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View Full Version : [ubuntu] Wireless occaisonally stops working until restart in karmic



allspiritseve
November 22nd, 2009, 06:58 AM
Once in a while, my wireless connection will just cut out. I know it's not my router, as my other laptop stays connected just fine. After the connection stops working it scans but doesn't find any wireless networks. It continues on like this until I restart, and then everything works fine. Any idea what the problem is?

coffeecat
November 22nd, 2009, 10:24 AM
Any idea what the problem is?

Could be many things, but your post is short on hardware information. Let's start with the wireless chipset your device is using. It could be that you have one with a buggy driver in Karmic.

What is the make/model of laptop?

And, more specifically, to get the actual chipset of your wireless device (among other things), post the terminal output of:


sudo lshw -C network

allspiritseve
November 22nd, 2009, 10:29 AM
I'm running on a Dell Latitude e6400

Output of the command you gave me:

*-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: 00:24:e8:ad:19:eb
capacity: 1GB/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=1.0.2-k2 firmware=1.7-7 latency=0 link=no multicast=yes port=twisted pair
resources: irq:29 memory:f6fe0000-f6ffffff memory:f6fdb000-f6fdbfff ioport:efe0(size=32)
*-network
description: Wireless interface
product: Wireless WiFi Link 5100
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0c:00.0
logical name: wmaster0
version: 00
serial: 00:22:fb:b5:ec:9a
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=iwlagn ip=192.168.2.103 latency=0 multicast=yes wireless=IEEE 802.11abgn
resources: irq:30 memory:f1ffe000-f1ffffff
*-network DISABLED
description: Ethernet interface
physical id: 2
logical name: vboxnet0
serial: 0a:00:27:00:00:00
capabilities: ethernet physical
configuration: broadcast=yes multicast=yes

coffeecat
November 22nd, 2009, 10:39 AM
Well - that's interesting. I was expecting a Realtek or one of the Atheros chipsets, but not:




*-network
description: Wireless interface
product: Wireless WiFi Link 5100
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0c:00.0
logical name: wmaster0
version: 00
serial: 00:22:fb:b5:ec:9a
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=iwlagn ip=192.168.2.103 latency=0 multicast=yes wireless=IEEE 802.11abgn
resources: irq:30 memory:f1ffe000-f1ffffff


Let me show you the equivalent part of the output from the Sony laptop that I'm posting from:


*-network
description: Wireless interface
product: Wireless WiFi Link 5100
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:04:00.0
logical name: wmaster0
version: 00
serial: 00:22:fb:23:ac:d6
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=iwlagn ip=192.168.1.64 latency=0 multicast=yes wireless=IEEE 802.11abgn
resources: irq:30 memory:d0500000-d0501fffWhich is interesting, because my connection has been as steady as a rock in Karmic (in Jaunty too) and since I started using Karmic somewhere at the alpha stage. Which doesn't help you very much except to point out that the Karmic driver for your wireless is just fine. Which means we need to look elsewhere.

I would have suggested changing the channel your router is broadcasting on, in case you are getting interference from a neighbour's network on the same channel - or even from a baby alarm. But you say that the other laptop stays connected. Is this in the same room, or is the disconnecting one in a place where the signal might be weak, and/or you might be getting interference?

I'll have a ponder and post back if I think of anything else.

allspiritseve
November 22nd, 2009, 10:42 AM
Is this in the same room, or is the disconnecting one in a place where the signal might be weak, and/or you might be getting interference?
They are less than a foot from each other :P

coffeecat
November 22nd, 2009, 12:15 PM
They are less than a foot from each other :P

That *might* be the problem. :wink: Could the signals from both be interfering and the other laptop winning? I don't know but I did have something similar happen when I brought my laptop too near the USB wireless nic of my desktop.

Try two feet. :) Or even opposite sides of the room!

allspiritseve
November 23rd, 2009, 01:18 AM
That *might* be the problem. :wink: Could the signals from both be interfering and the other laptop winning? I don't know but I did have something similar happen when I brought my laptop too near the USB wireless nic of my desktop.

Try two feet. :) Or even opposite sides of the room!
I don't know, I suppose that could be what's happening, but it seems unlikely because the one laptop can't connect to ANY network, not just the one the other is connected to. Not to mention I'm pretty sure it's happened while the other computer is off-- I will check next time it happens though.

icepirate420
November 24th, 2009, 11:21 AM
I have the same issue with a Broadcom chipset, and it's not due to signal interference because my laptop is the only wireless device. This problem started after I upgraded to Karmic.

JimHQ
November 28th, 2009, 11:53 PM
I have been having the same issue with an Acer Timeline 3810T with the Intel 5100 wifi. It has been driving me nuts.
I have been down several unproductive avenues - disabling ipv6, installing WICD to replace network manager and making sure I have the latest drivers. This evening I have updated my router firmware to see if it has any effect. Will let you know if I have any joy.
Jim.

Bakudan00
December 1st, 2009, 06:14 PM
I have the exact same problem on my Gateway nv5207u. I'm surfing along nicely and then all of a sudden my connection dies, even though the panel applet says I have one. I try to reconnect but all it does is ask me for the security passphrase over and over. Only a restart will fix it, and it happens several times a day. This has never happened with Win 7 on the same machine.



*-network
description: Ethernet interface
product: NetLink BCM5784M Gigabit Ethernet PCIe
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 10
serial: 00:1f:16:cc:c6:2a
capacity: 1GB/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=3.99 firmware=sb v2.19 latency=0 link=no multicast=yes port=twisted pair
resources: irq:28 memory:f0300000-f030ffff
*-network
description: Wireless interface
product: AR928X Wireless Network Adapter (PCI-Express)
vendor: Atheros Communications Inc.
physical id: 0
bus info: pci@0000:09:00.0
logical name: wmaster0
version: 01
serial: 0c:60:76:1c:f5:d1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=ath9k ip=192.168.1.101 latency=0 multicast=yes wireless=IEEE 802.11bgn
resources: irq:18 memory:f0400000-f040ffff

coffeecat
December 1st, 2009, 08:42 PM
I have the exact same problem on my Gateway nv5207u.

You have the same symptoms, but you don't have the same problem, because....


product: AR928X Wireless Network Adapter (PCI-Express)
vendor: Atheros Communications Inc.

You have a completely different wireless chipset from the OP. However, I have good news for you. Simply install these two packages from Synaptic:

linux-backports-modules-karmic
linux-backports-modules-wireless-karmic-generic

Reboot, and your Atheros AR928X will work just fine.

Edit: assuming, that is, that you are running Karmic. You don't say.

Bakudan00
December 10th, 2009, 06:33 PM
I completely forgot about this thread. >_<

Well, I do have Karmic and I did what you told me, and so far it's working fine. My reception bumped up nicely too.

So, thanks a bunch. ;)

seattle vic
December 10th, 2009, 10:17 PM
I've also had the problem since I installed Karmic; after about 3 to 4 hours, it disconnects and I usually have to do a cold start to get a reconnection. Even restarting network-manager does not do it.

I also have the Intel 5100. The laptop ran great for many months under 9.04 without a wireless hitch.

I read in another thread that there is a kernel fix, and I did make an addition to grub:

GRUB_CMDLINE_LINUX_DEFAULT="pci=use_crs quiet splash"

(the addition was pci=use_crs) It didn't help.

I'll try loading the backport modules as suggested and get back to this thread.

coffeecat
December 10th, 2009, 10:55 PM
I'll try loading the backport modules as suggested and get back to this thread.

The backports modules were a fix for the Atheros wireless chipset. But you might get lucky. I hope so.

seattle vic
December 12th, 2009, 03:44 AM
I've been running with the backport modules installed for over a day now with no disconnects, which is encouraging, even though I have the 5100. Usually I disconnect within 3 hours. I'll do some heavy transfers from my laptop to one of my desktops tonight and see how it fares.

seattle vic
December 13th, 2009, 01:42 AM
Now have been running for two days with the backports loaded with no disconnects. I don't know what they do, but it's looking like the issue has been fixed.

adrian_nye
December 20th, 2009, 05:03 PM
For me (on Acer 5810TZ) the backports cause the wireless to not work at all after suspend, although it does not disconnect if you leave it on.

Unfortunately for a laptop this in not an improvement.

Elif
January 9th, 2010, 02:56 AM
For me (on Acer 5810TZ) the backports cause the wireless to not work at all after suspend, although it does not disconnect if you leave it on.

Unfortunately for a laptop this in not an improvement.
I'm having the exact problem on my 5810TZ. As far as I can recall, I didn't have any problems with Jaunty. I'm considering a new install of Jaunty. Has anyone confirmed wireless working with the 5810TZ in 9.04?

Looks like i'll be doing a reinstall this weekend, i'll update with my results. Thx for the quick reply.

bkratz
January 9th, 2010, 03:04 AM
I'm having the exact problem on my 5810TZ. As far as I can recall, I didn't have any problems with Jaunty. I'm considering a new install of Januty. Has anyone confirmed wireless working with the 5810TZ in 9.04?

See the second post in this thread, he is using 9.04.

http://ubuntuforums.org/showthread.php?t=1226095&highlight=5810TZ

Elif
January 10th, 2010, 08:49 PM
See the second post in this thread, he is using 9.04.

http://ubuntuforums.org/showthread.php?t=1226095&highlight=5810TZ
Okay, so I backed up to 9.04 and everything was great...

then I let the updates install, and i'm back to where I was with 9.10 :-/ Actually, it the wireless is less usable now. Which is weird because I looked through the updates to make sure that there weren't any wireless updates... I guess the bug is hidden in some kernel updates.

bama7474
February 6th, 2010, 01:26 AM
I'm experiancing the same weak wireless connection while other computers running win vista have excellent coverage. I'm running Ubuntu Netbook Remix 9.10 on a Toshiba NB305 -N410BL...From Terminal:

*-network
description: Wireless interface
product: AR9285 Wireless Network Adapter (PCI-Express)
vendor: Atheros Communications Inc.
physical id: 0
bus info: pci@0000:07:00.0
logical name: wmaster0
version: 01
serial: 00:23:08:fc:f5:72
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=ath9k ip=10.0.0.11 latency=0 multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 memory:f0100000-f010ffff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 02
serial: 00:26:22:f4:71:4d
size: 10MB/s
capacity: 100MB/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10MB/s
resources: irq:29 ioport:2000(size=256) memory:f0520000-f0520fff(prefetchable) memory:f0510000-f051ffff(prefetchable) memory:f0540000-f055ffff(prefetchable)

Any help would be great, thanks.

bama7474
February 6th, 2010, 03:19 AM
Hey I just tried the backport install and everything is working great I went from 30% to 70% signal strength, just wanted to say thanks.