Thomas,
Hello. I just wanted to confirm which version of linux-firmware you were using 
in Precise, and also which modules were loaded.
However, if you can just confirm the following it may be enough information:

* Using the Lucid kernel:
Do you need to also install the external bcm_wimax module to get this working, 
or does this work out of the box?

* Using Natty or Precise kernel: 
I see the bcm driver in drivers/staging/bcm is looking for the following files:
#define BIN_FILE "/lib/firmware/macxvi200.bin" 
#define CFG_FILE "/lib/firmware/macxvi.cfg"
However looking at linux-firmware package I don't see any files by that name 
that get installed.
So it would make sense if _just_ installing those firmware files into 
/lib/firmware potentially fixed the issue.

Does the device work fine when just installing those two firmware files?

Thanks,

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https://bugs.launchpad.net/bugs/953494

Title:
  bcm_wimax module hangs when Sierra Wireless 250U Data Card removed

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