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Date: Fri, 26 Jan 2007 17:51:04 -0800
From: Greg KH <greg@kroah.com>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
       Alan Piszcz <ap@solarrain.com>
Subject: Re: Kernel 2.6.19.2: Belkin UPS on Serial vs. USB
Message-ID: <20070127015104.GA11553@kroah.com>
References: <Pine.LNX.4.64.0701261250470.12467@p34.internal.lan>
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On Fri, Jan 26, 2007 at 12:54:02PM -0500, Justin Piszcz wrote:
> 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.

I think this is a userspace issue, as it's a userspace program that is
doing the polling, right?  Try asking the developers of it about this.

I think you will find it is a FAQ...

thanks,

greg k-h