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

On Wed, 29 Feb 2012, Bjørn Mork wrote:

Juha Jäykkä <juhaj@iki.fi> writes:

One thing just occurred to me: I added 2 GB of memory (total 4 GB) at about
the time these problems started. I cannot say for sure the problems did not
start earlier, but it is quite possible they started after! (Please do not

This brings up an interesting point, while I have been having assorted other problems, my "deep sleep" issues may have stopped around the time that I upgraded to 8GB of RAM.

FWIW I am using the exact same card in an X301 with 8 GB memory and have
never seen any such problems. Don't think a RAM upgrade can have any
impact, except maybe by causing the card to move in its slot. I assume
that the memory slots and mini-pcie slots are behind the same cover in
the X201 as well? Replugging it seems like a good idea...

Actually, a RAM upgrade can most definitely have an impact. Replacing any hardware on the bus changes bus loads, propagation delays and overall timing of the bus. These changes may be minor, but if the system is running near the limits of the specifications and/or any component on the bus violates the specs, then all sorts of flakey behavior can ensue. Even if everyone plays by the rules, some aspects of bus timings are programmable on some hardware, so a software/firmware bug can also be a source of what would appear to be a "hardware" problems.

Unfortunately, I'm not current on the hardware/buses involved here, so I don't know how these potential issues might apply to this case.

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