linux-kernel - Re: xhci_hcd: Runtime PM causes port to inactivate

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Date:	Sun, 04 Dec 2011 21:02:06 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Patrik Kullman <patrik.kullman@...il.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	michal@...pspace.math.ualberta.ca, Oliver Neukum <oneukum@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"pavel@....cz" <pavel@....cz>,
	"len.brown@...el.com" <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: xhci_hcd: Runtime PM causes port to inactivate

There is a very similar discussion going on at:
http://thread.gmane.org/gmane.linux.kernel/1222803

Cc'ing all the relevant people and mailing lists.

Regards,
Srivatsa S. Bhat

On 12/04/2011 04:47 PM, Patrik Kullman wrote:

> Issuing
> 
> echo auto > /sys/bus/pci/devices/0000:03:00.0/power/control
> 
> on my Asus Zenbook UX31E with a
> 
> 03:00.0 USB Controller: Fresco Logic Device 1009 (rev 02)
> 
> causes its USB3-port to become mostly disabled.
> 
> It does have a "Charger+" feature that allows it to charge cellphones
> etc even when turned off, and this feature works when power control is
> in "auto" mode.
> 
> In all other aspects, the port is turned off. It doesn't react to
> devices being inserted.
> 
> This does not feel like the desired behavior.
> 
> Also, suspend does not work without unbinding the xhci_hcd module, not
> sure if that is related.
> Computer will not suspend/resume unless the following script is used
> in /etc/pm/sleep.d:
> https://help.ubuntu.com/community/AsusZenbook#Suspend.2C_Hibernate.2C_Shut-down_and_Reboot
> 
> This behavior has not changed between 3.0 and 3.2-rc4+ that I've tried today.


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