Lost web access after suspend/resume

Thanks for reporting this bug.
I have a couple of questions for you
Can you give some output from dmesg at the time you resume? Also is the IP address shown above the same that is issued when you do a reboot, or when the network is functioning properly?

David Portwood: I appended more info you requested, to original request above (gn8584)

Can you try to disable wired networking, then re-enable it after it fails on resume, it appears network manager is not asking for a new IP address from the DHCP server. Let me know how this goes.

I recall that I tried turning wired connection off and on with System>Admin>Network and it didn't help (I have to wait for the next resume problem to try it again)
I tried turning the graphics system off and on with alt-ctrl-backspace. This closes all apps, shuts down the window system, and makes me log in again. No help.
Also someone on a forum suggested:
   sudo /etc/dbus-1/event.d/25NetworkManager stop
   sudo /etc/dbus-1/event.d/25NetworkManager start
but I don't think I understand what it does. It didn't help

Do you more specific recommendations?
Occurs to me I didn't try a very simple thing--unplugging the wire and plugging it back in. Does sound unlikely.

Thanks for your help.

Those commands will stop and start network manager, you can also combine them into a single command sudh as:
'sudo /etc/dbus-1/event.d/25NetworkManager restart'

I'm pretty sure after a resume, right click on network-manager applet on the upper systeray area, uncheck enable networking, then recheck enable networking will solve this, so next time you run into the problem on resume give that a shot.

Success, I think. I used "Network administration tool" in system>Admin>network to un-check and re-check wired network. This time it worked. I'll have to try it again next time I have a failure. It acted differently than usual, quickly processing my changes instead of taking 20 or 30 seconds. The next step, if it is working, will be to write a shell script to do it with a click. (Not turning Net manager off, but turning off the connection?) I'll let you know what happens.

Failed again.
I turned on videos on two web sites on Firefox browser, followed by suspend. Videos had a history of problems, or I wouldn't notice. Then I did suspend/resume and lost network contact. Then I tried network config tool and network manager manual config. I got the long wait for during "Changing Interface Configuration" No re-connection even though it says "Wired network connection"

Funny that it behaved differently that one time, and reconnected. I'm sure there is a simple solution. Any more ideas?

I think your confusing it by using both, Can you try just using network-manager the one with the icon in the systray. For testing, do not use system --> admin --> network, just network-manager applet. By using a manual config + network manager it gets confused, network-manager expects the file /etc/network/interfaces to all be set to auto, such as:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
auto ath1
iface ath1 inet dhcp

Hope this helps.
David

I still have a problem, but less often. I thought Network Manager might be part of the problem, so I dissabled it and tried to establish a connection but no luck yet.
I can tell when the connection is off because of all the zeros in "Network Manager--Active Connection Information" (see top post).
I noticed an strange thing: /etc/network/interfaces looks like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
# The primary network interface
iface eth0 inet dhcp
iface eth1 inet dhcp
wireless-essid linksys
auto eth1
auto eth0

But after a fault, there are a bunch of blank lines inserted after the line 'wireless-essid linksys' or in other places. Can 5 or 10 blank lines cause a problem?

When I first noticed the blank lines, I edited them out, and didn't have a problem for several days. When connection dropped, some of the blank lines were back.

------David

More information:
:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d3)
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03)
00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Modem Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 03)
00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
03:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
03:01.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b3)
03:01.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 08)
03:01.2 Generic system peripheral [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 17)
03:03.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
david@davidf:~$

The forum thread is here
http://ubuntuforums.org/showthread.php?p=2960591#poststop

You can make this into a script

'echo /etc/init.d/dbus restart > dbus.sh'
'chmod +x dbus.sh'

then if your using gnome create a new launcher by right clicking on the desktop new launcher, then name it whatever you want, and in the command blank put 'gksudo dbus.sh'