> the kernel warnings do not happen either. I spoke too soon. I saw those warnings again with kernel 3.16.0-29.39. Therefore this bug cannot be reproduced at any time.
Dec 21 10:06:44 vougeot kernel: [ 340.419664] iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio. Dec 21 10:06:44 vougeot kernel: [ 340.431512] ------------[ cut here ]------------ Dec 21 10:06:44 vougeot kernel: [ 340.431585] WARNING: CPU: 3 PID: 94 at /build/buildd/linux-3.16.0/net/wireless/core.c:949 cfg80211_netdev_notifier_call+0x5b9/0x630 [cfg80211]() Dec 21 10:06:44 vougeot kernel: [ 340.431593] Modules linked in: hid_generic hidp hid ctr ccm dm_crypt btusb dell_wmi sparse_keymap snd_hda_codec_hdmi rfcomm bnep arc4 snd_hda_codec_idt snd_hda_codec_generic dell_laptop dcdbas bluetooth 6lowpan_iphc snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_pcm ghash_clmulni_intel iwlmvm mac80211 snd_seq_midi snd_seq_midi_event snd_rawmidi aesni_intel snd_seq aes_x86_64 lrw gf128mul iwlwifi glue_helper ablk_helper cryptd joydev binfmt_misc serio_raw cfg80211 snd_seq_device snd_timer lpc_ich snd shpchp soundcore dell_smo8800 mei_me mei mac_hid parport_pc ppdev tpm_rng lp parport btrfs xor raid6_pq i915 psmouse firewire_ohci ahci i2c_algo_bit libahci e1000e drm_kms_helper drm sdhci_pci firewire_core sdhci ptp crc_itu_t pps_core wmi video Dec 21 10:06:44 vougeot kernel: [ 340.431790] CPU: 3 PID: 94 Comm: kworker/3:1 Not tainted 3.16.0-29-generic #39-Ubuntu Dec 21 10:06:44 vougeot kernel: [ 340.431797] Hardware name: Dell Inc. Latitude E6520/0NVF5K, BIOS A19 11/14/2013 Dec 21 10:06:44 vougeot kernel: [ 340.431832] Workqueue: events cfg80211_rfkill_sync_work [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.431839] 0000000000000009 ffff88021e5e7c28 ffffffff8178218a 0000000000000000 Dec 21 10:06:44 vougeot kernel: [ 340.431850] ffff88021e5e7c60 ffffffff8106fedd ffff88021d5268d0 ffff880220bf0260 Dec 21 10:06:44 vougeot kernel: [ 340.431865] 0000000000000002 ffff88021d526000 ffff880220bf0000 ffff88021e5e7c70 Dec 21 10:06:44 vougeot kernel: [ 340.431876] Call Trace: Dec 21 10:06:44 vougeot kernel: [ 340.431899] [<ffffffff8178218a>] dump_stack+0x45/0x56 Dec 21 10:06:44 vougeot kernel: [ 340.431913] [<ffffffff8106fedd>] warn_slowpath_common+0x7d/0xa0 Dec 21 10:06:44 vougeot kernel: [ 340.431924] [<ffffffff8106ffba>] warn_slowpath_null+0x1a/0x20 Dec 21 10:06:44 vougeot kernel: [ 340.431960] [<ffffffffc0456629>] cfg80211_netdev_notifier_call+0x5b9/0x630 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.431979] [<ffffffff810b92d4>] ? __wake_up+0x44/0x50 Dec 21 10:06:44 vougeot kernel: [ 340.431992] [<ffffffff8166977a>] ? sock_def_error_report+0x3a/0x60 Dec 21 10:06:44 vougeot kernel: [ 340.432006] [<ffffffff8109972d>] notifier_call_chain+0x4d/0x70 Dec 21 10:06:44 vougeot kernel: [ 340.432022] [<ffffffff81099856>] raw_notifier_call_chain+0x16/0x20 Dec 21 10:06:44 vougeot kernel: [ 340.432035] [<ffffffff8167b755>] call_netdevice_notifiers_info+0x35/0x60 Dec 21 10:06:44 vougeot kernel: [ 340.432046] [<ffffffff8167baf8>] dev_close_many+0xc8/0x120 Dec 21 10:06:44 vougeot kernel: [ 340.432063] [<ffffffff8167dcc6>] dev_close.part.71+0x36/0x50 Dec 21 10:06:44 vougeot kernel: [ 340.432073] [<ffffffff8167dd01>] dev_close+0x21/0x30 Dec 21 10:06:44 vougeot kernel: [ 340.432108] [<ffffffffc04558e5>] cfg80211_shutdown_all_interfaces+0x45/0xc0 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432142] [<ffffffffc045598b>] cfg80211_rfkill_sync_work+0x2b/0x40 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432153] [<ffffffff8108da32>] process_one_work+0x182/0x4e0 Dec 21 10:06:44 vougeot kernel: [ 340.432162] [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0 Dec 21 10:06:44 vougeot kernel: [ 340.432178] [<ffffffff81784e0d>] ? __schedule+0x39d/0x890 Dec 21 10:06:44 vougeot kernel: [ 340.432187] [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0 Dec 21 10:06:44 vougeot kernel: [ 340.432199] [<ffffffff81094c6b>] kthread+0xdb/0x100 Dec 21 10:06:44 vougeot kernel: [ 340.432210] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 Dec 21 10:06:44 vougeot kernel: [ 340.432228] [<ffffffff8178a0fc>] ret_from_fork+0x7c/0xb0 Dec 21 10:06:44 vougeot kernel: [ 340.432239] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 Dec 21 10:06:44 vougeot kernel: [ 340.432246] ---[ end trace 4b8b4bc277e5e82a ]--- Dec 21 10:06:44 vougeot kernel: [ 340.432259] ------------[ cut here ]------------ Dec 21 10:06:44 vougeot kernel: [ 340.432302] WARNING: CPU: 3 PID: 94 at /build/buildd/linux-3.16.0/net/mac80211/driver-ops.h:12 ieee80211_request_sched_scan_stop+0x155/0x170 [mac80211]() Dec 21 10:06:44 vougeot kernel: [ 340.432313] wlan1: Failed check-sdata-in-driver check, flags: 0x4 Dec 21 10:06:44 vougeot kernel: [ 340.432317] Modules linked in: hid_generic hidp hid ctr ccm dm_crypt btusb dell_wmi sparse_keymap snd_hda_codec_hdmi rfcomm bnep arc4 snd_hda_codec_idt snd_hda_codec_generic dell_laptop dcdbas bluetooth 6lowpan_iphc snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_pcm ghash_clmulni_intel iwlmvm mac80211 snd_seq_midi snd_seq_midi_event snd_rawmidi aesni_intel snd_seq aes_x86_64 lrw gf128mul iwlwifi glue_helper ablk_helper cryptd joydev binfmt_misc serio_raw cfg80211 snd_seq_device snd_timer lpc_ich snd shpchp soundcore dell_smo8800 mei_me mei mac_hid parport_pc ppdev tpm_rng lp parport btrfs xor raid6_pq i915 psmouse firewire_ohci ahci i2c_algo_bit libahci e1000e drm_kms_helper drm sdhci_pci firewire_core sdhci ptp crc_itu_t pps_core wmi video Dec 21 10:06:44 vougeot kernel: [ 340.432508] CPU: 3 PID: 94 Comm: kworker/3:1 Tainted: G W 3.16.0-29-generic #39-Ubuntu Dec 21 10:06:44 vougeot kernel: [ 340.432514] Hardware name: Dell Inc. Latitude E6520/0NVF5K, BIOS A19 11/14/2013 Dec 21 10:06:44 vougeot kernel: [ 340.432545] Workqueue: events cfg80211_rfkill_sync_work [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432550] 0000000000000009 ffff88021e5e7b58 ffffffff8178218a ffff88021e5e7ba0 Dec 21 10:06:44 vougeot kernel: [ 340.432560] ffff88021e5e7b90 ffffffff8106fedd 0000000000000000 ffff880220bf0680 Dec 21 10:06:44 vougeot kernel: [ 340.432569] ffff880220bf13b8 00000000fffffffb ffff88021d5268c0 ffff88021e5e7bf0 Dec 21 10:06:44 vougeot kernel: [ 340.432585] Call Trace: Dec 21 10:06:44 vougeot kernel: [ 340.432597] [<ffffffff8178218a>] dump_stack+0x45/0x56 Dec 21 10:06:44 vougeot kernel: [ 340.432607] [<ffffffff8106fedd>] warn_slowpath_common+0x7d/0xa0 Dec 21 10:06:44 vougeot kernel: [ 340.432624] [<ffffffff8106ff4c>] warn_slowpath_fmt+0x4c/0x50 Dec 21 10:06:44 vougeot kernel: [ 340.432636] [<ffffffff8177e4cf>] ? printk+0x63/0x6b Dec 21 10:06:44 vougeot kernel: [ 340.432674] [<ffffffffc05bb7d5>] ieee80211_request_sched_scan_stop+0x155/0x170 [mac80211] Dec 21 10:06:44 vougeot kernel: [ 340.432718] [<ffffffffc05cae5d>] ieee80211_sched_scan_stop+0x2d/0x40 [mac80211] Dec 21 10:06:44 vougeot kernel: [ 340.432758] [<ffffffffc045fe38>] __cfg80211_stop_sched_scan+0x58/0x130 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432793] [<ffffffffc0456633>] cfg80211_netdev_notifier_call+0x5c3/0x630 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432804] [<ffffffff810b92d4>] ? __wake_up+0x44/0x50 Dec 21 10:06:44 vougeot kernel: [ 340.432821] [<ffffffff8166977a>] ? sock_def_error_report+0x3a/0x60 Dec 21 10:06:44 vougeot kernel: [ 340.432833] [<ffffffff8109972d>] notifier_call_chain+0x4d/0x70 Dec 21 10:06:44 vougeot kernel: [ 340.432842] [<ffffffff81099856>] raw_notifier_call_chain+0x16/0x20 Dec 21 10:06:44 vougeot kernel: [ 340.432853] [<ffffffff8167b755>] call_netdevice_notifiers_info+0x35/0x60 Dec 21 10:06:44 vougeot kernel: [ 340.432869] [<ffffffff8167baf8>] dev_close_many+0xc8/0x120 Dec 21 10:06:44 vougeot kernel: [ 340.432880] [<ffffffff8167dcc6>] dev_close.part.71+0x36/0x50 Dec 21 10:06:44 vougeot kernel: [ 340.432890] [<ffffffff8167dd01>] dev_close+0x21/0x30 Dec 21 10:06:44 vougeot kernel: [ 340.432924] [<ffffffffc04558e5>] cfg80211_shutdown_all_interfaces+0x45/0xc0 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432957] [<ffffffffc045598b>] cfg80211_rfkill_sync_work+0x2b/0x40 [cfg80211] Dec 21 10:06:44 vougeot kernel: [ 340.432967] [<ffffffff8108da32>] process_one_work+0x182/0x4e0 Dec 21 10:06:44 vougeot kernel: [ 340.432982] [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0 Dec 21 10:06:44 vougeot kernel: [ 340.432991] [<ffffffff81784e0d>] ? __schedule+0x39d/0x890 Dec 21 10:06:44 vougeot kernel: [ 340.433000] [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0 Dec 21 10:06:44 vougeot kernel: [ 340.433011] [<ffffffff81094c6b>] kthread+0xdb/0x100 Dec 21 10:06:44 vougeot kernel: [ 340.433028] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 Dec 21 10:06:44 vougeot kernel: [ 340.433038] [<ffffffff8178a0fc>] ret_from_fork+0x7c/0xb0 Dec 21 10:06:44 vougeot kernel: [ 340.433049] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 Dec 21 10:06:44 vougeot kernel: [ 340.433055] ---[ end trace 4b8b4bc277e5e82b ]--- ** Changed in: linux (Ubuntu) Status: Fix Released => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1401624 Title: kernel WARNINGs when disabling WiFi with RF kill switch on Intel chip Status in linux package in Ubuntu: Confirmed Bug description: I have a laptop with this WiFi controller: 02:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b) Subsystem: Intel Corporation Dual Band Wireless-AC 7260 Flags: bus master, fast devsel, latency 0, IRQ 47 Memory at e2d00000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlwifi I switched WiFi off with the RF kill switch and got those errors: [19011.796623] iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio. [19011.797807] ------------[ cut here ]------------ [19011.797848] WARNING: CPU: 1 PID: 6870 at /build/buildd/linux-3.16.0/net/wireless/core.c:949 cfg80211_netdev_notifier_call+0x5b9/0x630 [cfg80211]() [19011.797853] Modules linked in: ses enclosure uas usb_storage dm_crypt btusb arc4 dell_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel iwlmvm kvm mac80211 dell_laptop dcdbas crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iwlwifi snd_hda_codec_hdmi joydev snd_hda_codec_idt serio_raw snd_hda_codec_generic bnep cfg80211 lpc_ich dell_smo8800 rfcomm bluetooth 6lowpan_iphc snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me mac_hid shpchp mei soundcore binfmt_misc parport_pc ppdev tpm_rng lp parport btrfs xor raid6_pq hid_generic usbhid hid i915 firewire_ohci i2c_algo_bit sdhci_pci sdhci psmouse firewire_core [19011.797964] ahci e1000e libahci drm_kms_helper drm ptp crc_itu_t pps_core wmi video [19011.797980] CPU: 1 PID: 6870 Comm: kworker/1:1 Not tainted 3.16.0-28-generic #37-Ubuntu [19011.797983] Hardware name: Dell Inc. Latitude E6520/0NVF5K, BIOS A19 11/14/2013 [19011.797999] Workqueue: events cfg80211_rfkill_sync_work [cfg80211] [19011.798003] 0000000000000009 ffff8801b3c47c28 ffffffff81781e6a 0000000000000000 [19011.798008] ffff8801b3c47c60 ffffffff8106fedd ffff88022136a8d0 ffff880035adc260 [19011.798013] 0000000000000002 ffff88022136a000 ffff880035adc000 ffff8801b3c47c70 [19011.798018] Call Trace: [19011.798030] [<ffffffff81781e6a>] dump_stack+0x45/0x56 [19011.798038] [<ffffffff8106fedd>] warn_slowpath_common+0x7d/0xa0 [19011.798044] [<ffffffff8106ffba>] warn_slowpath_null+0x1a/0x20 [19011.798060] [<ffffffffc052f629>] cfg80211_netdev_notifier_call+0x5b9/0x630 [cfg80211] [19011.798068] [<ffffffff8167acab>] ? __dev_remove_pack+0x8b/0xb0 [19011.798075] [<ffffffff81761cbc>] ? __unregister_prot_hook+0xcc/0xd0 [19011.798082] [<ffffffff8109972d>] notifier_call_chain+0x4d/0x70 [19011.798087] [<ffffffff81099856>] raw_notifier_call_chain+0x16/0x20 [19011.798093] [<ffffffff8167b4d5>] call_netdevice_notifiers_info+0x35/0x60 [19011.798099] [<ffffffff8167b878>] dev_close_many+0xc8/0x120 [19011.798105] [<ffffffff8167da46>] dev_close.part.71+0x36/0x50 [19011.798110] [<ffffffff8167da81>] dev_close+0x21/0x30 [19011.798125] [<ffffffffc052e8e5>] cfg80211_shutdown_all_interfaces+0x45/0xc0 [cfg80211] [19011.798140] [<ffffffffc052e98b>] cfg80211_rfkill_sync_work+0x2b/0x40 [cfg80211] [19011.798146] [<ffffffff8108da32>] process_one_work+0x182/0x4e0 [19011.798151] [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0 [19011.798156] [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0 [19011.798162] [<ffffffff81094c6b>] kthread+0xdb/0x100 [19011.798168] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 [19011.798175] [<ffffffff81789dfc>] ret_from_fork+0x7c/0xb0 [19011.798181] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 [19011.798184] ---[ end trace 9074ade8075c79de ]--- [19011.798187] ------------[ cut here ]------------ [19011.798210] WARNING: CPU: 1 PID: 6870 at /build/buildd/linux-3.16.0/net/mac80211/driver-ops.h:12 ieee80211_request_sched_scan_stop+0x155/0x170 [mac80211]() [19011.798213] wlan1: Failed check-sdata-in-driver check, flags: 0x0 [19011.798214] Modules linked in: ses enclosure uas usb_storage dm_crypt btusb arc4 dell_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel iwlmvm kvm mac80211 dell_laptop dcdbas crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iwlwifi snd_hda_codec_hdmi joydev snd_hda_codec_idt serio_raw snd_hda_codec_generic bnep cfg80211 lpc_ich dell_smo8800 rfcomm bluetooth 6lowpan_iphc snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me mac_hid shpchp mei soundcore binfmt_misc parport_pc ppdev tpm_rng lp parport btrfs xor raid6_pq hid_generic usbhid hid i915 firewire_ohci i2c_algo_bit sdhci_pci sdhci psmouse firewire_core [19011.798283] ahci e1000e libahci drm_kms_helper drm ptp crc_itu_t pps_core wmi video [19011.798295] CPU: 1 PID: 6870 Comm: kworker/1:1 Tainted: G W 3.16.0-28-generic #37-Ubuntu [19011.798298] Hardware name: Dell Inc. Latitude E6520/0NVF5K, BIOS A19 11/14/2013 [19011.798312] Workqueue: events cfg80211_rfkill_sync_work [cfg80211] [19011.798314] 0000000000000009 ffff8801b3c47b58 ffffffff81781e6a ffff8801b3c47ba0 [19011.798319] ffff8801b3c47b90 ffffffff8106fedd 0000000000000000 ffff880035adc680 [19011.798326] ffff880035add3b8 00000000fffffffb ffff88022136a8c0 ffff8801b3c47bf0 [19011.798333] Call Trace: [19011.798341] [<ffffffff81781e6a>] dump_stack+0x45/0x56 [19011.798350] [<ffffffff8106fedd>] warn_slowpath_common+0x7d/0xa0 [19011.798357] [<ffffffff8106ff4c>] warn_slowpath_fmt+0x4c/0x50 [19011.798365] [<ffffffff8177e1af>] ? printk+0x63/0x6b [19011.798386] [<ffffffffc06b17d5>] ieee80211_request_sched_scan_stop+0x155/0x170 [mac80211] [19011.798412] [<ffffffffc06c0e4d>] ieee80211_sched_scan_stop+0x2d/0x40 [mac80211] [19011.798440] [<ffffffffc0538e38>] __cfg80211_stop_sched_scan+0x58/0x130 [cfg80211] [19011.798459] [<ffffffffc052f633>] cfg80211_netdev_notifier_call+0x5c3/0x630 [cfg80211] [19011.798465] [<ffffffff8167acab>] ? __dev_remove_pack+0x8b/0xb0 [19011.798471] [<ffffffff81761cbc>] ? __unregister_prot_hook+0xcc/0xd0 [19011.798477] [<ffffffff8109972d>] notifier_call_chain+0x4d/0x70 [19011.798482] [<ffffffff81099856>] raw_notifier_call_chain+0x16/0x20 [19011.798532] [<ffffffff8167b4d5>] call_netdevice_notifiers_info+0x35/0x60 [19011.798551] [<ffffffff8167b878>] dev_close_many+0xc8/0x120 [19011.798558] [<ffffffff8167da46>] dev_close.part.71+0x36/0x50 [19011.798566] [<ffffffff8167da81>] dev_close+0x21/0x30 [19011.798587] [<ffffffffc052e8e5>] cfg80211_shutdown_all_interfaces+0x45/0xc0 [cfg80211] [19011.798607] [<ffffffffc052e98b>] cfg80211_rfkill_sync_work+0x2b/0x40 [cfg80211] [19011.798614] [<ffffffff8108da32>] process_one_work+0x182/0x4e0 [19011.798620] [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0 [19011.798627] [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0 [19011.798634] [<ffffffff81094c6b>] kthread+0xdb/0x100 [19011.798643] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 [19011.798650] [<ffffffff81789dfc>] ret_from_fork+0x7c/0xb0 [19011.798658] [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0 [19011.798663] ---[ end trace 9074ade8075c79df ]--- ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-28-generic 3.16.0-28.37 ProcVersionSignature: Ubuntu 3.16.0-28.37-generic 3.16.7-ckt1 Uname: Linux 3.16.0-28-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bonnaudl 3477 F.... pulseaudio CurrentDesktop: KDE Date: Thu Dec 11 18:55:50 2014 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=cf81afe7-8427-45fa-9149-c11d060a5a26 MachineType: Dell Inc. Latitude E6520 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=749a9901-bdd3-4b5f-b80e-69414667e058 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-28-generic N/A linux-backports-modules-3.16.0-28-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/14/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A19 dmi.board.name: 0NVF5K dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA19:bd11/14/2013:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0NVF5K:rvrA01:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6520 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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