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

Michael Shiloh michaelshiloh1010 at gmail.com
Thu Nov 23 11:19:41 PST 2017

Hi Bobbie,

Thanks for the tip. Unplugging and plugging in again seems to have no
effect. Once it's dead, it stays dead until I reboot.


On Thu, Nov 23, 2017 at 10:45 PM, Bobbie Sellers <
bliss-sf4ever at dslextreme.com> wrote:

> On 11/23/2017 10:28 AM, Michael Shiloh wrote:
>> Interesting observation Akkana. In my case unplugging and plugging has no
>> effect, but your suggestion of researching Lenovo power management is a
>> great idea.
>> Thanks,
>> Michael
>> 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
>>>             I think the USB disconnect is a common phenomena as I
> observe it here in the
> case of my mouse and to a lesser degree the keyboard which are both
> plugged into
> a 3 port USB un-powered USB hub which is plugged into the computer. I see
> this
> most often with the mouse and find that unplugging it when it fails to
> respond
> and re-plugging it may restore function either immediately or after a few
> moments.
> I also have a mouse pad on the laptop's keyboard which remains usable.
> This was observed on the Pavilion notebook as well as the Dell laptop.
>             bliss
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