[RFC] Probing ttys by default

Aleksander Morgado aleksander at aleksander.es
Fri Mar 21 05:14:52 PDT 2014


On Fri, Mar 21, 2014 at 1:05 PM, Lars Knudsen <larsgk at gmail.com> wrote:
>> sending a QCDM probe to see if the port replies correctly to it. If
>> nothing is replied to the probe, the port will finally be discarded.
>> This whole sequence may take up several seconds, as for each AT and
>> QCDM probe we retry a couple of times. BTW, all this is for MM 1.x,
>> the logic in MM 0.6.x is a bit different.
> How many seconds for the version in the current Chromebooks (approx?).
> As the Chromebooks are not easily possible to hack a blacklist in - AND they
> are considered a std consumer device, they will be most exposed to this
> problem.

I think it's around 9s for AT probing (3x3s) and 6s for QCDM probing (2x3s).

Ben, is the ModemManager package updated regularly in Chromebooks?
i.e. how long would it take to have a blacklist update be released in


More information about the ModemManager-devel mailing list