2013/11/15 Bjorn Helgaas [off-list ref]:

Why would it be unlikely to fix the driver?  Do people think the
problem is not actually in the driver?

Asking Lenovo how to disable L1 PM substates is really a non-answer.
Only the extremely technical and extremely patient user (hi wzyboy :))
will even bother to investigate why wifi works fine with Windows but
not with Linux.  The only thing Lenovo *could* do is to release a new
BIOS with a switch to control L1 PM Substates.  If I were Lenovo, I
would never do that because then I would have to tell customers
"disable this for Linux, enable this for Windows," and I'd have to
deal with support calls about devices using more power than they
should, battery life being shorter, etc.  Plus you'd have to ask every
Linux user to upgrade their BIOS.  That's all just a terrible user
experience.

I am a little confused. There are two sets of "setpci" commands, both
of which can make me use my NIC reliably. But you two say they are
just workarounds, not real fixes.

I know the "side effect" of first two "setpci" commands is consuming
more power. (Actually by my experience of running on battery, I did
not notice ...)

But Grumbach said after the second two "setpci" commands enables "L1".
Does it mean it saves power? So what's the "side effect" of second two
"setpci" commands?

IMHO, if this could user use their NIC reliably, maybe Grumbach may
write these commands to iwlwifi driver and run them when 7260 is
detected...

BTW, no replies from Lenovo, yet.

--
wzyboy