From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Neukum Subject: Re: [PATCH] PNPACPI: Enable Power Support Date: Wed, 10 Dec 2008 11:22:59 +0100 Message-ID: <200812101123.00055.oliver@neukum.org> References: <493D8A1F.2090907@gmx.net> <20081210095315.GA20627@khazad-dum.debian.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtp-out003.kontent.com ([81.88.40.217]:44033 "EHLO smtp-out003.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754720AbYLJKVV convert rfc822-to-8bit (ORCPT ); Wed, 10 Dec 2008 05:21:21 -0500 In-Reply-To: <20081210095315.GA20627@khazad-dum.debian.net> Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Henrique de Moraes Holschuh Cc: Witold Szczeponik , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas , Adam Belay , rjw@sisk.pl Am Mittwoch, 10. Dezember 2008 10:53:15 schrieb Henrique de Moraes Hols= chuh: > Although I do wonder WTF we don't do that on our USB UHCI/EHCI kernel > drivers, that ACPI needs to step in to fix it. =A0If it is not a wake EHCI/UHCI have no way to power down host controllers. It needs external means, namely ACPI. > device, why are we leaving it powered up? =A0It is bad enough we don'= t > have any sort of proper USB power control, but to leave the entire US= B > subsystem powered up without reason?! We don't. If you unplug all devices, USB will power down as much as is compatible with detecting new devices. > Vista not only powers down the USB HCIs and ports on STR, it also > powers down ports when you "safely remove the USB device", and seems > to leave the port powered down until you insert a device (or remove > the device already in there, whatever). If you cut power to a port, you cannot detect a hotplugging. You can suspend it, which Linux does do. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html