Dell 5570 (Sierra) supported?

[Dan Williams]

On Mon, 2014-12-01 at 18:31 +0100, Manuel Lauss wrote:
> On Wed, Nov 26, 2014 at 9:41 AM, Bjørn Mork <bjorn at mork.no> wrote:
> > Dan Williams <dcbw at redhat.com> writes:
> >> On Tue, 2014-11-25 at 20:03 +0100, Manuel Lauss wrote:
> >>> > On Tue, 2014-11-25 at 19:54 +0100, Manuel Lauss wrote:
> >>> >
> >>> >>            |    power state: 'low'
> >
> > Ouch.  Now I remembered where I last heard about this modem...
> > http://ubuntuforums.org/showthread.php?t=2195299&p=12886034#post12886034
> >
> > And it most likely does not have anything to do with the modem at all.
> > It is some Dell laptop rfkill feature we just don't know how to
> > enable/use.
> >
> >>> Well, rfkill list shows only bluetooth and wlan (and nfc card reader).
> >>> wwan is enabled in BIOS; the dell airplane mode switch acpi device node
> >>> doesn't do anything (tried to poke all methods with acpi_call).
> >>
> >> One more thing to double-check: is the SIM slot under the battery, and
> >> if so is the battery inserted and correctly seated?  My laptop (an HP,
> >> not a dell) has some kind of BIOS interlock so that when the battery is
> >> removed (or poorly secured) it will rfkill the WWAN card automatically
> >> to prevent SIM hotswapping.
> >
> > Smart :-)  Yes, that sounds like something to verify.
> >
> > But the fact that there is no wwan switch in the "rfkill list" output is
> > really a strong indication that we lack support for the wwan switch in
> > the dell laptop driver (for this laptop variant - it obviously works for
> > older Dell laptops).
> 
> I got it semi-working (after disabling airplane mode in windows) in that
> I can now enable the modem, but it just stays in "looking for network"
> mode forever, so rfkill is not entirely disabled.

Try:

mmcli -m 0 --3gpp-scan

and wait about 2 or 3 minutes and see what gets printed out.  It may be
"looking for network" because it can't find one that the SIM is allowed
to register with.  But doing the scan I show above will at least tell us
if it can see anything at all.

Dan