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M3800 Developer Edition: wifi doesn't work after sleep

I have an M3800 Developer Edition (2015 model). Ubuntu is factory-installed 14.04, with hardware enablement stack installed. Recently (past 1-2 weeks) wifi doesn't work after sleep (lid closed or open doesn't matter), and only rebooting gets in back. Tried rmmod and modprobe with no success. Has anyone else seen this, and/or are you aware of any open bug(s) for this?

Relevant ouput:

lsmod when problem exists:
iwlmvm                217725  0
mac80211              652718  1 iwlmvm
iwlwifi               179412  1 iwlmvm
cfg80211              494362  3 iwlwifi,mac80211,iwlmvm

rfkill list when problem exists:
1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
3: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

rmmod the above, then modprobe iwlwifi. Does not fix problem, only rebooting does:
May  4 08:23:14 jonathan-m3800 kernel: [69089.189614] cfg80211: Calling CRDA to update world regulatory domain
May  4 08:23:14 jonathan-m3800 kernel: [69089.192181] cfg80211: World regulatory domain updated:
May  4 08:23:14 jonathan-m3800 kernel: [69089.192184] cfg80211:  DFS Master region: unset
May  4 08:23:14 jonathan-m3800 kernel: [69089.192185] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
May  4 08:23:14 jonathan-m3800 kernel: [69089.192187] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
May  4 08:23:14 jonathan-m3800 kernel: [69089.192188] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
May  4 08:23:14 jonathan-m3800 kernel: [69089.192189] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
May  4 08:23:14 jonathan-m3800 kernel: [69089.192190] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
May  4 08:23:14 jonathan-m3800 kernel: [69089.192191] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
May  4 08:23:14 jonathan-m3800 kernel: [69089.204141] Intel(R) Wireless WiFi driver for Linux, in-tree:
May  4 08:23:14 jonathan-m3800 kernel: [69089.204143] Copyright(c) 2003- 2014 Intel Corporation
May  4 08:23:14 jonathan-m3800 kernel: [69089.204414] iwlwifi 0000:06:00.0: irq 48 for MSI/MSI-X
May  4 08:23:14 jonathan-m3800 kernel: [69089.204904] iwlwifi 0000:06:00.0: loaded firmware version 25.228.9.0 op_mode iwlmvm
May  4 08:23:14 jonathan-m3800 kernel: [69089.207709] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
May  4 08:23:14 jonathan-m3800 kernel: [69089.207790] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled
May  4 08:23:14 jonathan-m3800 kernel: [69089.208150] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled
May  4 08:23:14 jonathan-m3800 kernel: [69089.392408] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
May  4 08:23:14 jonathan-m3800 NetworkManager[901]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1c.2/0000:06:00.0/net/wlan0, iface: wlan0)
May  4 08:23:14 jonathan-m3800 NetworkManager[901]:    SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1c.2/0000:06:00.0/net/wlan0, iface: wlan0): no ifupdown configuration found.
May  4 08:23:14 jonathan-m3800 NetworkManager[901]: <info> (wlan0): using nl80211 for WiFi device control
May  4 08:23:14 jonathan-m3800 NetworkManager[901]: <info> (wlan0): driver supports Access Point (AP) mode
May  4 08:23:14 jonathan-m3800 NetworkManager[901]: <info> (wlan0): new 802.11 WiFi device (driver: 'iwlwifi' ifindex: 4)
May  4 08:23:14 jonathan-m3800 NetworkManager[901]: <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/2
May  4 08:23:14 jonathan-m3800 NetworkManager[901]: <info> rfkill5: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.2/0000:06:00.0/ieee80211/phy0/rfkill5) (driver iwlwifi)
May  4 08:23:16 jonathan-m3800 ModemManager[852]: <warn>  Couldn't find support for device at '/sys/devices/pci0000:00/0000:00:1c.2/0000:06:00.0': not supported by any plugin

lspci:

06:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b)

After reboot:
lsmod |grep -i iwl:
iwlmvm                217725  0
mac80211              652718  1 iwlmvm
iwlwifi               179412  1 iwlmvm
cfg80211              494362  3 iwlwifi,mac80211,iwlmvm

rfkill list after reboot:
0: nfc0: NFC
        Soft blocked: no
        Hard blocked: no
1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
2: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

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2 Replies
Anonymous
Thallium

RE: M3800 Developer Edition: wifi doesn't work after sleep

www.dell.com/.../EN maybe you can help

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Anonymous
Thallium

RE: M3800 Developer Edition: wifi doesn't work after sleep

maybe you can help www.dell.com/.../EN

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