The mainline kernel resolves the bug.

** Description changed:

  I have a lenovo T500 and when booting on battery the Ethernet card does
  not work. If the laptop is on AC it does. If I plug the AC in after boot
  the Ethernet card begins to work and remains working even if the AC is
  removed.
  
  Ethernet works if the acpi=off is added to grub.
- --- 
+ ---
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  cprofitt   2009 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  cprofitt   2009 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=96605a0a-95c6-4f73-a82b-9b283b3313fe
  InstallationDate: Installed on 2013-01-13 (82 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130111)
  MachineType: LENOVO 2081CTO
  MarkForUpload: True
  Package: linux 3.8.0.16.31
  PackageArchitecture: amd64
  PccardctlIdent:
-  Socket 0:
-    no product info available
+  Socket 0:
+    no product info available
  PccardctlStatus:
-  Socket 0:
-    no card
+  Socket 0:
+    no card
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-15-generic 
root=UUID=860735d2-7dc0-4a91-a04e-67b5d5bbdc40 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-15.25-generic 3.8.4
  RelatedPackageVersions:
-  linux-restricted-modules-3.8.0-15-generic N/A
-  linux-backports-modules-3.8.0-15-generic  N/A
-  linux-firmware                            1.104
+  linux-restricted-modules-3.8.0-15-generic N/A
+  linux-backports-modules-3.8.0-15-generic  N/A
+  linux-firmware                            1.104
  Tags: third-party-packages raring
  Uname: Linux 3.8.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  dmi.bios.date: 12/14/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6FET92WW (3.22 )
  dmi.board.name: 2081CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvr6FET92WW(3.22):bd12/14/2011:svnLENOVO:pn2081CTO:pvrThinkPadT500:rvnLENOVO:rn2081CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2081CTO
  dmi.product.version: ThinkPad T500
  dmi.sys.vendor: LENOVO

** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1165248

Title:
  Ethernet does not work on battery

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