Hi, I'm not really sure whom to write to, so ... I'm writing to all of you, for now ;-) I just bought a USB wireless stick with an RTL8187B inside. The idea was to use it with my laptop. In principle, it works just fine ... if it didn't cause the computer to triple its idle power consumption from some 7.5 to ~ 22.5 Watts. I don't have a clue (yet) where exactly all that power goes to, and how much of it is actually being used by the stick itself (it's getting pretty warm, too - maybe you have a clue what to expect there?). But apparently, quite a bit of that increased power consumption is due to the CPU entering ACPI sleep states for a much smaller proportion of time, and not entering the highest sleep state at all anymore (which otherwise makes up around 98 % of the time) due to some polling/high-frequency interrupt of the driver. After all, even the most inefficient voltage regulator can't make 15 W from USB's max. 2.5 W (I hope ...). Now, the obvious question is: Is there anything one could do about that? And if not, or possibly even if: Any recommendation for a power-efficient USB 802.11 adapter - in particular something that does not cause CPU wakeups all the time when there is no actual network traffic? Florian -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
