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Bug#628444: Info received (iwlagn - "MAC is in deep sleep", cannot restore wifi operation)



> For a complete power-cycle, you may need to remove both the power cord
> and the battery.  I don't think the Intel wireless cards have any

Sure, I did: detach the cord and battery, wait ten minutes, then plug them 
back in. No use.

> The log messages you sent are indicative of a total failure of
> communication with the card.  My suspicion would be that the hardware
> has developed a fault, but it could be as simple as the card being
> slightly loose in its slot.

Total? How come? It does detect the card correct, except the revision, which 
is 0xFFFFFFFF instead of 0x24 as it should. My guess is the final error comes 
from the incorrect revision number – of course it probably fails already 
somewhere earlier and simply getting the revision right (which could be hard-
coded in the driver) probably would not help.

> Having said that, are you setting the pcie_aspm kernel parameter?

Like Shannon, I have not touched it at all, so it is probably off (whatever 
the default is).

One thing I tries, is turn all PCI* related power-save features off from the 
BIOS, but that did not help.

My most important question is: how do I get back to the working state? Going 
back in driver and kernel versions does not seem to help!

I admit that the above sounds like a HW failure, but like Shannon, I do not 
believe it because a full *kernel* reboot *always* fixes the issue. Why would 
a faulty hardware get fixed when the kernel gets rebooted, but NOT when the 
computer power gets completely turned off and all the hardware reinitialised 
during a hibernate cycle. I even tried the following sequence: hibernate, 
unplug power cord and battery, wait a few minutes, plug back in, reboot *a* 
*different* *kernel*, see that the wifi works with this kernel, shut down, 
reboot with the original kernel, unsuspending from hibernate. At this point, 
the wifi does not work. I think this is quite a strong indication that this is 
NOT a HW issue.

But what makes me most confused is that rolling back to versions of wireless-
tools, firmware-iwlwifi, and kernel does not give me back a working system, 
which does suggest a hw failure.

Shannon: FWIF, I have now rebooted with pci_aspm=off and we'll see what 
happens.

Ben: I also replugged the wifi card.

Also, I am back to 3.2.6 and newest firmware (I forgot to roll back the newest 
wireless tools).

-Juha

-- 
		 -----------------------------------------------
		| Juha Jäykkä, juhaj@iki.fi			|
		| http://www.maths.leeds.ac.uk/~juhaj		|
		 -----------------------------------------------

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