Ericsson F3507g cdc_acm broken with 2.6.30

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Hi,

I have an integrated wireless setup inside my Lenovo Thinkpad T400 which
normally works fine and provides WiFi, Bluetooth and WWAN connectivity.
The wifi card is utilized by the iwlagn driver, and WWAN modem appears
as cdc_acm device.

I upgraded from 2.6.28.10 to 2.6.30 and that went well as far as iwlagn
was concerned, however, I noticed that the WWAN function is broken - the
ttyACM* devices silently disappeared and won't come back - even lsusb
doesn't show the Ericsson F3507g device any more!

Is this a known problem, or do I need to bisect it?

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