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

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

Post by Oliver Neu » Sat, 04 Aug 2007 23:40:10


Am Freitag 03 August 2007 schrieb Dave Jones:


vendor:product please.

In addition, I'll make a config option for usblp using autosuspend.

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

Post by David Brow » Sun, 05 Aug 2007 00:30:22


> We have been playing with runtime autosuspend of HID devices, are >> currently postponed the full support, as it turns out that many devices > > don't support this feature properly (probably due to not being tested in>
> Windows>.
> Interesting. hich devices did you notice failin>?
> Was it a case that they would sleep and not come back out of that state?

And could you elaborate on "many"? What proportion of HID devices
(by volume, model, etc) seem to have problems?

I'd certainly expect there to be some HID devices which misbehave
(I have one, a cheap MacAlly trackball). Early testing seemed to
indicate such misbehavior was the exception to the rule ... folk
kept disbelieving me when I pointed out some HID devices misbehaved,
since nobody else had seen such a thing!

The specific failure I saw was that the device advertised itself as
supporting remote wakeup, but it couldn't issue that signaling. It
came back from suspend just fine ... but moving or clicking would
not do what it should.

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

Post by Adam Krope » Sun, 05 Aug 2007 02:00:13


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


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


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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