Comment 0 for bug 771857

After suspending and resuming, the network adapter appears to be active (Link UP) however it is not able to properly communicate data and appears in network-manager as disconnected due to the inability to negotiate DHCP successfully.

The workaround, in my case, is to execute this "fixnet" script following the resume to unload an reload the r8169 module. In 11.04 the network manager automatically reconnects at this point.

imac@repo:/usr/local/bin$ cat fixnet

#!/bin/sh
rmmod r8169
modprobe r8169

imac@repo:/usr/local/bin$ lspci -v | grep -i realtek
0a:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)

Here is a typical dmesg, showing the link up after resume (@5958) followed by my script execution (starting @ 6105).

[ 5956.140651] r8169 0000:0a:00.0: eth0: link down
[ 5958.247724] r8169 0000:0a:00.0: eth0: link up
[ 6105.570173] r8169 0000:0a:00.0: PCI INT A disabled
[ 6105.604106] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 6105.604141] r8169 0000:0a:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 6105.604191] r8169 0000:0a:00.0: setting latency timer to 64
[ 6105.604248] r8169 0000:0a:00.0: irq 45 for MSI/MSI-X
[ 6105.610321] r8169 0000:0a:00.0: eth0: RTL8168c/8111c at 0xffffc90002098000, 00:1e:ec:f2:0f:f3, XID 1c4000c0 IRQ 45
[ 6105.624882] r8169 0000:0a:00.0: eth0: link down
[ 6105.624896] r8169 0000:0a:00.0: eth0: link down
[ 6105.636108] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 6108.331777] r8169 0000:0a:00.0: eth0: link up
[ 6108.332388] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 6118.770054] eth0: no IPv6 routers present

Upstream we see this here: https://bugzilla.kernel.org/show_bug.cgi?id=12296

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: imac 2744 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xd2400000 irq 16'
   Mixer name : 'IDT 92HD71B7X'
   Components : 'HDA:111d76b2,103c30fd,00100302 HDA:11c11040,103c137e,00100200'
   Controls : 22
   Simple ctrls : 14
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd2310000 irq 46'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100000'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Wed Apr 27 10:16:01 2011
HibernationDevice: RESUME=UUID=5828f841-5250-4229-bfc5-af24c6f41811
MachineType: Hewlett-Packard HP Pavilion dv7 Notebook PC
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=52543d1c-6080-4cdf-80e0-30b9af3748f7 ro crashkernel=384M-2G:64M,2G-:128M splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.52
SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-04-06 (21 days ago)
WpaSupplicantLog:

dmi.bios.date: 08/17/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.49
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 30FD
dmi.board.vendor: Compal
dmi.board.version: 01.99
dmi.chassis.type: 10
dmi.chassis.vendor: Compal
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.49:bd08/17/2009:svnHewlett-Packard:pnHPPaviliondv7NotebookPC:pvr1:rvnCompal:rn30FD:rvr01.99:cvnCompal:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv7 Notebook PC
dmi.product.version: 1
dmi.sys.vendor: Hewlett-Packard