nm-applet doesn't detect that an ethernet cable is unplugged

Hi,

we need the complete /var/log/syslog to get all information needed to process this.

In addition we need the output of

lspci -vv

Thanks,
 - Alexander

Here is /var/log/syslog

This is the output from lspci -vv

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
 Subsystem: Hewlett-Packard Company Unknown device 30a2
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
 Latency: 0
 Capabilities: <access denied>

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA])
 Subsystem: Hewlett-Packard Company Unknown device 30a2
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0
 Interrupt: pin A routed to IRQ 16
 Region 0: Memory at f4400000 (32-bit, non-prefetchable) [size=512K]
 Region 1: I/O ports at 4000 [size=8]
 Region 2: Memory at e0000000 (32-bit, prefetchable) [size=256M]
 Region 3: Memory at f4480000 (32-bit, non-prefetchable) [size=256K]
 Capabilities: <access denied>

00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
 Subsystem: Hewlett-Packard Company Unknown device 30a2
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0
 Region 0: Memory at f4500000 (32-bit, non-prefetchable) [size=512K]
 Capabilities: <access denied>

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
 Subsystem: Hewlett-Packard Company Unknown device 30a2
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 16
 Region 0: Memory at f4580000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>

00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01) (prog-if 00 [Normal decode])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0, Cache Line Size: 64 bytes
 Bus: primary=00, secondary=08, subordinate=08, sec-latency=0
 Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
 BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
 Capabilities: <access denied>

00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01) (prog-if 00 [Normal decode])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0, Cache Line Size: 64 bytes
 Bus: primary=00, secondary=10, subordinate=10, sec-latency=0
 Memory behind bridge: f40...

The following information might be useful when analyzing the log file

I plugged the ethernet cable off started my computer.
Then I logged into Gnome.
At 17:12 I plugged the ethernet cable in.
The network manager didn't detect connection, although I was able to ping my router which was 192.168.0.1, but unable to ping www.yahoo.com.
At 17: 15 I typed
       sudo ifdown eth0; sudo ifup eth0

I've detected that whenever I plug the cable off a new log entry in /var/log/syslog is added

Dec 9 18:58:43 sgr-laptop kernel: [ 787.336000] b44: eth0: Link is down.

In addition, whenever I plug the cable in, the following message is logged:

Dec 9 19:00:40 sgr-laptop kernel: [ 904.336000] b44: eth0: Link is up at 100 Mbps, full duplex.
Dec 9 19:00:40 sgr-laptop kernel: [ 904.336000] b44: eth0: Flow control is off for TX and off for RX.

It proves that that Ubuntu detects removal/insertion of the ethernet cable, but network manager is not notified about the changes.

I've just reproduced the bug connecting my laptop directly to my ISP without my router which is d-link dl-604. This bug isn't connected with my router.

I've found how to fix this bug.
Remove the notification area from the gnome panel.
Then add the "network monotor" applet to the gnome panel.
Now everything is fine.