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I've been having a problem with the wireless network not reconnecting after sleep for the last few versions of Ubuntu, with the latest being 16.04 LTS.

Here are the laptop specifications:

  • Lenovo Thinkpad X230 Tablet (often X230t)
  • Ubuntu 16.04.1 LTS 64-bit
  • Intel® Core™ i5-3320M CPU @ 2.60GHz × 4
  • Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
  • Default Ubuntu wireless driver (iwlwifi)

Additional details from modinfo:

$ modinfo iwlwifi | grep -v 'pci:' | grep -v 'iwlwifi-'
filename:       /lib/modules/4.4.0-34-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
license:        GPL
author:         Copyright(c) 2003- 2015 Intel Corporation <ilw@linux.intel.com>
description:    Intel(R) Wireless WiFi driver for Linux
srcversion:     651BF6CBF283F6F817B8F3A
depends:        cfg80211
intree:         Y
vermagic:       4.4.0-34-generic SMP mod_unload modversions 
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           antenna_coupling:specify antenna coupling in dB (default: 0 dB) (int)
parm:           nvm_file:NVM file name (charp)
parm:           d0i3_disable:disable d0i3 functionality (default: Y) (bool)
parm:           lar_disable:disable LAR functionality (default: N) (bool)
parm:           uapsd_disable:disable U-APSD functionality (default: Y) (bool)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)
parm:           fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)

Let me know if you need any more specs.

To replicate the issue:

  1. Turn on or reboot laptop.
  2. Put laptop to sleep
  3. After a few minutes, turn laptop back on
  4. No wireless connection is possible

I have tried the solutions outlined on this page, but they do not work consistently.

Wireless networking not working after resume in Ubuntu 14.04

Specifically I have this modification applied:

$ cat /etc/pm/sleep.d/10_resume_wifi 
#!/bin/sh

case "${1}" in
  resume|thaw)
    nmcli radio wifi off && nmcli radio wifi on;
esac

It works probably half of the time. Since the prior post is specific to Ubuntu 14.04, many things have probably changed since solutions were suggested that invalidate those solutions.

Chris S.
  • 323

0 Answers0