Re: [Bug 197863] Thinkpad X240 resume dramatically slower on kernels 4.13+

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On Sat, Feb 03, 2018 at 07:25:54PM +0100, Markus Demleitner wrote:
> On Tue, Jan 30, 2018 at 07:32:04AM +0100, Greg KH wrote:
> > On Mon, Jan 29, 2018 at 07:21:09PM +0100, Markus Demleitner wrote:
> > > A while ago I opened bug #197863 in the kernel bugzilla:
> > > 
> > > https://bugzilla.kernel.org/show_bug.cgi?id=197863
> > > 
> > > Essentially, xhci_hcd on a resume from RAM takes several seconds on a
> > > Thinkpad X240 that is equipped with a Sierra LTE modem after an
> > > upgrade to 4.13:
> [...]
> > > Now, interestingly, there are quick resumes in 4.15.0, too, now and
> > > then.  In that case, things look pretty much like on 4.12.2.  Here's
> > > a 4.15.0 fast resume example:
> > > 
> > > [  873.127570] usb 1-4: device firmware changed
> > > [  873.277351] usb 1-8: reset high-speed USB device number 4 using xhci_hcd
> > > [  873.515141] restoring control 00000000-0000-0000-0000-000000000101/0/2
> > > [  873.583238] OOM killer enabled.
> > > [  873.583240] Restarting tasks ... 
> > > [  873.583339] usb 1-4: USB disconnect, device number 10
> > > [  873.586356] done.
> > > [  873.604420] PM: suspend exit
> > > [  873.737283] usb 1-4: new high-speed USB device number 11 using xhci_hcd
> > > [  880.867398] usb 1-4: device descriptor read/64, error -110
> > > [  881.175558] usb 1-4: New USB device found, idVendor=1199, idProduct=a001
> > > [  881.175563] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > > [  881.175566] usb 1-4: Product: Sierra Wireless EM7345 4G LTE
> > > [  881.175568] usb 1-4: Manufacturer: Sierra Wireless Inc.
> > > [  881.175570] usb 1-4: SerialNumber: 013937002544516
> > > 
> > > Any guess what might be behind this?
> > 
> > Any chance you can run 'git bisect' to find the offending commit for
> > this issue?
> 
> It's 662591461c4b9a1e3b9b159dbf37648a585ebaae.  To my eyes, it even
> looks plausible that it's causing the problematic behaviour, but
> since I can't say I understand what I'd be doing if I dabbled with
> the change, I've refrained from guessing how to fix it.
> 
> I'm happy to try patches, though.

Ok, thanks.  I've added the authors of this patch to the email here,
perhaps they have an idea of what is going on?

greg k-h
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