[Bug 614274] Re: modem-manager fails to recognize 3G modem after suspend/resume

[Kamal Mostafa]

A few ideas...

1. Lets compare BIOS versions, and lets all upgrade to the latest.

"sudo dmidecode -s bios-version" on my T61 showed BIOS version "2.10".

I've just updated mine to BIOS version "2.27" a.k.a. "7LETC7WW (2.27-1.08)" using the .iso image here:
 http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-67989

The complete list of changes does include references to all sorts fixes that might be relevant here, both to the intermittent modem problem and to the crashes you're experiencing:  "memory may get garbled during ... resume", "Unexpected interrupts from the USB controller", etc..  (FWIW, I'm not experiencing these crashes).  Complete BIOS change list:
 http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-68451


2.  What happens if you insert a "sleep 1" right above the "rfkill unblock" line in the modified 20_wwan script from comment #30?


3. I noticed this BIOS option:  Config->USB-->"Always on USB" which leaves USB ports powered during low power states (it is disabled on my machine).   It might be interesting to try enabling it on one of the machines that exhibits the problem (and revert to the kernel and setup where the problem was happening frequently).

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modem-manager fails to recognize 3G modem after suspend/resume
https://bugs.launchpad.net/bugs/614274
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