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[Cas <1037718@xxxxxxxxxxxxxxxxxx>]

I narrowed this down to working in kernel 2.6.38 (Natty) but stopped
working in 3.0 onwards.

Also it is not just suspend that affects the LED, using the hardware
wifi switch on the laptop results it the same problem that the LED is
permanently off after turning wifi back on.

The only way to get the LED back on without rebooting is to reload the
module: `rmmod iwl3945 && modprobe iwl3945`

Thus a workaround for the suspend issue is to add
SUSPEND_MODULES="iwl3945" to /etc/pm/config.d/modules

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https://bugs.launchpad.net/bugs/1037718

Title:
  Intel wifi led is off after resuming from suspend

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  I have set the wifi "options iwlegacy led_mode=1" in /etc/modprobe.d/wlan.conf to stop the led blinking, which works as expected. The problem I have found is that if I suspend the laptop then upon resuming the wifi led is permanently off yet
  the wifi still works properly.

  I noticed the same occuring in Precise but I think it was working in
  Oneiric.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-10-generic 3.5.0-10.10
  ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
  Uname: Linux 3.5.0-10-generic x86_64
  ApportVersion: 2.4-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  calum      1921 F.... pulseaudio
  CRDA:
   country GB:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  CheckboxSubmission: beb20350994a383f56f97def0e07bae1
  CheckboxSystem: d00f84de8a555815fa1c4660280da308
  Date: Thu Aug 16 19:23:53 2012
  HibernationDevice: RESUME=UUID=3f279429-3482-4734-86b6-cc41fa7ce020
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120223.1)
  MachineType: Dell Inc. Precision M4300
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-10-generic root=UUID=64e61881-95ee-4b3c-8714-c08c940f4966 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-10-generic N/A
   linux-backports-modules-3.5.0-10-generic  N/A
   linux-firmware                            1.89
  SourcePackage: linux
  UpgradeStatus: Upgraded to quantal on 2012-08-12 (3 days ago)
  dmi.bios.date: 01/20/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 0UY141
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd01/20/2010:svnDellInc.:pnPrecisionM4300:pvr:rvnDellInc.:rn0UY141:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Precision M4300
  dmi.sys.vendor: Dell Inc.

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