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Date: Wed, 27 Sep 2006 15:46:16 -0700 From: David Brownell <david-b@...bell.net> To: linux-usb-devel@...ts.sourceforge.net Cc: "Theodoros V. Kalamatianos" <thkala@...tlab.ece.ntua.gr>, Pavel Machek <pavel@....cz>, Greg KH <greg@...ah.com>, kernel list <linux-kernel@...r.kernel.org> Subject: Re: [linux-usb-devel] usb still sucks battery in -rc7-mm1 On Sunday 24 September 2006 5:18 am, Theodoros V. Kalamatianos wrote: > I have encountered at least 3 hubs (2 usb2 & 1 usb1) that will consume a > lot of power (about 2-2.5W if the laptop power consumption readings are to > be trusted) and heat up a lot (to the point of being too hot to touch for > more than a few seconds) even when no devices are connected, at least on > Linux. I have not tested them on a Windows machine to see if this is the > case there. The USB2 ones used Cypress chips. I do not know what your h/w > config is, but perhaps this is a similar case ? Probably not unrelated. I have one of those Cypress-based hubs; it's nice except for the heat/power, which precludes using them in bus-powered mode with a laptop (or anything) ... I don't much like wall-warts! It might be too much to expect that when that hub's upstream port is suspended, its power usage goes to something reasonable. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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