linux-kernel - Re: Dell Inspiron 5558/0VNM2T hangs at resume from suspend when USB 3 is enabled

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Date:   Mon, 20 Mar 2017 15:27:56 -0300
From:   Diego Viola <diego.viola@...il.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     mathias.nyman@...el.com, Roger <rogerable@...ltek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Wei WANG <wei_wang@...lsil.com.cn>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        Alan Stern <stern@...land.harvard.edu>
Subject: Re: Dell Inspiron 5558/0VNM2T hangs at resume from suspend when USB 3
 is enabled

On Mon, Mar 20, 2017 at 1:32 PM, Mathias Nyman
<mathias.nyman@...ux.intel.com> wrote:
> On 20.03.2017 17:39, Diego Viola wrote:
>>
>> On Mon, Mar 20, 2017 at 11:21 AM, Mathias Nyman
>> <mathias.nyman@...ux.intel.com> wrote:
>>>
>>> On 19.03.2017 23:29, Diego Viola wrote:
>>>>
>>>>
>
>>>>> Still a problem with 4.11.0-rc2-ARCH+
>>>
>>> 4.11-rc2 has better xhci tracing, it shows each URB enqueue and dequeue
>>> and
>>> giveback.
>>>
>>> Could you try enabling xhci tracing before suspending (not the same as
>>> xhci
>>> verbose dynamic debug)
>>> It will generate a lot of data, so better to remove all extra USB
>>> devices.
>>>
>>> xhci tracing can be added with:
>>>
>>> mount -t debugfs none /sys/kernel/debug
>>> echo xhci-hcd >> /sys/kernel/debug/tracing/set_event
>>>
>>> and then send the output of cat /sys/kernel/debug/tracing/trace
>>
>>
>> https://bugzilla.kernel.org/attachment.cgi?id=255367
>>
>> This is with Linux 4.11.0-rc3-ARCH.
>>
>> USB mouse/keyboard was unplugged before booting the machine.
>>
>> I didn't do a suspend/resume before getting this trace, should I do that?
>>
>> Should I reproduce the hang and get a netconsole dmesg capture with
>> tracing enabled?
>
>
> A trace and a dmesg of the same  suspend/reusume hang would be great.

I can capture the dmesg with netconsole once the machine hangs, but
I'm not sure how I could capture /sys/kernel/debug/tracing/trace after
the hang. I'm unable to use ssh after the hang.

> And if you can then one of a succesful suspend/resume for reference.

Here's the trace after a successful suspend/resume:

https://bugzilla.kernel.org/attachment.cgi?id=255369

>
> (I haven't yet checked the one you added to bugzilla)
>
> -Mathias

Diego