[Gta04-owner] Replicant modem suspend behavior

[Lukas Maerdian]

Am 12.12.2014 um 16:41 schrieb Rico Rommel:
> Am Freitag, 12. Dezember 2014, 16:17:54 schrieb Lukas Maerdian:
>> Hello everybody,
>>
>> since quite some time I'm trying to debug the Replicant modem suspend
>> behavior, but I cannot find any solution...
>>
>> My problem is that the modem transitions into a strange state after a
>> suspend/resume cycle, where it just returns the CME error 0 (phone
>> failure) to every single AT command I send. If I kill/restart the Radio
>> Interface Layer ("killall rild"), the modem seems to be working fine
>> again, so I guess a "AT+CFUN=0; AT+CFUN=1" correctly resets the modem.
> 
> I don't know if it's related to this or a bug in my phonesoftware, but on 
> resume my phone switches automatically to airplane mode. So I have to set 
> operating mode everytime the phone resumes. 
> I use kernel 3.12 and can't remember, if this problem also existed with kernel 
> 3.7.

Hi Rico,

indeed this seems to be the case! I'm on 3.12 as well and directly after
resume everything is fine (CFUN: 1) but about 1 sec after the resume I
receive a "+CREG: 0" URC and if I issue "AT+CFUN?" afterwards I receive
a "+CFUN: 4", i.e. airplane mode.

So, after this I can simply switch airplane mode off (AT+CFUN=1) and the
device will be back online! Well... the 3G connection still needs to be
re-configured, but this is another issue.

Thanks a bunch, this was the missing piece I was looking for!

I assume the modem is still operational during suspend, i.e. is able to
receive calls/SMS and interrupt the CPU, can you confirm this?

Best,
  Lukas

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