From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [patch 2/2] support for UHCI suspend / remote wake up
Date: Wed, 01 Dec 2010 16:12:14 +0100
Message-ID: <4CF665CE.70600@redhat.com>
References: <20101125170439.548474575@redhat.com> <20101125170602.676792336@redhat.com>
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Cc: qemu-devel@nongnu.org, kvm <kvm@vger.kernel.org>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Adam Jackson <ajax@redhat.com>,
	Glauber de Oliveira Costa <gcosta@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
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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