recently (about a week ago) i updated KP49 beta to KP49 from extras devel. it seems to work stable, but i noticed i still have bugs related to usb networking, which may lead to reboot. ... - I managed to usb networking (where PC is router and PC and N900 are linked by usb cable) be able to run on stock kernel, and it occured that USB-networking-bug happenned at least once (it was the bug not plain incompability since i was able to transfer some data) - the one above suggests it's a bug in driver, so it's not mainly related to the kernel power, but it may be a bug in driver firing a bug in KP (we had some once, and i believe it shouldn't crash the system, just break connection)