View Full Version : [ubuntu] Wifi drops out but says connected on Intel 5100 in 12.04.1 LTS

January 16th, 2013, 05:17 AM
I am running 12.04.1 LTS off of a bootable USB drive with 4GB persistent file system. On a fresh install the wireless will work as soon as I enter the password. After some time (sometimes a while 45+ minutes and sometimes just a few minutes) the connection will no longer work. The connection info will show no difference between it working and not.
After a reboot, the connection info will say that it is connected, but the connection is in fact not working.

I've found a similar issue in these forums that recommend the following series of commands:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifiThis series of commands will consistently get my connection working once per boot (if this got the connection working again, but then it drops out another time, re-entering the commands does not seem to consistently work a second time and I need to reboot).

1 Dell studio 1555 laptop
2 Intel Corp Wifi Link 5100
3 ifconfig :
Link encap:Ethernet HWaddr 00:22:fb:a6:fb:94
inet addr: Bcast: Mask:
inet6 addr: fe80::222:fbff:fea6:fb94/64 Scope:Link
RX packets:54 errors:0 dropped:0 overruns:0 frame:0
TX packets:259 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5114 (5.1 KB) TX bytes:31459 (31.4 KB)iwconfig:
wlan1 IEEE 802.11abg ESSID:"HOME-BB62"
Mode:Managed Frequency:2.437 GHz Access Point: 00:1D:D1:35:BB:60
Bit Rate=54 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=68/70 Signal level=-42 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:04 lsmod:
Module Size Used by
dm_crypt 22528 0
arc4 12473 2
snd_hda_codec_hdmi 31775 1
iwlwifi 291907 0
snd_hda_codec_idt 60251 1
snd_hda_intel 32765 5
snd_hda_codec 109562 3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep 13276 1 snd_hda_codec
mac80211 436455 1 iwlwifi
snd_pcm 80845 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi 13132 0
snd_rawmidi 25424 1 snd_seq_midi
r852 17901 0
cfg80211 178679 2 iwlwifi,mac80211
sm_common 16737 1 r852
snd_seq_midi_event 14475 1 snd_seq_midi
nand 49667 2 r852,sm_common
snd_seq 51567 2 snd_seq_midi,snd_seq_midi_event
nand_ids 8547 1 nand
snd_timer 28931 2 snd_pcm,snd_seq
snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq
mtd 35584 2 sm_common,nand
nand_bch 13003 1 nand
bch 21757 1 nand_bch
snd 62064 20 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel ,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_s eq,snd_timer,snd_seq_device
nand_ecc 13070 1 nand
uvcvideo 67203 0
r592 17808 0
soundcore 14635 1 snd
btusb 17912 2
snd_page_alloc 14108 2 snd_hda_intel,snd_pcm
memstick 15857 1 r592
videodev 86588 1 uvcvideo
psmouse 72919 0
joydev 17393 0
parport_pc 32114 0
dell_wmi 12601 0
dell_laptop 17767 0
mac_hid 13077 0
ppdev 12849 0
serio_raw 13027 0
sparse_keymap 13658 1 dell_wmi
bnep 17830 2
dcdbas 14098 1 dell_laptop
rfcomm 38139 12
lp 17455 0
parport 40930 3 parport_pc,ppdev,lp
bluetooth 158438 23 btusb,bnep,rfcomm
dm_multipath 22710 0
ext2 67987 1
squashfs 36095 1
overlayfs 27511 1
nls_iso8859_1 12617 1
nls_cp437 12751 1
vfat 17308 1
fat 55605 1 vfat
dm_raid45 76451 0
xor 25987 1 dm_raid45
dm_mirror 21822 0
dm_region_hash 16065 1 dm_mirror
dm_log 18193 3 dm_raid45,dm_mirror,dm_region_hash
btrfs 638208 0
zlib_deflate 26622 1 btrfs
libcrc32c 12543 1 btrfs
usbhid 41906 0
hid 77367 1 usbhid
radeon 737789 3
firewire_ohci 40172 0
sdhci_pci 18324 0
sdhci 28241 1 sdhci_pci
firewire_core 56906 1 firewire_ohci
crc_itu_t 12627 1 firewire_core
ttm 65344 1 radeon
tg3 141369 0
drm_kms_helper 45466 1 radeon
drm 197692 5 radeon,ttm,drm_kms_helper
usb_storage 39646 1
wmi 18744 1 dell_wmi
video 19068 0
i2c_algo_bit 13199 1 radeon
5 dmesg | grep wlan1:
[ 67.486042] udevd[2575]: renamed network interface wlan0 to wlan1
[ 67.667008] ADDRCONF(NETDEV_UP): wlan1: link is not ready
[ 67.667261] ADDRCONF(NETDEV_UP): wlan1: link is not ready
[ 77.547260] wlan1: authenticate with 00:1d:d1:35:bb:60 (try 1)
[ 77.549910] wlan1: authenticated
[ 77.554667] wlan1: associate with 00:1d:d1:35:bb:60 (try 1)
[ 77.561236] wlan1: RX AssocResp from 00:1d:d1:35:bb:60 (capab=0xc11 status=0 aid=1)
[ 77.561240] wlan1: associated
[ 77.566193] ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[ 88.240021] wlan1: no IPv6 routers present6 sudo lshw -C network:
description: Wireless interface
product: WiFi Link 5100
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:04:00.0
logical name: wlan1
version: 00
serial: 00:22:fb:a6:fb:94
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-29-generic-pae firmware= build 33692 ip= latency=0 link=yes multicast=yes wireless=IEEE 802.11abg
resources: irq:49 memory:f8000000-f8001fff
description: Ethernet interface
product: NetLink BCM5784M Gigabit Ethernet PCIe
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:08:00.0
logical name: eth0
version: 10
serial: 00:26:b9:01:e1:08
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 firmware=sb v2.17 latency=0 link=no multicast=yes port=twisted pair
resources: irq:50 memory:fc100000-fc10ffff
7 iwlist scan:
lo Interface doesn't support scanning.

wlan1 Scan completed :
Cell 01 - Address: 00:1D:D1:35:BB:60
Frequency:2.437 GHz (Channel 6)
Quality=69/70 Signal level=-41 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Extra: Last beacon: 50604ms ago
IE: Unknown: 0009484F4D452D42423632
IE: Unknown: 010882848B961224486C
IE: Unknown: 030106
IE: Unknown: 2A0106
IE: Unknown: 32040C183060
IE: Unknown: 2D1A0C0016FFFF0000000000000000000000000000000C0000 000000
IE: Unknown: 3D1606000100000000000000000000000000000000000000
IE: Unknown: 3E0100
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F 00
IE: Unknown: 0B05000025127A
IE: Unknown: 7F0101
IE: Unknown: DD07000C4307000000
IE: Unknown: 0706555320010B10
IE: Unknown: DD7D0050F204104A0001101044000102103B00010310470010 2880288028801880A880001DD135BB60102100054152524953 10230006544738363247102400065254323836301042000831 323334353637381054000800060050F2040001101100124152 52495320544738363220526F75746572100800020084103C00 0101

eth0 Interface doesn't support scanning.8 lsb_release -d:
Description: Ubuntu 12.04.1 LTS9 uname -mr:
3.2.0-29-generic-pae i686 10 sudo /etc/init.d/networking restart:
* Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces
* Reconfiguring network interfaces... [ OK ]
Any help or explanation of what I am doing (wrong) or any decent explanation of anything really is greatly appreciated.

Thank you

January 16th, 2013, 08:30 AM
It looks like you're not using the latest kernel available - ? Have you tried updating it to latest in the repository?

I am using a 5100 card in a couple of Dell laptops with Ubuntu 12.04.1 and have had no connections issues at all with them (one install is a 32 bit, one is 64 bit). In fact, I don't have to disable 802.11n speeds - I get good local transfer rates on my network. I'm using an 802.11n Asus router with DD-WRT, WPA2 Personal, AES. What kind of router are you connected to?

January 16th, 2013, 09:04 AM
you may not even have a linux issue. Have you changed your channels at all? are you losing connection on a hard wire? are you on a cisco router?

January 17th, 2013, 05:44 AM
I dont think it is an issue with any of my hardware as when I boot into windows 7 my wifi connection works flawlessly.

My modem/router is a comcast/xfinity Arris TG862G/GT model

How would I update my kernel?

January 17th, 2013, 07:12 AM
In Ubuntu, kernel updates are pushed with regular updates. If you look at updates listed in Update Manager, you'll probably see a couple related to the kernel. Or you can just do all updates and that should nail it.

I have seen issues with routers where wireless worked fine with Windows but not with Linux. One issue used to be WiFi Protected Setup; I always disable that in my routers, anyway, but I have seen cases where WPS messed up Linux connections. But that was a couple of years ago.

I will say that I have used my Dell laptop with 5100 wireless card on dozens of WiFi hot spots over the years in coffee shops, airports, etc. and have never had a problem I can recall since I started with 10.04 LTS and not since a more recent change to 12.04 LTS. I get great connection speeds, solid connections, no real issues.

January 30th, 2013, 05:05 AM
With a wired connection (after it failed when 2/3rds done on my wireless connection) I performed all updates. Following the post-update reboot, the same problem was present. I tried the series of commands I mentioned in my first post:

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

but this time, it had bad results. Upon entering the third command I got a fatal error and my network list emptied:

ubuntu@ubuntu:~$ echo "options iwlwifi 11n_disable" | sudo tee /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable
ubuntu@ubuntu:~$ sudo modprobe -rfv iwlwifi
rmmod /lib/modules/3.2.0-29-generic-pae/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
rmmod /lib/modules/3.2.0-29-generic-pae/kernel/net/mac80211/mac80211.ko
rmmod /lib/modules/3.2.0-29-generic-pae/kernel/net/wireless/cfg80211.ko
ubuntu@ubuntu:~$ sudo modprobe -v iwlwifi
insmod /lib/modules/3.2.0-29-generic-pae/kernel/net/wireless/cfg80211.ko
insmod /lib/modules/3.2.0-29-generic-pae/kernel/net/mac80211/mac80211.ko
insmod /lib/modules/3.2.0-29-generic-pae/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko 11n_disable
FATAL: Error inserting iwlwifi (/lib/modules/3.2.0-29-generic-pae/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko): Invalid argument

Any ideas?
Any help is greatly appreciated. I really want to get this sorted out but I dont even know what I'm looking at or where to begin.

Thanks again.

January 30th, 2013, 05:42 AM
You have show options listed two different ways - what did you actually put in the modprobe conf file?

This is correct:

options iwlwifi 11n_disable=1

This below is invalid:

options iwlwifi 11n_disable

Forget about the tee. Just open the file and edit it properly. In a terminal type:

gksu gedit /etc/modprobe.d/iwlwifi.conf

and set the options correctly.

Also, I see errors in "3.2.0-29" kernel. That indicates that you didn't reboot after the update or didn't do all the updates? You should be on 3.2.0-36 . 29 is the old one .

January 30th, 2013, 05:52 AM
I want to point out again that I have four laptops (myself + family/friends) using this 5100 card running 12.04 (three Dells, one Acer) and I have not needed this option to disable 802.11n . I get great wireless N connections all the time. I use my primary laptop on numerous access points of all types and never wireless problems.

But, it is worth a try if you are having problems.

February 17th, 2013, 04:58 PM
I have also this problem, Asus M50VC intel 5100 Ubuntu 12.10

iwconfig show always: Bit Rate=1 Mb/s
even if I’m standing near router
connections freeze o_O