linux-kernel - Re: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed devices

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Message-ID: <Pine.LNX.4.44L0.1606221229130.1818-100000@iolanthe.rowland.org>
Date:	Wed, 22 Jun 2016 12:30:00 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
cc:	rtatiya@...eaurora.org, Greg KH <gregkh@...uxfoundation.org>,
	Robert Ancell <robert.ancell@...onical.com>,
	"mathias.nyman@...ux.intel.com" <mathias.nyman@...ux.intel.com>,
	<chasemetzger15@...il.com>, <baolu.lu@...ux.intel.com>,
	<oneukum@...e.com>, <kborer@...il.com>, <jun.li@...escale.com>,
	USB list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed
 devices

On Wed, 22 Jun 2016, Joseph Salisbury wrote:

> Hi Rupesh,
> 
> A kernel bug report was opened against Ubuntu [0].  After a kernel
> bisect, it was found that reverting the following commit resolved this bug:
> 
> commit a8425292816ceaa8c49e29d2114e85d85a73e080
> Author: Rupesh Tatiya <rtatiya@...eaurora.org>
> Date:   Tue Apr 14 16:36:55 2015 +0530
> 
>     usb: Enable LPM for USB 2.01+ full-speed devices
> 
> 
> The regression was introduced as of v4.2-rc1.
> 
> I was hoping to get your feedback, since you are the patch author.  Do
> you think gathering any additional data will help diagnose this issue,
> or would it be best to submit a revert request?

Another option is to add a NO_LPM quirks entry for the troublesome 
device.

Alan Stern