I can confirm this bug - I have the same problem on a new Dell Latitude 6400
Notebook with an Intel 5100 WLAN adapter.
Several other people appear to have this problem as well (see threads:
http://ubuntuforums.org/showthread.php?t=1307396 or
http://ubuntuforums.org/showthread.php?t=1305616 or
http://swiss.ubuntuforums.org/showthread.php?t=1305190 (the proposed solution
turning ACPI off, didn't work for me))
I have been running the Karmic beta version on this netbook.
Interestingly, WLAN didn't work in the beginning, after some updates it
did - for a few days - and then it ceased to work maybe 2-3 days prior
to the release candidate (I thought about posting a bug report - I
really should have in retrospect... sorry)
The relevant section of "lshw -c network" looks pretty similar
*-network DISABLED
description: Wireless interface
product: Wireless WiFi Link 5100
vendor: Intel Corporation
physical id: 0
bus info: p...@0000:0c:00.0
logical name: wmaster0
version: 00
serial: 00:24:d6:24:47:80
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list logical ethernet
physical wireless
configuration: broadcast=yes driver=iwlagn latency=0 multicast=yes
wireless=IEEE 802.11abgn
resources: irq:22 memory:f1ffe000-f1ffffff
Hope this helps.
--
intel pro/wireless 5100 AGN disabled
https://bugs.launchpad.net/bugs/464199
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