From: Joseph Salisbury <joseph.salisbury@canonical.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg KH <gregkh@linuxfoundation.org>,
rtatiya@codeaurora.org,
Robert Ancell <robert.ancell@canonical.com>,
"mathias.nyman@linux.intel.com" <mathias.nyman@linux.intel.com>,
chasemetzger15@gmail.com, baolu.lu@linux.intel.com,
oneukum@suse.com, kborer@gmail.com, jun.li@freescale.com,
USB list <linux-usb@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed devices
Date: Tue, 28 Jun 2016 11:44:21 -0400 [thread overview]
Message-ID: <57729B55.4080804@canonical.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1606281138440.1697-100000@iolanthe.rowland.org>
On 06/28/2016 11:40 AM, Alan Stern wrote:
> On Tue, 28 Jun 2016, Joseph Salisbury wrote:
>
>> On 06/24/2016 08:06 AM, Joseph Salisbury wrote:
>>> On 06/22/2016 12:14 PM, Greg KH wrote:
>>>> On Wed, Jun 22, 2016 at 11:38:43AM -0400, 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@codeaurora.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?
>>>> Does the problem still happen with 4.7-rc4 or even 4.6?
>>>>
>>>> 4.2 is pretty old and obsolete you know :)
>>>>
>>>> thanks,
>>>>
>>>> greg k-h
>>> The regression does exist in 4.6-rc2. I'll have the latest mainline
>>> 4.7-rc4 kernel tested.
>> The 4.7-rc4 kernel still exhibits the bug.
> Have you tried adding a NO_LPM quirk entry for this device, as I
> suggested in an earlier email? I can write a patch for this, if you
> want.
>
> Alan Stern
>
Thanks for the suggesting, Alan. I'll give this a try and reply with
the result.
next prev parent reply other threads:[~2016-06-28 15:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 15:38 [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed devices Joseph Salisbury
2016-06-22 16:14 ` Greg KH
2016-06-24 12:06 ` Joseph Salisbury
2016-06-28 15:09 ` Joseph Salisbury
2016-06-28 15:40 ` Alan Stern
2016-06-28 15:44 ` Joseph Salisbury [this message]
2016-07-06 20:27 ` Joseph Salisbury
2016-06-22 16:30 ` Alan Stern
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