As per my post in help forum:
I think there is a bug in the 2.6.20 drivers that causes my kernel to freeze. I am running kernel 2.6.20 on Ubuntu 7.04 and have tried with both 1.3.2 and 1.3.1 drivers.
Compilation and installation is fine, the modules load with no problems, but a short time after any network traffic starts the kernel freezes with the following error:
BUG: scheduling while atomic: swapper/0x10000500/0
Thanks for the good work
Mark
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sorry forgot to say that this problem is with USB modem, PCMCIA works fine.