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From: Oliver Neukum <oneukum@suse.com>
To: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: Re: ttyACM: disabled by hub (EMI?), re-enabling... Causes garbage chars & disconnect
Date: Mon, 08 Jun 2020 21:21:28 +0200	[thread overview]
Message-ID: <1591644088.24937.7.camel@suse.com> (raw)
In-Reply-To: <294b2e8330b8c04652ffbab7829dd2cbfa2cf081.camel@infinera.com>

Am Montag, den 08.06.2020, 16:00 +0000 schrieb Joakim Tjernlund:

> User space already does this, but the automatic ECHOing that happens at open
> is not possible to address in user space. The buffered chars are sent to both
> the terminal app(putty/minicom etc.) and over the wire to the shell waiting there
> and that is the problem. There is no way to prevent that ECHO back over the wire(USB)
> as the default is to ECHO and one have to open the tty to change to non ECHO.

Hi,

this is correct, but not specific to CDC-ACM. Could you ask the serial
maintainers and look at what SUS respectively POSIX have to say about
correct behavior?

	Regards
		Oliver


  reply	other threads:[~2020-06-08 19:21 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-25 14:46 ttyACM: disabled by hub (EMI?), re-enabling... Causes garbage chars & disconnect Joakim Tjernlund
2020-05-25 15:02 ` Oliver Neukum
2020-05-25 15:15   ` Joakim Tjernlund
2020-05-25 16:49     ` Joakim Tjernlund
2020-05-26  8:47       ` Oliver Neukum
2020-05-26  8:59         ` Joakim Tjernlund
2020-05-26 10:14           ` Oliver Neukum
2020-05-26 16:46             ` Joakim Tjernlund
2020-05-26 17:19               ` Joakim Tjernlund
2020-05-27  8:38                 ` Oliver Neukum
2020-05-27  9:40                   ` Joakim Tjernlund
2020-05-27 10:12                     ` Greg KH
2020-05-27 10:41                     ` Oliver Neukum
2020-05-27 13:16                       ` Joakim Tjernlund
2020-05-27 15:41                         ` Joakim Tjernlund
2020-06-05 10:09                           ` Joakim Tjernlund
2020-06-08  9:13                             ` Oliver Neukum
2020-06-08 11:39                               ` Joakim Tjernlund
2020-06-08 15:40                                 ` Oliver Neukum
2020-06-08 16:00                                   ` Joakim Tjernlund
2020-06-08 19:21                                     ` Oliver Neukum [this message]
2020-06-15 11:01           ` Joakim Tjernlund

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