WiFi keeps falling off on average once a week on 16.04 LTS on Lenovo T400

The router is moot. It will obey defacto standards.

What is the output of:

sudo lshw -C network; lsb_release -a; uname -a

Thanks

The output (at the time when WiFi works) is:

$ sudo lshw -C network; lsb_release -a; uname -a
  *-network
       description: Ethernet interface
       product: 82567LM Gigabit Network Connection
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: eth0
       version: 03
       serial: 00:1c:25:9f:cb:c3
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k firmware=1.8-3 latency=0 link=no multicast=yes port=twisted pair
       resources: irq:44 memory:fc000000-fc01ffff memory:fc025000-fc025fff ioport:1840(size=32)
  *-network
       description: Wireless interface
       product: PRO/Wireless 5100 AGN [Shiloh] Network Connection
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 00
       serial: 00:21:6b:ca:bc:32
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-106-generic firmware=8.83.5.1 build 33692 ip=192.168.0.10 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
       resources: irq:48 memory:f4300000-f4301fff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
Linux ThinkPad 3.13.0-106-generic #153-Ubuntu SMP Tue Dec 6 15:44:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Is there any command you would want me to run during the next time when WiFi is not working?

Ok, and the output of:

sudo rfkill list

Thanks

This question was expired because it remained in the 'Needs information' state without activity for the last 15 days.

No, please keep this question open.

Just gone through the agony of disconnected WiFi today. Here is the output:

$ sudo rfkill list
1: phy0: Wireless LAN
 Soft blocked: no
 Hard blocked: no
2: tpacpi_bluetooth_sw: Bluetooth
 Soft blocked: no
 Hard blocked: no
4: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no

Does not seem to show any abnormality.

Can administrator please convert this question into a bug report?

Can anyone please deal with this issue?

Bump

Is there anything in the system logs (dmesg, /var/log/...) around the moment when the connection fails?

Could you let me know which commands should I run and I will provide the output.

The commands to check the system log files are "dmesg" as well as other commands to display the contents of the files in the /var/log directory (e.g. "cat /var/log/syslog")
There is also a program "System log viewer" available.

You have to be aware that the system logs can be huge. It might be too much to copy/paste all system log output into this question document. You should filter for events related to WLAN devices and WLAN drivers.

Salutations!

what is your router security settings? ## I strongly suggest you change your routers security to pure WPA2-PSK with AES (CCMP). No WEP, no WPA/WPA2 mixed mode, and no TKIP. Reboot the router after saving the change.

And you don't seem to be currently running 16.04 LTS!

the output shows your system is:

Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
Linux ThinkPad 3.13.0-106-generic #153-Ubuntu SMP Tue Dec 6 15:44:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

driver=iwlwifi driverversion=3.13.0-106-generic firmware=8.83.5.1

if you upgrade to 16.04 you shall have and updated Intel firmware for the wierless drive iwlwifi.

To upgrade run:

sudo apt update

sudo apt dist-upgrade

sudo do-release-upgrade

## if the wireless keeps dropping after the upgrade to 16.04 ,