Subject: Re: Dell Inspiron 5558/0VNM2T hangs at resume from suspend when USB 3
 is enabled
To: Diego Viola <diego.viola@gmail.com>
References: <CA+ToGPEquNetNW5PnTcB5p=jUwwKmp-=wgyJ7ftt+GAv=REfTQ@mail.gmail.com>
 <Pine.LNX.4.44L0.1703171221360.1854-100000@netrider.rowland.org>
 <CA+ToGPFU=JfZTFSnXyofKkZ9n13hF_TXcQCpLt_t0J8QKeRFYw@mail.gmail.com>
 <CA+ToGPG=wyotbKczGgJvuSmzFdLVaSbED05qkbFLiLF9W=Kz1A@mail.gmail.com>
 <CA+ToGPGASfrDZyuv-p0V3yVFTQ33wi8kLE+DEQ=4Dt+VJvVG4w@mail.gmail.com>
 <58CFE56C.8050906@linux.intel.com>
 <CA+ToGPFXoqfn7PyM6iDthMN0jWVC5EKUtmzc3M-gJxcy1he_nw@mail.gmail.com>
Cc: mathias.nyman@intel.com, Roger <rogerable@realtek.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Wei WANG <wei_wang@realsil.com.cn>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux USB List <linux-usb@vger.kernel.org>,
        Alan Stern <stern@rowland.harvard.edu>
From: Mathias Nyman <mathias.nyman@linux.intel.com>
Message-ID: <58D00409.7060205@linux.intel.com>
Date: Mon, 20 Mar 2017 18:32:09 +0200
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On 20.03.2017 17:39, Diego Viola wrote:
> On Mon, Mar 20, 2017 at 11:21 AM, Mathias Nyman
> <mathias.nyman@linux.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.
And if you can then one of a succesful suspend/resume for reference.

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

-Mathias