Every once in a while wifi icon turns to question mark and connectivity is lost

Asked by Slavic Dragovtev on 2018-05-12

I'll post this here as a question, before someone who knows what package this can be filed as a bug against can convert it to a bug report.

With a frequency of several times a day, wifi connection is lost and the icon in the Gnome applet turns to an interrogation sign. Nothing which seemed relevant in the syslog for now. Perhaps I am missing something.

Ubuntu 18.04

==================
 uname -a
Linux slavic-probook 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

==================
lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 02)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
=================

Question information

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Last query:
2018-05-13
Last reply:
2018-05-13
Slavic Dragovtev (slavicd) said : #1

I now have to add that:

This "answers" platform does not allow one to upload a file as an illustration to a problem. Good job, Canonical, leading Linux distributor. And don't tell me that it's not a place for frustration, because it is. If free and open software is to become something we have to do more than this.

In the meanwhile here's a picture of what I mean, on an external platform that does NOT guarantee that the file will be accessible one year from now: https://ibb.co/mZS5Vd

Have you rebooted your router?

This is a text only service so using imageshack / Dropbox public etc is normal

Slavic Dragovtev (slavicd) said : #4

Router is not the issue (since I have 5 other machines that are not experiencing the issue simultaneously). ICMP pings don't go through. Happens with card power management disabled (for session) too.

And actionparsnip, yes - the power cord is plugged.

I recommend you reboot it. The router is a computer so isn't infallible. Power off for 30 seconds then back on.

What is the output of:

sudo lshw -C network

Thanks

Slavic Dragovtev (slavicd) said : #7

I assume you are interested in the output of lshw while the problem is occuring.

In normal cases this is the output:
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: enp1s0
       version: 15
       serial: c8:d3:ff:d6:23:da
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:128 ioport:3000(size=256) memory:ceb04000-ceb04fff memory:ceb00000-ceb03fff
  *-network
       description: Wireless interface
       product: Wireless 7265
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0
       version: 59
       serial: d0:57:7b:60:3a:6a
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-20-generic firmware=29.610311.0 ip=192.168.1.67 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:131 memory:cea00000-cea01fff

And, again, it's not the router. The router has been restarted numerous times. Performing service network-manager restart solves the problem. Just like turning on and off the wifi connection.

Try:

sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=1

Is the WiFi better? If so then we can make it stick. Also make sure you have the latest BIOS.

Can you help with this problem?

Provide an answer of your own, or ask Slavic Dragovtev for more information if necessary.

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