Public bug reported:

This bug is still present in 16.04.  When using the iwlegacy driver, the
default behavior is to have the blue LED indicator flash whenever
traffic is going over the wireless.  This is annoying, as it is in the
user's face on most laptops.

The workaround is to add something like this to a new file named 
/etc/modprobe.d/iwled.conf 
 
   options iwlegacy led_mode=1

I suggest that this mode be the default, and require a configuration
change to ENABLE the flashing.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-extra-4.4.0-36-generic 4.4.0-36.55
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.4.0-36-generic.
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  davek      3358 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf4580000 irq 28'
   Mixer name   : 'Analog Devices AD1981'
   Components   : 'HDA:11d41981,103c30a2,00100200 
HDA:11c13026,103c30a2,00100700'
   Controls      : 34
   Simple ctrls  : 17
CurrentDesktop: LXDE
Date: Fri Sep  9 00:17:14 2016
HibernationDevice: RESUME=UUID=63b899e1-b597-4a6c-9295-5403efb298d6
InstallationDate: Installed on 2016-07-12 (58 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release i386 
(20160420.3)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Hewlett-Packard HP Compaq nx7400 (RB525UT#ABA)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic 
root=UUID=e8da51fc-5ebb-4d97-aaeb-0ba3f9856171 ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-36-generic N/A
 linux-backports-modules-4.4.0-36-generic  N/A
 linux-firmware                            1.157.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/28/2006
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68YGU Ver. F.07
dmi.board.name: 30A2
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 40.16
dmi.chassis.asset.tag: CNU6362XLV
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68YGUVer.F.07:bd07/28/2006:svnHewlett-Packard:pnHPCompaqnx7400(RB525UT#ABA):pvrF.07:rvnHewlett-Packard:rn30A2:rvrKBCVersion40.16:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq nx7400 (RB525UT#ABA)
dmi.product.version: F.07
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-bug i386 xenial

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https://bugs.launchpad.net/bugs/1621725

Title:
  iwlegacy/iwl3945 driver flashes LED on traffic by default

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