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 <rtat...@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
