Same problem on a Thinkpad T420 with a Ultimate-N 6300 (rev 35) WiFi
card since 12.04 .
If the WiFi is reconnected after failing without reloading the driver,
the problem happens much faster again as if I unloaded/reloaded the
iwlwifi driver by modprobe before reconnecting.
Becauseof this I think it is a driver problem and not a ubuntu problem.
There are no problems reported in the syslog (or kernel log).
lspci details of the WiFi module:
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)
Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at f2400000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [c8] Power Management version 3
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [e0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 00-24-d7-ff-ff-e2-d3-c0
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
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https://bugs.launchpad.net/bugs/984552
Title:
[8086:0085] iwlwifi intermittently losing connectivity
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