Hi, This might be a known kernel bug[1] which got fixed recently. The problem is somewhere in the b43/ssb driver, which won't get activated until you install the necessary firmware files. Could you try the latest linux kernel from experimental? I'm having this problem (black screen, machine freezes during boot) on one of my notebooks (HP Compaq 615). I'm using the proprietary driver[2] as a workaround for the time being. That works w/o problems.
Best regards Alexander Kurtz [1] https://bugzilla.kernel.org/show_bug.cgi?id=14716 (currently broken) [2] http://packages.debian.org/squeeze/broadcom-sta-source
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