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Message-Id: <200812101123.00055.oliver@neukum.org> Date: Wed, 10 Dec 2008 11:22:59 +0100 From: Oliver Neukum <oliver@...kum.org> To: Henrique de Moraes Holschuh <hmh@....eng.br> Cc: Witold Szczeponik <Witold.Szczeponik@....net>, linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, Bjorn Helgaas <bjorn.helgaas@...com>, Adam Belay <abelay@....edu>, rjw@...k.pl Subject: Re: [PATCH] PNPACPI: Enable Power Support Am Mittwoch, 10. Dezember 2008 10:53:15 schrieb Henrique de Moraes Holschuh: > 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. If 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? It is bad enough we don't > have any sort of proper USB power control, but to leave the entire USB > 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-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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