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I did a fresh install of Ubuntu 14.04 LTS on the harddisk of a Lenovo Y650 Ideapad laptop. The wireless adapter is an Intel PRO/Wireless 5100 AGN [Shiloh].

Initially I could not connect to any wireless networks; however, I could see them. There are no issues when connecting via Ethernet. I was only able to connect to the wireless network by entering this command in the Terminal:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf

The speeds are extremely slow and intermittent. When I am able to run a speed test, the ping is good (24 to 26 ms) but the download speeds range from 0.15 to 0.30 Mbps.

iwconfig

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11abg  ESSID:"PinkRabbit"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: E8:40:F2:CD:18:0B   
          Bit Rate=2 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-26 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:3  Invalid misc:254   Missed beacon:0

ifconfig

eth0      Link encap:Ethernet  HWaddr 00:23:5a:d2:70:91  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:171 errors:0 dropped:0 overruns:0 frame:0
          TX packets:171 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:15613 (15.6 KB)  TX bytes:15613 (15.6 KB)

wlan0     Link encap:Ethernet  HWaddr 00:1e:65:3e:0c:48  
          inet addr:192.168.0.13  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:65ff:fe3e:c48/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:42 errors:0 dropped:0 overruns:0 frame:0
          TX packets:96 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:9032 (9.0 KB)  TX bytes:16851 (16.8 KB)

nm-tool

NetworkManager Tool

State: connected (global)

- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            tg3
  State:             unavailable
  Default:           no
  HW Address:        00:23:5A:D2:70:91

Capabilities:
    Carrier Detect:  yes

Wired Properties
    Carrier:         off

- Device: wlan0  [PinkRabbit] --------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwlwifi
  State:             connected
  Default:           yes
  HW Address:        00:1E:65:3E:0C:48

  Capabilities:
    Speed:           1 Mb/s

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points (* = current AP)
    *PinkRabbit:     Infra, E8:40:F2:CD:18:0B, Freq 2412 MHz, Rate 54 Mb/s, Strength       92 WPA WPA2

  IPv4 Settings:
    Address:         192.168.0.13
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.0.1

    DNS:             64.71.255.204
    DNS:             64.71.255.198
    DNS:             8.8.8.8
    DNS:             8.8.4.4
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I am facing same issue with my clean install of Ubuntu 14.04 on my new Lenovo L440 laptop. Wifi is not working with driver issue and Ethernet is intermittent. I am clueless on how to proceed! Please let me know if somebody finds some solution –  Venkatesh Jul 24 at 6:09

5 Answers 5

I actually have this problem too, so I look forward to any permanent solution, but one temporary one would be:

sudo iwconfig wlan0 rate 54M

where 54M is your actual wireless capability.

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I've noticed the same issue with my laptop (Intel Wireless 7260 / Lenovo W540). Every few days networking slows to a crawl (includes traffic over all protocols: http, ssh, ftp, etc). I believe I've also experienced the same behavior over eth0, but can't remember.

The workaround for me is to restart network-manager -- that seems to clear out any issues.

jmiranda@jmiranda-ThinkPad-W540:~$ sudo service network-manager restart

lshw

jmiranda@jmiranda-ThinkPad-W540:~$ sudo lshw -C network
  *-network               
       description: Ethernet interface
       product: Ethernet Connection I217-LM
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: eth0
       version: 04
       serial: 3c:97:0e:ea:1b:a4
       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=0.13-3 latency=0 link=no multicast=yes port=twisted pair
       resources: irq:44 memory:b2a00000-b2a1ffff memory:b2a3f000-b2a3ffff ioport:5080(size=32)
  *-network
       description: Wireless interface
       product: Wireless 7260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 6b
       serial: 7c:7a:91:06:7b:e2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-29-generic firmware=22.1.7.0 ip=192.168.1.158 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
       resources: irq:45 memory:b2800000-b2801fff
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I can suggest you to install the Kernel 3.13.0-37_3.13.0-37.64+iwlltr0001 from: http://people.canonical.com/~sforshee/iwl-ltr/trusty/

and the Intel firmware iwlwifi-3160-9-ucode.

After that, I typed in a terminal:

$echo "options iwlmvm power_scheme=1" | sudo tee /etc/modprobe.d/iwlmvm.conf
$echo "options iwlwifi bt_coex_active=Y swcrypto=1 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
$sudo reboot

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Try disabling IPv6: Go to edit network connections, select your connection, go to IPv6 tab, change it to ignore.

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  1. Open "Additional Drivers"
  2. Go to "Other Software" Tab, check all the boxes
  3. Update the driver
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1  
It will help to explain what the proposed solution is supposed to do. Without adding any detail this sounds like a longshot with low change of hitting the target. –  Requist Dec 16 at 19:53
    
Edit your answer and improve it and I will reverse the negative reputation points you've got now. Alternatively, delete your answer and the negative reputation points will be reversed too. –  Fabby Dec 16 at 21:51

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