2018-05-24 11:01 GMT+01:00 Hans Petter Selasky <h...@selasky.org>: > On 05/24/18 11:59, Edward Napierala wrote: > >> 2018-05-24 8:41 GMT+01:00 H. Schmalzbauer - OmniLAN < >> h.schmalzba...@omnilan.de>: >> >> Am 23.05.2018 um 22:35 schrieb Ravi Pokala: >>> >>> Hi Traz, >>>> >>>> You're referring to power consumption in terms of (milli)Amps. That's >>>> not >>>> right; power is measured in Watts. What you're actually talking about is >>>> *current*. And it looks like in some situations USB devices can draw >>>> more >>>> than 500mA. >>>> >>>> >>> Since the voltage isn't a variable when talking about USB power, speaking >>> of "power" while refering to current seems valid to me – it's 5 V only >>> and >>> those who read that don't even need to do any math in head. >>> I never read 2500mW in USB world, 500mA is common. >>> Just my 2¢ >>> >>> >> I've just did some googling, and it seems you're right - while from >> physics >> point of view mA is definitely current and not power, pretty much >> everywhere I look the USB power (reported in bMaxPower) is specified in >> mA, >> not mW. Thus, I'm leaning toward leaving it as it is - wrong from a >> physics point of view, but aligned with the the USB naming convention. >> >> > Even though implict, we could specify mA at 5Volt in the sysctl > description.
Good idea, done! _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
