No WiFi on Thinkpad T410

[GreyGeek]

My next step would be to reinstall the KDE desktop.
apt-get install --reinstall kubuntu-desktop

[makelix]

Ran the commands, no problems.

[GreyGeek]

19 minutes.

The crash may have corrupted some files. Issue the following two command in a Konsole until they return nothing.

sudo apt-get -f install
sudo dpkg --configure -a

[makelix]

Well, that was annoyingly fast. Just had a total system crash, and after rebooting the WiFi doesn't work any more. Tried all the tricks above already.

[makelix]

I got the WiFi to connect by adding the following line to /etc/modprobe.d/iwlwifi.conf:

options iwlwifi power_save=0

I'm going to keep this thread open for a couple of days in case the problem returns, if that's okay? I found this solution over at Ubuntu Forums:
https://ubuntuforums.org/showthread.php?t=2339439

[makelix]

I disabled all extra network stuff from the BIOS: Bluetooth, Wimax and modem. Didn't make a difference.

[makelix]

Is your BlueTooth interfering with your wifi?

Anyway, try:
sudo killall wpa_supplicant

"sudo killall wpa_supplicant" disconnects the WiFi, or rather whatever there is left of it. Network manager applet shows no access points etc. Running "sudo systemctl restart NetworkManager" brings wpa_supplicant back up. The access points become visible but the WiFi still doesn't work.

No idea about the Bluetooth. I don't think I have ever even tried that with this laptop.

[GreyGeek]

[iwlwifi]
filename:       /lib/modules/4.8.0-22-generic/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license:        GPL
author:         Copyright(c) 2003- 2015 Intel Corporation <linuxwifi@intel.com>
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-IWL6000G2B_UCODE_API_MAX.ucode
firmware:       iwlwifi-6000g2a-6.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-6.ucode
firmware:       iwlwifi-7265D-24.ucode
firmware:       iwlwifi-7265-17.ucode
firmware:       iwlwifi-3168-24.ucode
firmware:       iwlwifi-3160-17.ucode
firmware:       iwlwifi-7260-17.ucode
firmware:       iwlwifi-8265-24.ucode
firmware:       iwlwifi-8000C--24.ucode
firmware:       iwlwifi-9260-th-a0-lc-a0--24.ucode
firmware:       iwlwifi-9260-th-a0-jf-a0--24.ucode
firmware:       iwlwifi-9000-pu-a0-lc-a0--24.ucode
firmware:       iwlwifi-Qu-a0-jf-b0--24.ucode
srcversion:     5916491CB41B355C975C3F8
depends:        cfg80211
intree:         Y
vermagic:       4.8.0-22-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:amsdu size 0: 12K for multi Rx queue devices, 4K for other devices 1:4K 2:8K 3:12K (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 bitmap 1: BSS 2: P2P Client (default: 3) (uint)
[B]parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)[/B]
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)
parm:           d0i3_timeout:Timeout to D0i3 entry when idle (ms) (uint)
parm:           disable_11ac:Disable VHT capabilities (default: false) (bool)

Is your BlueTooth interfering with your wifi?

Anyway, try:
sudo killall wpa_supplicant

[makelix]

I had problems with WiFi on 16.04 and did a clean install of 16.10 on a different drive hoping that the newer version would fix the problem. However, it seems that my WiFi works even worse on 16.10. I can't get the connection to stay up for more than a couple of seconds (eight pings is the best so far before the traffic stopped). I have tried

• disconnecting and reconnecting
• turning WiFi off and on with the network management applet
• turning WiFi off and on with the "soft button"
• turning Wifi off and on with the "hard button"
• turning the computer off and then restarting
• doing "sudo systemctl restart NetworkManager"

After doing any of the above, a ping or two might go through but then nothing. On 16.04 the WiFi usually started working sooner or later with one of those steps, althought there was one case when I fiddled with the WiFi for 30 minutes and it still didn't start.
wireless-info.zip