[4732]: Sent 1470738 bytes, received 8274238 bytes.
May 20 14:38:11 develog-laptop pppd[4732]: Connection terminated.
May 20 14:38:12 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): now unmanaged
May 20 14:38:12 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): device state change: 3 -> 1 (reason 36)
May 20 14:38:12 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): cleaning up...
May 20 14:38:12 develog-laptop NetworkManager: <info> (00:1E:45:A6:62:20): taking down device.
May 20 14:38:13 develog-laptop NetworkManager: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
May 20 14:38:13 develog-laptop NetworkManager: <debug> [1274359093.630721] ensure_killed(): waiting for ppp pid 4732 to exit
May 20 14:38:13 develog-laptop NetworkManager: <debug> [1274359093.631145] ensure_killed(): ppp pid 4732 cleaned up
May 20 14:38:13 develog-laptop modem-manager: (ttyACM1) closing serial device...
May 20 14:38:13 develog-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/2: state changed (connected -> disconnecting)
May 20 14:38:13 develog-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/2: state changed (disconnecting -> connected)
May 20 14:38:17 develog-laptop pulseaudio[6770]: pid.c: Stale PID file, overwriting.
May 20 14:38:20 develog-laptop pulseaudio[6770]: bluetooth-util.c: Error from ListAdapters reply: org.freedesktop.DBus.Error.AccessDenied
May 20 14:38:20 develog-laptop gdm-simple-slave[6795]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
May 20 14:38:22 develog-laptop pulseaudio[6770]: main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-TIQ7DAUTrR: Connection refused
May 20 14:38:23 develog-laptop acpid: client connected from 6802[0:0]
May 20 14:38:23 develog-laptop acpid: 1 client rule loaded
May 20 14:38:23 develog-laptop bonobo-activation-server (mikael-6789): could not associate with desktop session: Failed to connect to socket /tmp/dbus-TIQ7DAUTrR: Connection refused
May 20 14:38:28 develog-laptop gdm-session-worker[6842]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
May 20 14:38:28 develog-laptop rtkit-daemon[1205]: Sucessfully made thread 6846 of process 6846 (n/a) owned by '112' high priority at nice level -11.
May 20 14:38:28 develog-laptop rtkit-daemon[1205]: Supervising 1 threads of 1 processes of 2 users.
May 20 14:38:28 develog-laptop rtkit-daemon[1205]: Sucessful...

[Dr. Kenobi (drkenobi)]

Mikael Andersson, in your last crash the "Active screensaver when computer is idle" & "Lock screen when screensaver is active" options in the Screensaver Preferences where selected or deselected.

[Mikael Andersson (mikael-develog)]

These two options are still deselected. It seems that the crash only occurs when I am using Firefox at a certain web site (idg.se). Yesterday I was able to reproduce the problem quickly, several times when I was surfing on this web site. Do not know if it could be that this web site is stressing my system more than other web sites have been using so far. Now I can see that something is printed on the screen a couple of seconds after the screen has gone black. Among other things, something about timidity was printed (see date and time: May 20 18:06:50 in the log below). Here follow a new excerpt. Anyone seeing anything suspicious? I should underline that the crash may not have occurred exactly during this excerpt. I will post a new and hopefully more precise log during the day.

May 20 18:06:44 develog-laptop bluetoothd[949]: Adapter /org/bluez/940/hci0 has been enabled
May 20 18:06:44 develog-laptop NetworkManager: <info> (ttyACM0): new GSM device (driver: 'cdc_acm')
May 20 18:06:44 develog-laptop NetworkManager: <info> (ttyACM0): exported as /org/freedesktop/NetworkManager/Devices/2
May 20 18:06:44 develog-laptop NetworkManager: <info> (ttyACM0): now managed
May 20 18:06:44 develog-laptop NetworkManager: <info> (ttyACM0): device state change: 1 -> 2 (reason 2)
May 20 18:06:44 develog-laptop NetworkManager: <info> (ttyACM0): deactivating device (reason: 2).
May 20 18:06:44 develog-laptop NetworkManager: <info> (ttyACM0): device state change: 2 -> 3 (reason 0)
May 20 18:06:45 develog-laptop /etc/mysql/debian-start[1067]: Upgrading MySQL tables if necessary.
May 20 18:06:45 develog-laptop /etc/mysql/debian-start[1070]: /usr/bin/mysql_upgrade: the '--basedir' option is always ignored
May 20 18:06:45 develog-laptop /etc/mysql/debian-start[1070]: Looking for 'mysql' as: /usr/bin/mysql
May 20 18:06:45 develog-laptop /etc/mysql/debian-start[1070]: Looking for 'mysqlcheck' as: /usr/bin/mysqlcheck
May 20 18:06:45 develog-laptop /etc/mysql/debian-start[1070]: This installation of MySQL is already upgraded to 5.1.41, use --force if you still need to run mysql_upgrade
May 20 18:06:45 develog-laptop /etc/mysql/debian-start[1077]: Checking for insecure root accounts.
May 20 18:06:46 develog-laptop /etc/mysql/debian-start[1081]: Triggering myisam-recover for all MyISAM tables
May 20 18:06:47 develog-laptop anacron[1150]: Anacron 2.3 started on 2010-05-20
May 20 18:06:47 develog-laptop anacron[1150]: Normal exit (0 jobs run)
May 20 18:06:49 develog-laptop init: plymouth-stop pre-start process (1200) terminated with status 1
May 20 18:06:50 develog-laptop pulseaudio[1202]: core-util.c: Home directory /etc/timidity not ours.
May 20 18:06:50 develog-laptop pulseaudio[1202]: lock-autospawn.c: Cannot access autospawn lock.
May 20 18:06:50 develog-laptop pulseaudio[1202]: main.c: Failed to acquire autospawn lock
May 20 18:06:51 develog-laptop gdm-session-worker[1307]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
May 20 18:06:51 develog-laptop kernel: [ 46.608036] eth1: no IPv6 routers present
May 20 18:06:51 develog-laptop rtkit-daemon[1315]: Sucessfully called chroot.
May 20 18:06:51 develog-laptop rtkit-daemon[1315]: S...

[Dr. Kenobi (drkenobi)]

Mikael, the screensaver seems not to be related. This unexpected logout's happen to me using Firefox, but I don't think the bug it's related to the browser. I think it's because the "browser or any application" gets slower and slower, almost freeze. My problem is maybe cos I have a small swap. Do you have enough memory and swap?

[Mikael Andersson (mikael-develog)]

Yes, there should be enough memory (1 Gbyte) and swap (1,3 Gbyte). Right now the memory usage is around 560 Mbyte and swap usage is around 15 Mbyte.

It is probably not Firefox itself, as you are saying, but some resources it is using, which get stressed. Are you using a 3G connection as well?

[Dr. Kenobi (drkenobi)]

No, I'm not using a 3G connection. Just a normal Wi-Fi.

[Mikael Andersson (mikael-develog)]

Status update: I was surfing a while ago on the web site idg.se for about fifteen minutes without any problems. Yesterday, the system crashed sometimes after less than a minute. This happened about four times in a row as soon as I was surfing the mentioned web site. Anyhow, the system seems stable so far today.

[Mikael Andersson (mikael-develog)]

Status update: Was working for a few hours yesterday evening (WLAN connection) and today (3G connection) without any crash. I have been using Firefox and visited the web site idg.se on which I have been surfing when I have got the previous crashes. So far so good.

[Mikael Andersson (mikael-develog)]

I have had a few crashes since last post. This time I succeeded to record the debug print outs from the modem-manager. Since I have not had any crashes when running with the WLAN, I thought it could be interesting to see if the 3G connection could be the problem. Below is the log.

** (modem-manager:1969): DEBUG: (ttyACM0): probe requested by plugin 'Generic'
** (modem-manager:1969): DEBUG: (ttyACM1): probe requested by plugin 'Generic'
** (modem-manager:1969): DEBUG: (ttyACM2): probe requested by plugin 'Generic'
** (modem-manager:1969): DEBUG: (ttyACM3): probe requested by plugin 'Generic'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- 'AT+GCAP<CR><CR><LF>+GCAP: +CGSM, +DS<CR><LF><CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM1): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM2): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM3): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM1): <-- 'AT+GCAP<CR><CR><LF>+GCAP: +CGSM, +DS<CR><LF><CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: Added modem /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4
** (modem-manager:1969): DEBUG: Exported modem /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4 as /org/freedesktop/ModemManager/Modems/0
** (modem-manager:1969): DEBUG: (ttyACM2): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM3): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM2): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM3): --> 'AT+GCAP<CR>'
** (modem-manager:1969): DEBUG: (ttyACM3): --> 'ATI<CR>'
** (modem-manager:1969): DEBUG: (ttyACM3): --> 'AT+CPIN?<CR>'
** (modem-manager:1969): DEBUG: (ttyACM3): --> 'AT+CGMM<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'ATZ E0 V1 +CMEE=1<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- 'ATZ E0 V1 +CMEE='
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '1<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'ATE0 +CMEE=1<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'ATX4 &C1<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+CREG=0<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+CFUN=1<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+CPIN?<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>+CPIN: READY<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+COPS=0,,<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+CREG?<CR>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>+CREG: 0,1<CR><LF>'
** (modem-manager:1969): DEBUG: (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
** (modem-manager:1969): DEBUG: Registration state changed: 1
** (modem-manager:1969): DEBUG: (ttyACM0): --> 'AT+COPS=3,2;+COPS?<CR>'
** (modem-manager...

[Mikael Andersson (mikael-develog)]

This evening, a new crash occurred. This time I was running with a WLAN connection. The laptop has been running fine for a few hours with Evolution, Firefox and Rhytmbox playing some music. As soon as I started surfing on the web site idg.se, which seem to have triggered all the previous crashes, the crash happened.

[Mikael Andersson (mikael-develog)]

I am not sure that my problem has been solved. Last week I googled some more and found the following bug report which seemed related to the one I have filed.
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/539772

I thus upgraded a few days ago according to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/539772/comments/29

After that, I have not had any problems. Let us see if my problem is gone.

[penalvch (penalvch)]

Mikael Andersson, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/582206/comments/22 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.