linux-kernel - Re: [linux-usb-devel] usb still sucks battery in -rc7-mm1

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Message-Id: <200609271546.16604.david-b@pacbell.net>
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.

  
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