Ubuntu Networking :: WIFI Performance Degraded After Upgrade To 10.10

Jan 12, 2011

I would like to re-raise this topic that I have seen on other discussion boards but seems to be going no where.I have been using Ubuntu for many years now having switched from other distributions. All my machines ran some version of Ubuntu, until just recently. I upgraded my personal HP TX2500 from 9.04 to 10.04. No problems. After 10.10 had been out for a while I upgraded again. The wireless would drop when busy/(signal slightly weakened) etc. It would not function again unless the wifi module was reloaded.

Then I installed 10.10 on my HP NC6400 the same thing occured. I installed Ubuntu 10.04 instead. It seemed no better. After some Googling, it seemed I was not alone. I tried all the suggestions I could find and none of them worked. One suggestion was to install Fedora 14. This works perfectly on the nc6400. The HP TX2500 has been reinstalled back with 10.04 where the wireless seems ok and I assume I am stuck there for a while.

Now my question is why would the networking behave this way for Ubuntu 10.10 (10.04 as well on the NC6400) but wireless on Fedora 14 is perfect (I mean really good! Better than either Ubuntu 10.04 or 10.10 on any of my laptops) on the NC6400. I am hoping that we can find a way to fix this, otherwise I will likely have to drop Ubuntu completely because I do not have an upgrade path for laptops. There must be many other users in the same position who are not discussing it and just rebooting each time this occurs. This must give a negative perception of otherwise great software.

Systems running Linux

Dell D610
HP TX2500
HP NC6400
IBM T20

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Oct 13, 2010

I'm facing a strange problem after upgrading my Ubuntu to 10.10. After I start up the system, the wifi is not getting connected by default (which was getting connected automatically in the earlier version). So I right click on network manager and click on 'Enable Wireless' option and it gets connected. So far so good. Now I close the laptop lid - it goes to sleep mode and after it wakes up, the wifi never gets connected. When I right click on the network manager icon, the 'Enable Wireless' option is disabled! I have to reboot my machine to get connected!

Here are the details:
Code:
Laptop : Lenovo U330
lshw -C network output:
*-network
description: Wireless interface
product: PRO/Wireless 5100 AGN [Shiloh] Network Connection
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 00
serial: 00:21:5d:0b:08:d6
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlagn driverversion=2.6.35-22-generic firmware=8.24.2.12 ip=192.168.1.3 latency=0 multicast=yes wireless=IEEE 802.11abg
resources: irq:46 memory:e4500000-e4501fff

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Here are some details:

Code:

Code:

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Code:
rick@pond:~$ uname -a
Linux pond 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

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but now i don't have a wifi connection anymore - there is no icon shown in the system tray and the led does not blink. the network configuration tool shows eth1 to be inactive and the button to activate it is grey.

lspci -v shows:
Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05)
Subsystem: Intel Corporation IBM ThinkPad R50e
Flags: bus master, medium devsel, latency 64, IRQ 21
Memory at 90306000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: ipw2200
Kernel modules: ipw2200

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comp. model:

msi wind u100 netbook, ubuntu 10.10, kernel: 2.6.35-24-generic i686

lspci:

Code:

02:00.0 Network controller: RaLink RT2860
Subsystem: Micro-Star International Co., Ltd. Device 6890
Physical Slot: 0-1
Flags: bus master, fast devsel, latency 0, IRQ 17

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The network manager doesn't display available wifi nets. The output for lsusb is:

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lauren@lauren-Inspiron-1501:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.

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service NetworkManager stop
ifconfig -a
Then
ifconfig wlan0 up
dhclient wlan0

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Code:
[12879.434115] irq 22: nobody cared (try booting with the "irqpoll" option)
[12879.434121] Pid: 0, comm: swapper Tainted: P 2.6.35-22-generic #34-Ubuntu
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My exact hardware:

Code:

I notived the following problems in /var/log/kern.log

Code:

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