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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Verified after applying -update (3.16.0-45), this issue still exist.


** Also affects: hwe-next
   Importance: Undecided
       Status: New

** Changed in: linux-lts-utopic (Ubuntu)
     Assignee: (unassigned) => Keng-Yu Lin (lexical)

** Attachment added: "dmesg-updated.log"
   https://bugs.launchpad.net/hwe-next/+bug/1482085/+attachment/4440308/+files/dmesg-updated.log

** Changed in: linux-lts-utopic (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1482085

Title:
  [Dell Latitude 3450] Wireless key will make the Intel 7265 [8086:095a]
  wireless chip unusable

Status in HWE Next:
  New
Status in linux-lts-utopic package in Ubuntu:
  Confirmed

Bug description:
  CID: 201409-15477 Dell Latitude 3465

  The wireless key will make the wifi chip stop working after re-enabled. Reproduce rate is > 80%
  (It looks like if there is a wireless connection profile in the list this issue won't happen)

  Steps:
  1. Install 14.04.2 (3.16.0-30), boot to desktop
  2. Do not connect to the wireless network, disable the wireless network with the hotkey.
  3. Re-enable the wireless network with the hotkey

  Expected result:
  * Wireless network successfully disabled and re-enabled without problem. AP available for connect.

  Actual result:
  * Wireless network can't be re-enabled, no AP found in the list.

  03:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 3b)
   Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5400]
   Flags: bus master, fast devsel, latency 0, IRQ 63
   Memory at f7100000 (64-bit, non-prefetchable) [size=8K]
   Capabilities: <access denied>
   Kernel driver in use: iwlwifi

  Error message could be found in the dmesg output:
  [   72.376877] WARNING: CPU: 0 PID: 4 at /build/buildd/linux-lts-utopic-3.16.0/net/wireless/core.c:949 cfg80211_netdev_notifier_call+0x571/0x630 [cfg80211]()
  [   72.376879] Modules linked in: nls_iso8859_1 bbswitch(OE) bnep rfcomm snd_hda_codec_hdmi nvidia(POE) uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 dell_wmi sparse_keymap iwlmvm mxm_wmi joydev mac80211 i915 dell_laptop dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw btusb bluetooth 6lowpan_iphc i2c_hid hid snd_hda_codec_realtek snd_hda_codec_generic drm_kms_helper snd_soc_rt5640 snd_hda_intel snd_soc_rl6231 snd_hda_controller snd_soc_core snd_hda_codec snd_hwdep snd_compress snd_seq_midi snd_seq_midi_event snd_rawmidi drm snd_pcm_dmaengine snd_pcm i2c_designware_platform iwlwifi snd_seq cfg80211 snd_seq_device snd_timer snd_soc_sst_acpi snd mei_me mei 8250_dw shpchp parport_pc lpc_ich soundcore dw_dmac i2c_designware_core i2c_algo_bit dw_dmac_core video ppdev spi_pxa2xx_platform acpi_pad mac_hid wmi lp parport uas usb_storage psmouse ahci r8169 libahci mii sdhci_acpi sdhci
  [   72.376984] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: P           OE 3.16.0-30-generic #40~14.04.1-Ubuntu
  [   72.376986] Hardware name: Dell Inc. Latitude 3450/013C62, BIOS X51 09/17/2014
  [   72.376999] Workqueue: events cfg80211_rfkill_sync_work [cfg80211]
  [   72.377001]  0000000000000009 ffff880223cd7c28 ffffffff81762590 0000000000000000
  [   72.377005]  ffff880223cd7c60 ffffffff8106dd2d ffff88022387e8d0 ffff880219e24260
  [   72.377009]  ffff88022387e000 0000000000000002 ffff880219e24000 ffff880223cd7c70
  [   72.377012] Call Trace:
  [   72.377019]  [<ffffffff81762590>] dump_stack+0x45/0x56
  [   72.377024]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
  [   72.377028]  [<ffffffff8106de0a>] warn_slowpath_null+0x1a/0x20
  [   72.377040]  [<ffffffffc03844f1>] cfg80211_netdev_notifier_call+0x571/0x630 [cfg80211]
  [   72.377045]  [<ffffffff8165a81b>] ? __dev_remove_pack+0x8b/0xb0
  [   72.377049]  [<ffffffff8173df94>] ? __unregister_prot_hook+0xd4/0xe0
  [   72.377054]  [<ffffffff8109598c>] notifier_call_chain+0x4c/0x70
  [   72.377057]  [<ffffffff81095ab6>] raw_notifier_call_chain+0x16/0x20
  [   72.377061]  [<ffffffff8165b205>] call_netdevice_notifiers_info+0x35/0x60
  [   72.377064]  [<ffffffff8165b59e>] dev_close_many+0xce/0x120
  [   72.377068]  [<ffffffff8165d7f6>] dev_close.part.73+0x36/0x50
  [   72.377072]  [<ffffffff8165d831>] dev_close+0x21/0x30
  [   72.377083]  [<ffffffffc0383895>] cfg80211_shutdown_all_interfaces+0x45/0xb0 [cfg80211]
  [   72.377094]  [<ffffffffc038392b>] cfg80211_rfkill_sync_work+0x2b/0x40 [cfg80211]
  [   72.377098]  [<ffffffff81089ef2>] process_one_work+0x182/0x450
  [   72.377101]  [<ffffffff8108a663>] worker_thread+0x123/0x5a0
  [   72.377105]  [<ffffffff8108a540>] ? rescuer_thread+0x380/0x380
  [   72.377109]  [<ffffffff810912c2>] kthread+0xd2/0xf0
  [   72.377113]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  [   72.377117]  [<ffffffff8176ac3c>] ret_from_fork+0x7c/0xb0
  [   72.377121]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  [   72.377123] ---[ end trace 366f789c51388dbc ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Aug  6 02:44:01 2015
  InstallationDate: Installed on 2015-08-06 (0 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1698 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1698 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=899371a2-bbeb-4887-a6d6-ae545ac7830a
  InstallationDate: Installed on 2015-08-06 (0 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Dell Inc. Latitude 3450
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic root=UUID=3982d252-a35e-471c-8843-f038439c569f ro quiet splash
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-30-generic N/A
   linux-backports-modules-3.16.0-30-generic  N/A
   linux-firmware                             1.127.11
  Tags:  trusty
  Uname: Linux 3.16.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/04/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 013C62
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd08/04/2014:svnDellInc.:pnLatitude3450:pvr01:rvnDellInc.:rn013C62:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude 3450
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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