@matigo To be absolutely fair, it was weird under Vista as well. Same problem, so I don’t think we can blame Ubuntu on this particular case.
Will try to dig in the BIOS and see if there’s any oddities. Should be set to Asia/Japan in the time zone. Double checked that a while back.
At least with the USB connected WiFi adapter I bought it’s not Broadcom, but RAlink, which apparently has nicer Linux support. 🙂