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b43: Driver keeps upping CPU % until system freezes for a few seconds?



A while ago, I switched from using ndiswrapper to work my Broadcom wireless to using the b43 driver with the proper firmware.  Since then, my system seems to randomly freeze and then unfreeze (from anything between a second to a few minutes in length).  When I checked the system monitor, I noticed something strange; although the b43 driver generally doesn't use much CPU power, every once in a while, it jumps to 40-60% of the system CPU, which corresponds to the odd freezing periods.

So my question is, why would my wireless driver keep sucking CPU power until the system freezes, and then let go?

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