[Gta04-owner] Modem reenummerating (was: Re: Crowdfunding an Ubuntu smartphone)

Lukas Märdian luk at slyon.de
Sat Aug 24 23:24:29 CEST 2013


Am 24.08.2013 23:04, schrieb NeilBrown:
> On Sat, 24 Aug 2013 14:22:55 Radek Polak <psonek2 at seznam.cz> wrote:
>> And the reenumerating modem - i really dont understand why we havent
>> tried newer firmware. For me missed calls is quite serious problem.
>
> I'm starting to think the the re-enumeration could be an omap-usb
> problem. I turned off a couple of power-saving features and the rate
> at which my modem reenumerates went way down. Sometimes the the modem

Hmm could this by any chance have something to do with the infamous
Linux-USB problem, recently pointed out by Sarah Sharp?
  http://permalink.gmane.org/gmane.linux.usb.general/93288

> disappears and comes back.  Sometimes it disappears and doesn't come
> back.  In those cases if I rmmod the relevant modules and
> modprobe them again it sometimes comes back and sometimes doesn't.
> When rmmod/modprobe doesn't work, a reboot does.
> But the reboot doesn't remove power from the modem so just resets the
> omap. So it seems that the problem must be in the omap-usb driver. At
> the very least if we could get it to reset the connection to the same
> level as a reboot resets it, then we should be able to improve
> reliability.
>
> Oh, and by the way:  Don't "rfkill block wwan" :-(  It doesn't
> actually cause the modem to stop transmitting, but it does cause it
> to be behave very badly in intermittent ways.  My phone had been very
> unstable for quite a while and I eventually traced it to an "rfkill
> block all" that I had in my startup scripts.  Removing that helped a
> lot.

BR,
  Lukas

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