This messages appeared in syslog:
kernel: iwlagn 0000:03:00.0: Microcode SW error detected. Restarting 0x2000000.
kernel: Registered led device: iwl-phy0::radio
kernel: Registered led device: iwl-phy0::assoc
kernel: Registered led device: iwl-phy0::RX
kernel: Registered led device: iwl-phy0::TX
I haven't noticed any service degradation, I'm not even sure what triggered this, since I connected through SSH to the machine, but it had no traffic.
00:19.0 Ethernet controller: Intel Corporation 82577LM Gigabit Network Connection (rev 06)
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)
If relevant, the machine is Lenovo W510.
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Sounds like the firmware from Intel crashed and we recovered -- what else could we do?
I though there might be a firmware update or adjustments how communication is done. If there's nothing that can be done, then I agree with CANTFIX :)