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[Bug 1497825] Re: Intel Wireless AC 7260 WiFi: no data transfer on Linux with Dlink AP (iwlwifi, iwlmvm)

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>
Date: Fri, 25 Sep 2015 14:22:22 -0000
Reply-to: Bug 1497825 <1497825@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
I don't see any clues in the logs as to what the problem might be.

As for the regulatory domain, the transmit power limit in the 2.4 GHz
range is higher for the US rule than for EC's, so that might help
explain the difference there. It looks like the router must be
broadcasting its location as being in the US.

I have a script you can try to collect more detailed information at
http://people.canonical.com/~sforshee/wifi-debug. To use it:

 1. Download the file.
 2. Run 'sudo bash wifi-debug -t' (it may prompt you to install extra packages).
 3. Connect to the wireless network and verify you're experiencing connection problems.
 4. Press Ctrl-C to terminate the script, and it will generate a wifi-debug-files.tar.gz file in the current directory.

wifi-debug-files.tar.gz might contain private information about your
wireless network, so I recommend you don't attach it to the bug. You can
email me the file or use some other mechanism if you wish. I'd also like
your permission to share this information with engineers at Intel.

Thanks!

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1497825

Title:
  Intel Wireless AC 7260 WiFi: no data transfer on Linux with Dlink AP
  (iwlwifi, iwlmvm)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a problem with a Wireless connection over a Dlink router using an Intel 7260 rev bb chip (802.11ac speed), or rev 0x144 according to iwlwifi. Another access point has worked well, but this one is not working. If I enable an access point on my Android 4.4.2 device Motorola Moto E (Qualcomm Snapdragon 200), it is working, but it is a mobile connection with limited volume.
  On the same PC I have a Windows 7 SP1 64 Bit installation, and am using the full featured Intel driver Wireless_18.11.0_s64.exe. On Windows, I have absolutely no problem with the WiFi connection over Dlink router. Excellent signal strength, and 72 MBit/s speed (WPA2-PSK, AES, 802.11n).
  I am using Linux Mint 17.2 which is based on Ubuntu 14.04.2 LTS and uses a 3.16 kernel. I have installed the Linux firmware update and iwlwifi 7260 firmware 14 additionally to test out some newer kernels from ppa. No kernel works, but here is the table of my experiments, referring to https://wireless.wiki.kernel.org/en/users/Drivers/iwlwifi and 'modinfo iwlwifi':

  Kernel   Documented FW    FW used (modinfo)    FW used (iwlwifi)
  3.16          9                  9
  4.0.9       12                 10
  4.1.7       13                 12
  4.2.0       14                 12               25.30.14.0 op_mode iwlmvm
  4.3.0rc1   14                 12

  On Linux, the signal strength is much lower than on Windows, about 50%. And I get no data transfer, DNS resolution already fails. The connection seems to be established.
  I hope that the functionality of the Windows driver can be transferred to Linux, because it works so well. But it is quite new, from August 2015.
  I have seen new uploads for linux-firmware, until firmware 16. Is there a kernel or driver to test it? I could compile it and give a feedback.

  I have used the WiFi connection in Germany with an AVM 7490 router
  successfully, and am now in Ecuador. All tests have been done in
  Ecuador. Setting the regulatory domain to the correct value with "sudo
  iw reg set EC" leads to repeated disconnects, so I assume "US" is
  working better, it is automatically set according to dmesg dump.

  Here is a filtered dmesg dump of the 4.2.0 kernel test:

  [    5.868916] iwlwifi 0000:06:00.0: Direct firmware load for iwlwifi-7260-15.ucode failed with error -2
  [    5.879942] iwlwifi 0000:06:00.0: loaded firmware version 25.30.14.0 op_mode iwlmvm
  [    5.911923] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
  [    5.911976] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  [    5.912202] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  [    5.934333] cfg80211: World regulatory domain updated:
  [    5.934336] cfg80211:  DFS Master region: unset
  [    5.934337] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [    5.934339] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [    5.934341] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [    5.934342] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  [    5.934343] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [    5.934345] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [    6.141534] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
  [    6.493114] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  [    6.493365] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  [    6.699109] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  [    6.699355] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  [    6.711736] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
  [   10.159730] wlan0: authenticate with c0:a0:bb:13:a9:fa
  [   10.164836] wlan0: send auth to c0:a0:bb:13:a9:fa (try 1/3)
  [   10.166982] wlan0: authenticated
  [   10.169284] wlan0: associate with c0:a0:bb:13:a9:fa (try 1/3)
  [   10.176401] wlan0: RX AssocResp from c0:a0:bb:13:a9:fa (capab=0xc11 status=0 aid=4)
  [   10.177185] wlan0: associated
  [   10.177207] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
  [   10.178740] cfg80211: Regulatory domain changed to country: US
  [   10.178743] cfg80211:  DFS Master region: unset
  [   10.178744] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [   10.178745] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm), (N/A)
  [   10.178747] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm), (N/A)
  [   10.178747] cfg80211:   (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (0 s)
  [   10.178748] cfg80211:   (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (0 s)
  [   10.178749] cfg80211:   (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (0 s)
  [   10.178750] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm), (N/A)
  [   10.178751] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)

  And here a filtered syslog of the 4.2.0 kernel test:

  kernel: [    5.950999] Bluetooth: Core ver 2.20
  kernel: [    5.951011] NET: Registered protocol family 31
  kernel: [    5.951012] Bluetooth: HCI device and connection manager initialized
  kernel: [    5.951015] Bluetooth: HCI socket layer initialized
  kernel: [    5.951018] Bluetooth: L2CAP socket layer initialized
  kernel: [    5.951022] Bluetooth: SCO socket layer initialized
  kernel: [    5.972903] Intel(R) Wireless WiFi driver for Linux
  kernel: [    5.972906] Copyright(c) 2003- 2015 Intel Corporation
  kernel: [    5.981224] iwlwifi 0000:06:00.0: Direct firmware load for iwlwifi-7260-15.ucode failed with error -2
  kernel: [    5.981390] AVX2 version of gcm_enc/dec engaged.
  kernel: [    5.981391] AES CTR mode by8 optimization enabled
  kernel: [    5.986901] iwlwifi 0000:06:00.0: loaded firmware version 25.30.14.0 op_mode iwlmvm
  kernel: [    6.006817] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
  kernel: [    6.006869] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  kernel: [    6.007094] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  kernel: [    6.057082] intel_rapl: Found RAPL domain package
  kernel: [    6.057085] intel_rapl: Found RAPL domain core
  kernel: [    6.057087] intel_rapl: Found RAPL domain uncore
  kernel: [    6.057089] intel_rapl: Found RAPL domain dram
  kernel: [    6.073295] cfg80211: World regulatory domain updated:
  kernel: [    6.073305] cfg80211:  DFS Master region: unset
  kernel: [    6.073306] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  kernel: [    6.073308] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  kernel: [    6.073310] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  kernel: [    6.073311] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  kernel: [    6.073313] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  kernel: [    6.073314] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  kernel: [    6.094413] init: Failed to obtain startpar-bridge instance: Unknown parameter: INSTANCE
  kernel: [    6.244175] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
  kernel: [    6.268966] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  kernel: [    6.268968] Bluetooth: BNEP filters: protocol multicast
  kernel: [    6.268972] Bluetooth: BNEP socket layer initialized
  kernel: [    6.298862] Bluetooth: RFCOMM TTY layer initialized
  kernel: [    6.298867] Bluetooth: RFCOMM socket layer initialized
  kernel: [    6.298871] Bluetooth: RFCOMM ver 1.11
  avahi-daemon[1395]: Network interface enumeration completed.
  avahi-daemon[1395]: Registering HINFO record with values 'X86_64'/'LINUX'.
  NetworkManager[1381]: <info> monitoring kernel firmware directory '/lib/firmware'.
  NetworkManager[1381]: <info> rfkill1: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.3/0000:06:00.0/ieee80211/phy0/rfkill1) (driver iwlwifi)
  NetworkManager[1381]: <info> WiFi enabled by radio killswitch; enabled by state file
  NetworkManager[1381]: <info> WWAN enabled by radio killswitch; enabled by state file
  NetworkManager[1381]: <info> WiMAX enabled by radio killswitch; enabled by state file
  NetworkManager[1381]: <info> Networking is enabled by state file
  NetworkManager[1381]: <warn> failed to allocate link cache: (-12) Object not found
  NetworkManager[1381]: <info> (eth0): carrier is OFF
  NetworkManager[1381]: <info> (eth0): new Ethernet device (driver: 'r8169' ifindex: 2)
  NetworkManager[1381]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
  NetworkManager[1381]: <info> (eth0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
  NetworkManager[1381]: <info> (eth0): bringing up device.
  ntpdate[1749]: Can't find host ntp.ubuntu.com: Name or service not known (-2)
  ntpdate[1749]: no servers can be used, exiting
  NetworkManager[1381]: <info> (eth0): preparing device.
  NetworkManager[1381]: <info> (eth0): deactivating device (reason 'managed') [2]
  NetworkManager[1381]: <info> Added default wired connection 'Wired connection 1' for /sys/devices/pci0000:00/0000:00:1c.2/0000:05:00.2/net/eth0
  kernel: [    6.680688] r8169 0000:05:00.2 eth0: link down
  kernel: [    6.680722] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
  NetworkManager[1381]: <info> (wlan0): using nl80211 for WiFi device control
  NetworkManager[1381]: <info> (wlan0): driver supports Access Point (AP) mode
  NetworkManager[1381]: <info> (wlan0): new 802.11 WiFi device (driver: 'iwlwifi' ifindex: 3)
  NetworkManager[1381]: <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/1
  NetworkManager[1381]: <info> (wlan0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
  NetworkManager[1381]: <info> (wlan0): bringing up device.
  kernel: [    6.682888] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  kernel: [    6.683113] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  kernel: [    6.902341] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  kernel: [    6.902590] iwlwifi 0000:06:00.0: L1 Disabled - LTR Disabled
  NetworkManager[1381]: <info> (wlan0): preparing device.
  NetworkManager[1381]: <info> (wlan0): deactivating device (reason 'managed') [2]
  dbus[1211]: [system] Activating service name='fi.w1.wpa_supplicant1' (using servicehelper)
  NetworkManager[1381]: <warn> /sys/devices/virtual/net/lo: couldn't determine device driver; ignoring...
  NetworkManager[1381]: <warn> /sys/devices/virtual/net/lo: couldn't determine device driver; ignoring...
  NetworkManager[1381]: <info> urfkill disappeared from the bus
  kernel: [    6.915412] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
  NetworkManager[1381]: <info> ModemManager available in the bus
  dbus[1211]: [system] Successfully activated service 'fi.w1.wpa_supplicant1'
  NetworkManager[1381]: <info> wpa_supplicant started
  wpa_supplicant[2331]: Successfully initialized wpa_supplicant
  acpid: starting up with netlink and the input layer
  acpid: 9 rules loaded
  acpid: waiting for events: event logging is off
  NetworkManager[1381]: <info> (wlan0) supports 5 scan SSIDs
  NetworkManager[1381]: <warn> Trying to remove a non-existant call id.
  NetworkManager[1381]: <info> (wlan0): supplicant interface state: starting -> ready
  NetworkManager[1381]: <info> (wlan0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
  NetworkManager[1381]: <info> (wlan0): supplicant interface state: ready -> disconnected
  NetworkManager[1381]: <info> (wlan0) supports 5 scan SSIDs
  wpa_supplicant[2352]: wlan0: Reject scan trigger since one is already pending
  wpa_supplicant[2352]: wlan0: CTRL-EVENT-SCAN-STARTED 
  kernel: [    7.970104] Bluetooth: hci0 command 0x0c03 tx timeout
  ModemManager[1279]: <warn>  Couldn't find support for device at '/sys/devices/pci0000:00/0000:00:1c.2/0000:05:00.2': not supported by any plugin
  ModemManager[1279]: <warn>  Couldn't find support for device at '/sys/devices/pci0000:00/0000:00:1c.3/0000:06:00.0': not supported by any plugin
  NetworkManager[1381]: <info> Auto-activating connection 'Auto dlink-ap'.
  NetworkManager[1381]: <info> Activation (wlan0) starting connection 'Auto dlink-ap'
  NetworkManager[1381]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  NetworkManager[1381]: <info> NetworkManager state is now CONNECTING
  NetworkManager[1381]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
  NetworkManager[1381]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
  NetworkManager[1381]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
  NetworkManager[1381]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
  NetworkManager[1381]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
  NetworkManager[1381]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
  NetworkManager[1381]: <info> Activation (wlan0/wireless): connection 'Auto dlink-ap' has security, and secrets exist.  No new secrets needed.
  NetworkManager[1381]: <info> Config: added 'ssid' value 'dlink-ap'
  NetworkManager[1381]: <info> Config: added 'scan_ssid' value '1'
  NetworkManager[1381]: <info> Config: added 'key_mgmt' value 'WPA-PSK'
  NetworkManager[1381]: <info> Config: added 'psk' value '<omitted>'
  NetworkManager[1381]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
  NetworkManager[1381]: <info> Config: set interface ap_scan to 1
  NetworkManager[1381]: <info> (wlan0): supplicant interface state: disconnected -> inactive
  wpa_supplicant[2352]: wlan0: SME: Trying to authenticate with c0:a0:bb:14:aa:32 (SSID='dlink-ap' freq=2412 MHz)
  kernel: [   10.356555] wlan0: authenticate with c0:a0:bb:14:aa:32
  wpa_supplicant[2352]: wlan0: Trying to associate with c0:a0:bb:14:aa:32 (SSID='dlink-ap' freq=2412 MHz)
  NetworkManager[1381]: <info> (wlan0): supplicant interface state: inactive -> associating
  kernel: [   10.359375] wlan0: send auth to c0:a0:bb:14:aa:32 (try 1/3)
  kernel: [   10.361139] wlan0: authenticated
  kernel: [   10.362657] wlan0: associate with c0:a0:bb:14:aa:32 (try 1/3)
  wpa_supplicant[2352]: wlan0: Associated with c0:a0:bb:14:aa:32
  kernel: [   10.366885] wlan0: RX AssocResp from c0:a0:bb:14:aa:32 (capab=0xc11 status=0 aid=4)
  kernel: [   10.368950] wlan0: associated
  kernel: [   10.368974] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
  kernel: [   10.370544] cfg80211: Regulatory domain changed to country: US
  kernel: [   10.370547] cfg80211:  DFS Master region: unset
  kernel: [   10.370548] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  kernel: [   10.370549] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm), (N/A)
  kernel: [   10.370551] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm), (N/A)
  kernel: [   10.370552] cfg80211:   (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (0 s)
  kernel: [   10.370553] cfg80211:   (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (0 s)
  kernel: [   10.370554] cfg80211:   (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (0 s)
  kernel: [   10.370555] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm), (N/A)
  kernel: [   10.370556] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
  NetworkManager[1381]: <info> (wlan0): supplicant interface state: associating -> 4-way handshake
  wpa_supplicant[2352]: wlan0: WPA: Key negotiation completed with c0:a0:bb:14:aa:32 [PTK=CCMP GTK=TKIP]
  wpa_supplicant[2352]: wlan0: CTRL-EVENT-CONNECTED - Connection to c0:a0:bb:14:aa:32 completed [id=0 id_str=]
  NetworkManager[1381]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed
  NetworkManager[1381]: <info> Activation (wlan0/wireless) Stage 2 of 5 (Device Configure) successful.  Connected to wireless network 'dlink-ap'.
  NetworkManager[1381]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) scheduled.
  NetworkManager[1381]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) started...
  NetworkManager[1381]: <info> (wlan0): device state change: config -> ip-config (reason 'none') [50 70 0]
  NetworkManager[1381]: <info> Activation (wlan0) Beginning DHCPv4 transaction (timeout in 45 seconds)
  NetworkManager[1381]: <info> dhclient started with pid 2481
  NetworkManager[1381]: <info> Activation (wlan0) Beginning IP6 addrconf.
  NetworkManager[1381]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) complete.
  dhclient: Internet Systems Consortium DHCP Client 4.2.4
  NetworkManager[1381]: <info> (wlan0): DHCPv4 state changed nbi -> preinit
  dhclient: Listening on LPF/wlan0/48:51:b7:18:45:34
  dhclient: Sending on   LPF/wlan0/48:51:b7:18:45:34
  dhclient: Sending on   Socket/fallback
  dhclient: DHCPREQUEST of 192.168.0.112 on wlan0 to 255.255.255.255 port 67 (xid=0x243b622e)
  kernel: [   10.989573] init: plymouth-stop pre-start process (2484) terminated with status 1
  avahi-daemon[1395]: Joining mDNS multicast group on interface wlan0.IPv6 with address fe80::4a51:b7ff:fe15:78b3.
  avahi-daemon[1395]: New relevant interface wlan0.IPv6 for mDNS.
  avahi-daemon[1395]: Registering new address record for fe80::4a51:b7ff:fe15:78b3 on wlan0.*.
  dhclient: DHCPREQUEST of 192.168.0.112 on wlan0 to 255.255.255.255 port 67 (xid=0x243b622e)
  dhclient: DHCPACK of 192.168.0.112 from 192.168.0.1
  dhclient: bound to 192.168.0.112 -- renewal in 230966 seconds.
  NetworkManager[1381]: <info> (wlan0): DHCPv4 state changed preinit -> reboot
  NetworkManager[1381]: <info>   address 192.168.0.112
  NetworkManager[1381]: <info>   prefix 24 (255.255.255.0)
  NetworkManager[1381]: <info>   gateway 192.168.0.1
  NetworkManager[1381]: <info>   nameserver '192.168.0.1'
  NetworkManager[1381]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
  NetworkManager[1381]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) started...
  avahi-daemon[1395]: Joining mDNS multicast group on interface wlan0.IPv4 with address 192.168.0.112.
  avahi-daemon[1395]: New relevant interface wlan0.IPv4 for mDNS.
  avahi-daemon[1395]: Registering new address record for 192.168.0.112 on wlan0.IPv4.
  NetworkManager[1381]: <info> (wlan0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
  NetworkManager[1381]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) complete.
  NetworkManager[1381]: <info> (wlan0): device state change: secondaries -> activated (reason 'none') [90 100 0]
  NetworkManager[1381]: <info> NetworkManager state is now CONNECTED_GLOBAL
  NetworkManager[1381]: <info> Policy set 'Auto dlink-ap' (wlan0) as default for IPv4 routing and DNS.
  NetworkManager[1381]: <info> DNS: starting dnsmasq...
  NetworkManager[1381]: <warn> dnsmasq not available on the bus, can't update servers.
  NetworkManager[1381]: <error> [1442802760.34388] [nm-dns-dnsmasq.c:396] update(): dnsmasq owner not found on bus: Could not get owner of name 'org.freedesktop.NetworkManager.dnsmasq': no such name
  NetworkManager[1381]: <warn> DNS: plugin dnsmasq update failed
  NetworkManager[1381]: <info> Writing DNS information to /sbin/resolvconf
  dnsmasq[3009]: started, version 2.68 cache disabled
  dnsmasq[3009]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth
  dnsmasq[3009]: DBus support enabled: connected to system bus
  dnsmasq[3009]: warning: no upstream servers configured
  kernel: [   15.967945] Bluetooth: hci0 sending initial HCI reset command failed (-110)
  NetworkManager[1381]: <info> Activation (wlan0) successful, device activated.
  dbus[1211]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
  NetworkManager[1381]: <info> WiFi hardware radio set enabled
  NetworkManager[1381]: <warn> dnsmasq appeared on DBus: :1.39
  NetworkManager[1381]: <info> Writing DNS information to /sbin/resolvconf
  dnsmasq[3009]: setting upstream servers from DBus
  dnsmasq[3009]: using nameserver 192.168.0.1#53
  NetworkManager[1381]: <info> (wlan0): IP6 addrconf timed out or failed.
  NetworkManager[1381]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
  wpa_supplicant[2352]: wlan0: CTRL-EVENT-SCAN-STARTED 
  NetworkManager[1381]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started...
  NetworkManager[1381]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
  ntpdate[3151]: Can't find host ntp.ubuntu.com: Name or service not known (-2)
  ntpdate[3151]: no servers can be used, exiting
  --- 
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ah         2756 F.... pulseaudio
   /dev/snd/controlC0:  ah         2756 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-12-27 (269 days ago)
  InstallationMedia: Linux Mint 17.1 "Rebecca" - Release amd64 20141126
  MachineType: Notebook P15SM-A/SM1-A
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-38-generic root=UUID=12f37da9-2e20-4fc0-b02b-3f1c4b171e7f ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-38-generic N/A
   linux-backports-modules-3.16.0-38-generic  N/A
   linux-firmware                             1.127.15
  Tags:  rafaela
  Uname: Linux 3.16.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/14/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: P15SM-A/SM1-A
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd11/14/2014:svnNotebook:pnP15SM-A/SM1-A:pvrNotApplicable:rvnNotebook:rnP15SM-A/SM1-A:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: P15SM-A/SM1-A
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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References

[Bug 1497825] [NEW] Intel Wireless AC 7260 WiFi: no data transfer on Linux with Dlink AP (iwlwifi, iwlmvm)
From: andrehe, 2015-09-21