linux-kernel - Re: [RFC RESEND PATCH 0/1] USB EHCI: repeated resets on full and low speed devices

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Message-ID: <20200901163602.GG587030@rowland.harvard.edu>
Date:   Tue, 1 Sep 2020 12:36:02 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     gregkh@...uxfoundation.org, erkka.talvitie@...cit.fi,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC RESEND PATCH 0/1] USB EHCI: repeated resets on full and low
 speed devices

On Tue, Sep 01, 2020 at 09:15:46AM -0700, Khalid Aziz wrote:
> On 8/31/20 8:31 PM, Alan Stern wrote:
> > Can you collect a usbmon trace showing an example of this problem?
> > 
> 
> I have attached usbmon traces for when USB hub with keyboards and mouse
> is plugged into USB 2.0 port and when it is plugged into the NEC USB 3.0
> port.

The usbmon traces show lots of errors, but no Clear-TT events.  The 
large number of errors suggests that you've got a hardware problem; 
either a bad hub or bad USB connections.

Alan Stern