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Date: Fri, 26 Jan 2007 12:54:02 -0500 (EST)
From: Justin Piszcz <jpiszcz@lucidpixels.com>
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To: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
cc: Alan Piszcz <ap@solarrain.com>
Subject: Kernel 2.6.19.2: Belkin UPS on Serial vs. USB
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When I disconnect my UPS from the wall, I have to wait 15-30 seconds 
before the USB drier 'polls' this information and tells me that the UPS is 
on battery power (via knutclient or syslog via nut):

ups@p34 POWER ALERT on Fri Jan 26 12:49:29 EST 2007

With a serial connection, I would get the alerts IMMEDIATELY (0.5-1 
seconds) after disconnecting the UPS.  My new machine does not have a 
serial port built-in, only a serial header, and of course does not come 
with an included cable, so I chose to use USB.

My question is, how do I change the polling time for the USB subsystem to 
match that of the serial port, or would I not want to do that for other 
reasons?

The reason I'd like to is I am not going to see any power alerts for 
unless there is a power outage for longer than 15-30 seconds.

Justin.