From: Greg KH <gregkh@linuxfoundation.org>
To: Jorge Fernandez Monteagudo <jorgefm@cirsa.com>
Cc: "kernelnewbies@kernelnewbies.org" <kernelnewbies@kernelnewbies.org>
Subject: Re: USB resets
Date: Tue, 20 Apr 2021 10:52:43 +0200 [thread overview]
Message-ID: <YH6WW1Kqa5oUx4Ft@kroah.com> (raw)
In-Reply-To: <DB9PR10MB45227775A4DB103122C71F5CA1489@DB9PR10MB4522.EURPRD10.PROD.OUTLOOK.COM>
On Tue, Apr 20, 2021 at 07:41:14AM +0000, Jorge Fernandez Monteagudo wrote:
> >Bad hardware, the kernel can not cause a disconnect :(
> >
> >Do you have a flaky cable or underpowerd hub here?
> >
>
> How many retries before the kernel decides to send a reset to a USB device? After a reset, this device is ignored?
The hub itself disconnects the device electronically, the kernel does
not do that. When the device comes back, then it is initialized by the
kernel, as the logs show, but then it is disconnected again.
This really looks like broken hardware or electronic noise on the
connection, the kernel can not cause electronic disconnects on a USB hub
like this.
good luck!
greg k-h
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next prev parent reply other threads:[~2021-04-20 8:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 7:17 USB resets Jorge Fernandez Monteagudo
2021-04-20 7:22 ` Greg KH
2021-04-20 7:41 ` Jorge Fernandez Monteagudo
2021-04-20 8:52 ` Greg KH [this message]
2021-04-22 7:32 ` Jorge Fernandez Monteagudo
2021-04-22 8:03 ` Greg KH
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