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Date: Wed, 01 Dec 2010 16:12:14 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: [Qemu-devel] Re: [patch 2/2] support for UHCI suspend / remote wake
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To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>, Adam Jackson <ajax@redhat.com>, qemu-devel@nongnu.org, kvm <kvm@vger.kernel.org>, Glauber de Oliveira Costa <gcosta@redhat.com>

On 11/25/10 18:04, Marcelo Tosatti wrote:
> This patch enables USB UHCI global suspend/resume feature. The OS will
> stop the HC once all ports are suspended. If there is activity on the
> port(s), an interrupt signalling remote wakeup will be triggered.
>
> To enable autosuspend for the USB tablet on Linux guests:
>
> echo auto>  /sys/devices/pci0000:00/0000:00:01.2/usb1/1-1/power/level

Hmm, did you ever got this working sanely?

/me sees bus disconnects in the guest ...

>               port->ctrl&= ~(val&  0x000a);
> +            port->ctrl&= ~(port->ctrl&  0x0040); /* clear port resume detected */
>           }

This chunk looks suspicious ...

I suspect the port suspend/resume emulation isn't complete.

/me goes debugging,
   Gerd