Daemon.log:

----------------- No mention of ttyusb before this point. Disconnected and connected modem again ----------------

May 29 02:09:36 bengt-desktop nm-system-settings:    SCPlugin-Ifupdown: devices removed (udi: /org/freedesktop/Hal/devices/usb_device_12d1_1003_noserial_if0_serial_usb_0)
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB1): ignoring due to lack of mobile broadband capabilties 
May 29 02:10:00 bengt-desktop nm-system-settings:    SCPlugin-Ifupdown: device added (udi: /org/freedesktop/Hal/devices/usb_device_12d1_1003_noserial_if0_serial_usb_0, iface: (null)): iface not found
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB0): found serial port (udev:GSM  hal:GSM) 
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB0): new Modem device (driver: 'option') 
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB0): exported as /org/freedesktop/Hal/devices/usb_device_12d1_1003_noserial_if0_serial_usb_0 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 1 -> 2 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): deactivating device (reason: 2). 
May 29 02:10:05 bengt-desktop NetworkManager: nm_system_device_flush_ip4_routes_with_iface: assertion `iface_idx >= 0' failed
May 29 02:10:05 bengt-desktop NetworkManager: nm_system_device_flush_ip4_addresses_with_iface: assertion `iface_idx >= 0' failed
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 2 -> 3 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) starting connection '3 (Bredband)' 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 3 -> 4 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled... 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started... 
May 29 02:10:05 bengt-desktop NetworkManager: <debug> [1243555805.011138] nm_serial_device_open(): (ttyUSB0) opening device... 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete. 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): powering up... 
May 29 02:10:10 bengt-desktop NetworkManager: <info>  Searching for a network... 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Registered on Roaming network 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Associated with network: +COPS: 0,0,"SWEDEN",2 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Connected, Woo! 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 2 of 5 (Device Configure) scheduled... 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 2 of 5 (Device Configure) starting... 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 4 -> 5 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Starting pppd connection 
May 29 02:10:11 bengt-desktop NetworkManager: <debug> [1243555811.499749] nm_ppp_manager_start(): Command line: /usr/sbin/pppd nodetach lock nodefaultroute ttyUSB0 noipdefault noauth usepeerdns lcp-echo-failure 0 lcp-echo-interval 0 ipparam /org/freedesktop/NetworkManager/PPP/0 plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so 
May 29 02:10:11 bengt-desktop NetworkManager: <debug> [1243555811.516001] nm_ppp_manager_start(): ppp started with pid 3796 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 2 of 5 (Device Configure) complete. 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 5 -> 6 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 6 -> 7 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  PPP manager(IP Config Get) reply received. 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 4 of 5 (IP Configure Get) scheduled... 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 4 of 5 (IP Configure Get) started... 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 5 of 5 (IP Configure Commit) scheduled... 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 4 of 5 (IP Configure Get) complete. 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 5 of 5 (IP Configure Commit) started... 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 7 -> 8 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  Policy set '3 (Bredband)' (ppp0) as default for routing and DNS. 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) successful, device activated. 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 5 of 5 (IP Configure Commit) complete. 
May 29 02:10:17 bengt-desktop nm-dispatcher.action: Script '/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status 1.
May 29 02:10:19 bengt-desktop ntpdate[4018]: adjust time server 91.189.94.4 offset 0.306971 sec

Kern.log:
May 29 02:08:04 bengt-desktop kernel: [   20.886981] ppdev0: registered pardevice
May 29 02:08:04 bengt-desktop kernel: [   20.936248] ppdev0: unregistered pardevice
May 29 02:08:05 bengt-desktop kernel: [   21.726274] ADDRCONF(NETDEV_UP): eth0: link is not ready
May 29 02:08:05 bengt-desktop kernel: [   21.729139] e100: eth0: e100_watchdog: link up, 100Mbps, full-duplex
May 29 02:08:05 bengt-desktop kernel: [   21.733790] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
May 29 02:08:15 bengt-desktop kernel: [   32.076035] eth0: no IPv6 routers present

-------------------------------- Disconnected and connected modem here -----------------------------------------------

May 29 02:09:36 bengt-desktop kernel: [  113.488060] usb 5-2: USB disconnect, address 2
May 29 02:09:36 bengt-desktop kernel: [  113.490607] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
May 29 02:09:36 bengt-desktop kernel: [  113.490647] option 5-2:1.0: device disconnected
May 29 02:09:36 bengt-desktop kernel: [  113.493991] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
May 29 02:09:36 bengt-desktop kernel: [  113.494033] option 5-2:1.1: device disconnected
May 29 02:09:59 bengt-desktop kernel: [  135.812035] usb 5-2: new full speed USB device using uhci_hcd and address 3
May 29 02:09:59 bengt-desktop kernel: [  135.971105] usb 5-2: configuration #1 chosen from 1 choice
May 29 02:09:59 bengt-desktop kernel: [  135.987215] usb-storage: probe of 5-2:1.0 failed with error -1
May 29 02:09:59 bengt-desktop kernel: [  136.056059] usb 5-2: USB disconnect, address 3
May 29 02:10:00 bengt-desktop kernel: [  136.792037] usb 5-2: new full speed USB device using uhci_hcd and address 4
May 29 02:10:00 bengt-desktop kernel: [  136.951932] usb 5-2: configuration #1 chosen from 1 choice
May 29 02:10:00 bengt-desktop kernel: [  136.962089] usb-storage: probe of 5-2:1.0 failed with error -5
May 29 02:10:00 bengt-desktop kernel: [  136.962113] option 5-2:1.0: GSM modem (1-port) converter detected
May 29 02:10:00 bengt-desktop kernel: [  136.962283] usb 5-2: GSM modem (1-port) converter now attached to ttyUSB0
May 29 02:10:00 bengt-desktop kernel: [  136.967887] usb-storage: probe of 5-2:1.1 failed with error -5
May 29 02:10:00 bengt-desktop kernel: [  136.967913] option 5-2:1.1: GSM modem (1-port) converter detected
May 29 02:10:00 bengt-desktop kernel: [  136.968075] usb 5-2: GSM modem (1-port) converter now attached to ttyUSB1
May 29 02:10:00 bengt-desktop kernel: [  137.014892] usb-storage: probe of 5-2:1.2 failed with error -1
May 29 02:10:11 bengt-desktop kernel: [  148.489639] PPP BSD Compression module registered
May 29 02:10:11 bengt-desktop kernel: [  148.516137] PPP Deflate Compression module registered

Syslog:

------------------ No mention of ttyusb before this point. Disconnected modem here -----------------------------

May 29 02:09:36 bengt-desktop kernel: [  113.488060] usb 5-2: USB disconnect, address 2
May 29 02:09:36 bengt-desktop kernel: [  113.490607] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
May 29 02:09:36 bengt-desktop kernel: [  113.490647] option 5-2:1.0: device disconnected
May 29 02:09:36 bengt-desktop kernel: [  113.493991] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
May 29 02:09:36 bengt-desktop kernel: [  113.494033] option 5-2:1.1: device disconnected
May 29 02:09:36 bengt-desktop nm-system-settings:    SCPlugin-Ifupdown: devices removed (udi: /org/freedesktop/Hal/devices/usb_device_12d1_1003_noserial_if0_serial_usb_0)
May 29 02:09:59 bengt-desktop kernel: [  135.812035] usb 5-2: new full speed USB device using uhci_hcd and address 3
May 29 02:09:59 bengt-desktop kernel: [  135.971105] usb 5-2: configuration #1 chosen from 1 choice
May 29 02:09:59 bengt-desktop kernel: [  135.987215] usb-storage: probe of 5-2:1.0 failed with error -1
May 29 02:09:59 bengt-desktop kernel: [  136.056059] usb 5-2: USB disconnect, address 3
May 29 02:10:00 bengt-desktop kernel: [  136.792037] usb 5-2: new full speed USB device using uhci_hcd and address 4
May 29 02:10:00 bengt-desktop kernel: [  136.951932] usb 5-2: configuration #1 chosen from 1 choice
May 29 02:10:00 bengt-desktop kernel: [  136.962089] usb-storage: probe of 5-2:1.0 failed with error -5
May 29 02:10:00 bengt-desktop kernel: [  136.962113] option 5-2:1.0: GSM modem (1-port) converter detected
May 29 02:10:00 bengt-desktop kernel: [  136.962283] usb 5-2: GSM modem (1-port) converter now attached to ttyUSB0
May 29 02:10:00 bengt-desktop kernel: [  136.967887] usb-storage: probe of 5-2:1.1 failed with error -5
May 29 02:10:00 bengt-desktop kernel: [  136.967913] option 5-2:1.1: GSM modem (1-port) converter detected
May 29 02:10:00 bengt-desktop kernel: [  136.968075] usb 5-2: GSM modem (1-port) converter now attached to ttyUSB1
May 29 02:10:00 bengt-desktop kernel: [  137.014892] usb-storage: probe of 5-2:1.2 failed with error -1
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB1): ignoring due to lack of mobile broadband capabilties 
May 29 02:10:00 bengt-desktop nm-system-settings:    SCPlugin-Ifupdown: device added (udi: /org/freedesktop/Hal/devices/usb_device_12d1_1003_noserial_if0_serial_usb_0, iface: (null)): iface not found
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB0): found serial port (udev:GSM  hal:GSM) 
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB0): new Modem device (driver: 'option') 
May 29 02:10:00 bengt-desktop NetworkManager: <info>  (ttyUSB0): exported as /org/freedesktop/Hal/devices/usb_device_12d1_1003_noserial_if0_serial_usb_0 
May 29 02:10:01 bengt-desktop /USR/SBIN/CRON[3467]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 1 -> 2 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): deactivating device (reason: 2). 
May 29 02:10:05 bengt-desktop NetworkManager: nm_system_device_flush_ip4_routes_with_iface: assertion `iface_idx >= 0' failed
May 29 02:10:05 bengt-desktop NetworkManager: nm_system_device_flush_ip4_addresses_with_iface: assertion `iface_idx >= 0' failed
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 2 -> 3 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) starting connection '3 (Bredband)' 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 3 -> 4 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled... 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started... 
May 29 02:10:05 bengt-desktop NetworkManager: <debug> [1243555805.011138] nm_serial_device_open(): (ttyUSB0) opening device... 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete. 
May 29 02:10:05 bengt-desktop NetworkManager: <info>  (ttyUSB0): powering up... 
May 29 02:10:10 bengt-desktop NetworkManager: <info>  Searching for a network... 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Registered on Roaming network 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Associated with network: +COPS: 0,0,"SWEDEN",2 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Connected, Woo! 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 2 of 5 (Device Configure) scheduled... 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 2 of 5 (Device Configure) starting... 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 4 -> 5 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Starting pppd connection 
May 29 02:10:11 bengt-desktop NetworkManager: <debug> [1243555811.499749] nm_ppp_manager_start(): Command line: /usr/sbin/pppd nodetach lock nodefaultroute ttyUSB0 noipdefault noauth usepeerdns lcp-echo-failure 0 lcp-echo-interval 0 ipparam /org/freedesktop/NetworkManager/PPP/0 plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so 
May 29 02:10:11 bengt-desktop NetworkManager: <debug> [1243555811.516001] nm_ppp_manager_start(): ppp started with pid 3796 
May 29 02:10:11 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 2 of 5 (Device Configure) complete. 
May 29 02:10:11 bengt-desktop pppd[3796]: Plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so loaded.
May 29 02:10:11 bengt-desktop pppd[3796]: pppd 2.4.5 started by root, uid 0
May 29 02:10:11 bengt-desktop pppd[3796]: Using interface ppp0
May 29 02:10:11 bengt-desktop pppd[3796]: Connect: ppp0 <--> /dev/ttyUSB0
May 29 02:10:11 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 5 -> 6 
May 29 02:10:11 bengt-desktop pppd[3796]: CHAP authentication succeeded
May 29 02:10:11 bengt-desktop pppd[3796]: CHAP authentication succeeded
May 29 02:10:11 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 6 -> 7 
May 29 02:10:11 bengt-desktop kernel: [  148.489639] PPP BSD Compression module registered
May 29 02:10:11 bengt-desktop kernel: [  148.516137] PPP Deflate Compression module registered
May 29 02:10:14 bengt-desktop pppd[3796]: Could not determine remote IP address: defaulting to 10.64.64.64
May 29 02:10:14 bengt-desktop pppd[3796]: Cannot determine ethernet address for proxy ARP
May 29 02:10:14 bengt-desktop pppd[3796]: local  IP address 95.209.90.212
May 29 02:10:14 bengt-desktop pppd[3796]: remote IP address 10.64.64.64
May 29 02:10:14 bengt-desktop pppd[3796]: primary   DNS address 80.251.201.177
May 29 02:10:14 bengt-desktop pppd[3796]: secondary DNS address 80.251.201.178
May 29 02:10:14 bengt-desktop NetworkManager: <info>  PPP manager(IP Config Get) reply received. 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 4 of 5 (IP Configure Get) scheduled... 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 4 of 5 (IP Configure Get) started... 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 5 of 5 (IP Configure Commit) scheduled... 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 4 of 5 (IP Configure Get) complete. 
May 29 02:10:14 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 5 of 5 (IP Configure Commit) started... 
May 29 02:10:14 bengt-desktop kernel: [  151.445303] ip_tables: (C) 2000-2006 Netfilter Core Team
May 29 02:10:14 bengt-desktop kernel: [  151.499963] nf_conntrack version 0.5.0 (16127 buckets, 64508 max)
May 29 02:10:14 bengt-desktop kernel: [  151.501363] CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use
May 29 02:10:14 bengt-desktop kernel: [  151.501369] nf_conntrack.acct=1 kernel paramater, acct=1 nf_conntrack module option or
May 29 02:10:14 bengt-desktop kernel: [  151.501374] sysctl net.netfilter.nf_conntrack_acct=1 to enable it.
May 29 02:10:15 bengt-desktop NetworkManager: <info>  (ttyUSB0): device state change: 7 -> 8 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  Policy set '3 (Bredband)' (ppp0) as default for routing and DNS. 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) successful, device activated. 
May 29 02:10:15 bengt-desktop NetworkManager: <info>  Activation (ttyUSB0) Stage 5 of 5 (IP Configure Commit) complete. 
May 29 02:10:17 bengt-desktop nm-dispatcher.action: Script '/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status 1.
May 29 02:10:19 bengt-desktop ntpdate[4018]: adjust time server 91.189.94.4 offset 0.306971 sec
May 29 02:17:01 bengt-desktop /USR/SBIN/CRON[4033]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
May 29 02:20:01 bengt-desktop /USR/SBIN/CRON[4244]: (root) CMD ([ -x /usr/sbin/update-motd ] && /usr/sbin/update-motd 2>/dev/null)

Debug:
May 29 02:08:04 bengt-desktop kernel: [   20.886981] ppdev0: registered pardevice
May 29 02:08:04 bengt-desktop kernel: [   20.936248] ppdev0: unregistered pardevice
May 29 02:08:15 bengt-desktop kernel: [   32.076035] eth0: no IPv6 routers present
---------------- Disconnecting modem, then connecting it again here --------------------------------------------
May 29 02:10:05 bengt-desktop NetworkManager: <debug> [1243555805.011138] nm_serial_device_open(): (ttyUSB0) opening device... 
May 29 02:10:11 bengt-desktop NetworkManager: <debug> [1243555811.499749] nm_ppp_manager_start(): Command line: /usr/sbin/pppd nodetach lock nodefaultroute ttyUSB0 noipdefault noauth usepeerdns lcp-echo-failure 0 lcp-echo-interval 0 ipparam /org/freedesktop/NetworkManager/PPP/0 plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so 
May 29 02:10:11 bengt-desktop NetworkManager: <debug> [1243555811.516001] nm_ppp_manager_start(): ppp started with pid 3796