linux-kernel - Re: [linux-usb-devel] [PATCH] USB: Only enable autosuspend by default on certain device classes

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Message-ID: <039701c7d5ef$17c90ae0$03c8a8c0@kroptech.com>
Date:	Fri, 3 Aug 2007 12:55:27 -0400
From:	"Adam Kropelin" <akropel1@...hester.rr.com>
To:	"Dave Jones" <davej@...hat.com>, "Jiri Kosina" <jikos@...os.cz>
Cc:	"Matthew Garrett" <mjg59@...f.ucam.org>,
	"Oliver Neukum" <oliver@...kum.org>,
	"Rogan Dawes" <lists@...es.za.net>, "Greg KH" <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>,
	"David Brownell" <david-b@...bell.net>,
	"Alan Stern" <stern@...land.harvard.edu>,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] [PATCH] USB: Only enable autosuspend by	default on certain device classes

Dave Jones wrote:
> On Fri, Aug 03, 2007 at 05:31:52PM +0200, Jiri Kosina wrote:
>
>>> Plus if you're connected to such a device for monitoring purposes
>>> you're probably powered by it as well, so you have little to gain
>>> from suspend even if it works.
>>
>> I currently don't have any HID UPS by hand to verify, but I'd be
>> surprised if they would advertise remote wakeup capability ... ?
>
> Looks like mine does..
> [...]
>  idVendor           0x051d American Power Conversion
>  idProduct          0x0002 Back-UPS Pro 500/1000/1500

*notes to self to send pci.ids patch again*

>  bcdDevice            1.06
>  iManufacturer           3 APC
>  iProduct                1 Back-UPS ES 500 FW:801.e6.D USB FW:e6

Yup, I have one of those in my arsenal and see the same thing.

>  iSerial                 2 AB0530291763
>  bNumConfigurations      1
>  Configuration Descriptor:
>    bLength                 9
>    bDescriptorType         2
>    wTotalLength           34
>    bNumInterfaces          1
>    bConfigurationValue     1
>    iConfiguration          0
>    bmAttributes         0xe0
>      Self Powered
>      Remote Wakeup

I have reports of APC UPS remote wakeup working properly on "recent" 
PowerMac G5s running OS X, but was never able to duplicate that success 
on my cruddy old G3. I never figured out if it was a deficiency of the 
UPS, the G3, or the OS. So it is possible that with appropriate OS 
support this feature may actually work on certain UPSes (APC has a habit 
of messing up the firmware differently on each model, so it's likely 
hit-or-miss, but they are improving).

--Adam

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