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Message-ID: <Pine.LNX.4.64.0709211615520.22331@twin.jikos.cz> Date: Fri, 21 Sep 2007 16:18:42 +0200 (CEST) From: Jiri Kosina <jikos@...os.cz> To: Hans de Goede <j.w.r.degoede@....nl> cc: linux-kernel <linux-kernel@...r.kernel.org>, linux-usb-devel@...ts.sourceforge.net Subject: Re: USB autosuspend and turning of usb pendrive leds (linux-usb-devel needs CC) On Fri, 21 Sep 2007, Hans de Goede wrote: > 1) Would it be possible to funtionality to the kernel to suspend a device in > such a way that it will automatically unsuspend when used again? It is possible - USB now supports autosuspend. After a long debate, it was however devcided that it is explicitly turned off, and userspace is free to turn it on via sysfs interface for whatever devices the user likes to do so. This is mainly because there is a huge load of USB devices out there that don't support this feature correctly, and we will break them if we perform autosuspend automatically. > 2) Would it be possible to still make the polls succeed then with out > unsuspending the device (or atleast without doing something that > would make the led light again, what makes the led light exactly is > unknown), or should hal stop polling then? How would you know how exactly respond to poll() that no userspace program gets confused? There are many different kinds of USB devices. -- Jiri Kosina - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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