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

[Alan Stern]

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@xxxxxxxxxxxxxx>
> 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