I have this same problem (Ubuntu 11.10, dual-boot installation via Wubi,
on a Samsung laptop--not sure of the model but it's brand new). lshw
shows this for my wireless device:
description: Wireless interface
product: Centrino Advanced-N 6230
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:01:00.0
logical name: wlan0
version: 34
serial: 88:53:2e:67:ea:85
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet
physical wireless
configuration: broadcast=yes driver=iwlagn
driverversion=3.0.0-12-generic firmware=17.168.5.1 build 33993 ip=192.168.1.108
latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
resources: irq:42 memory:c0500000-c0501fff
Disabling the power management via iwconfig seems to solve the problem.
However, this is NOT persistent. When I reboot, it's set back to "on"
and I get power issues.
I tried adding a script to /etc/network/if-pre-up.d that turned off
power management, but that script was never being invoked (I added an
echo to a file in /tmp which never showed up). I don't know why that
script is not invoked??
I moved it to /etc/network/if-up.d and now it seems to work (although it
takes a long time for me to get my first wireless connection, I think
because the power management is not disabled until after the first
connection).
Also, after rebooting a few times testing this out, my wireless got into
some strange state where it would NEVER connect, and just continued to
ask me for the wireless password (even though it already knew the right
password). I rebooted into Windows, then back to Ubuntu, and so far
it's been OK and the wireless is stable.
I really wonder why my pre-up scripts are not being invoked, though: I
think if I could disable the power management before trying to bring up
the interface I could connet
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https://bugs.launchpad.net/bugs/548992
Title:
Wireless connection frequently drops [deauthenticating by local
choice (reason=3)]
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