[Dell Latitude E7240] Wifi slider does not work.

[Po-Hsu Lin]

CID: 201304-13407 Dell Latitude E7240

The Wifi slider switch does not work on this system.

Steps:
1. Install 12.04.4, boot to desktop
2. Make sure Wifi is connected and use the switch to turn it off

Expected result:
* Wireless network could be disabled by the switch

Actual result:
* Nothing happened. Wireless network cannot be disabled by the switch, but it could be turned off by using the network manager UI.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.11.0-15-generic 3.11.0-15.25~precise1 [modified: boot/vmlinuz-3.11.0-15-generic]
ProcVersionSignature: Ubuntu 3.11.0-15.25~precise1-generic 3.11.10
Uname: Linux 3.11.0-15-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.11.0-15-generic.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 1: PCH [HDA Intel PCH], device 0: ALC292 Analog [ALC292 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: ubuntu 1497 F.... pulseaudio
 /dev/snd/controlC0: ubuntu 1497 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'MID'/'HDA Intel MID at 0xf7e34000 irq 65'
   Mixer name : 'Intel Haswell HDMI'
   Components : 'HDA:80862807,80860101,00100000'
   Controls : 21
   Simple ctrls : 3
Card1.Amixer.info:
 Card hw:1 'PCH'/'HDA Intel PCH at 0xf7e30000 irq 64'
   Mixer name : 'Realtek ALC292'
   Components : 'HDA:10ec0292,102805ca,00100001'
   Controls : 28
   Simple ctrls : 13
Date: Mon Feb 10 02:42:06 2014
HibernationDevice: RESUME=UUID=88b6917b-05a2-4e50-9884-bc52522c47a4
InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
MachineType: Dell Inc. Latitude E7240
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=c942dec6-e8d5-41b7-baf8-f3f81bd493d8 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-15-generic N/A
 linux-backports-modules-3.11.0-15-generic N/A
 linux-firmware 1.79.9
SourcePackage: linux-lts-saucy
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/05/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0G05MN
dmi.board.vendor: Dell Inc.
dmi.board.version: X01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd10/05/2013:svnDellInc.:pnLatitudeE7240:pvr01:rvnDellInc.:rn0G05MN:rvrX01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7240
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

[Edward Lin (airken)]

It seems that dell-laptop.c removed rfkill code in kernel 3.11.10
After that, rfkill code added back and whitelisted Latitude models with following 2 patches.
--
commit 4cc8a57425c623753b10b77b15392e5b83baa5a3
Author: Hans de Goede <email address hidden>
Date: Sun Nov 17 14:00:16 2013 +0100

    Revert "dell-laptop: Remove rfkill code"
--
commit 2a92551845bbbc8421ba908cd14bbdf065e0f454
Author: Hans de Goede <email address hidden>
Date: Sun Nov 17 14:00:17 2013 +0100

    dell-laptop: Only enable rfkill on Latitudes

I will test these 2 patches after getting the machine to see if it is the root cause of this issue.

[Edward Lin (airken)]

The patches are already included in 3.13.

[Yang Kun (YK) (dayangkuncn)]

nice, thanks