[sf-lug] After waking from suspend, USB devices are not recognized (Ubuntu 17.10)

Michael Shiloh michaelshiloh1010 at gmail.com
Thu Nov 23 10:28:09 PST 2017

Interesting observation Akkana. In my case unplugging and plugging has no
effect, but your suggestion of researching Lenovo power management is a
great idea.


On Thu, Nov 23, 2017 at 9:04 PM, Akkana Peck <akkana at shallowsky.com> wrote:

> Michael Shiloh writes:
> > I noticed that my old mouse didn't work all the time, and figured it was
> > time to replace the mouse. Then I had trouble programming some Arduinos,
> > and figured I had a bad Arduino. It wasn't until my system failed to see
> a
> > thumb drive that I finally realized the common element here: After waking
> > from suspend, no devices plugged in to the USB ports are recognized.
> [ ... ]
> > $ lspci -nnk | grep -A2 USB
> > 00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 3.0
> > xHCI Controller [8086:9d2f] (rev 21)
> >     Subsystem: Lenovo Sunrise Point-LP USB 3.0 xHCI Controller
> [17aa:2238]
> Don't know how much this will help, but I had weird sporadic
> problems with an external mouse on my Lenovo X201. After suspend it
> would (seemingly) randomly stop working. I finally narrowed it down:
> When it was docked but running on battery power, and only after a
> suspend, the machine would stop listening to the mouse after a
> period of inactivity. Unplugging and replugging the mouse would fix it,
> as would clicking a mouse button, but simply moving the mouse did
> nothing. I think it's some kind of Lenovo power management cleverness
> (not), and since I notice you're also on Lenovo, it might be related.
> I never did find a fix, so now I keep the X201 plugged in when it's
> in the dock using the external mouse. Sounds like your problem is
> worse, but knowing that Lenovo plays funky power management games
> might help in searching for a solution.
>         ...Akkana
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