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To: =?UTF-8?B?RGF2aWQgV2FuZyAo546L5oyv5a6HKQ==?= <DavidWang@quantatw.com>,
 "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
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From: Johnathan Mantey <johnathanx.mantey@intel.com>
Subject: Re: ANSI Escape sequence unexpected output
Message-ID: <47e7db9c-f07d-0b27-5e38-328fb6ba3d53@intel.com>
Date: Thu, 18 Feb 2021 09:00:52 -0800
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From: Johnathan Mantey <johnathanx.mantey@intel.com>
To: =?UTF-8?B?RGF2aWQgV2FuZyAo546L5oyv5a6HKQ==?= <DavidWang@quantatw.com>,
 "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Message-ID: <47e7db9c-f07d-0b27-5e38-328fb6ba3d53@intel.com>
Subject: Re: ANSI Escape sequence unexpected output
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David,
I see a garbage sequence like this all the time.

I run an Expect script that controls my terminal emulator (kermit), and=20
I see a sequence like this:
[[39;88R
I have tried multiple times to have Expect eat or delete this output=20
before handing control to my terminal emulator.
Once Expect hands control I see:
;88R

I have also tried modifying settings in my terminal emulator to see if=20
the ANSI sequence would be eaten by the terminal emulator. This has also =

been ineffective.

So once my Expect script has handed control to me, I have to manually=20
press CR to clear the excess bytes.
This gives me an error message from Bash:
-sh: syntax error near unexpected token `;'

So I know the characters are in the Bash input stream.
Like you, I have no idea where they are coming from, and all my=20
mitigation attempts have failed.

None of my compatriots have the issue, so far as I know. When I brought=20
this to the attention of some of my team members, none claimed to have=20
the same issue. As my toolset is the outlier in the group, I just=20
resigned myself to suffering with the issue.

On 2/17/21 11:11 PM, David Wang (=A4=FD=AE=B6=A6t) wrote:
> Hi all,
>      when I use the host console via uart to log in to os, sometimes so=
me unexpected output is print to stdout, such as:
>
> login: root
> Password:
> Last Login:  Thu   Jan   7  06:52:18  UTC  2021  on ttyS0
> root@intel-corei7-64:~#  ;153R     <-------  This is the unexpected out=
put
>
> It also happen when using obmc-console-client or ipmitool sol activate.=

> It looks like an ANSI Escape sequence
> "EscLine;ColumnR	Response: cursor is at v,h	CPR"
> ref: http://ascii-table.com/ansi-escape-sequences-vt-100.php
> ref: https://stackoverflow.com/questions/16026858/reading-the-device-st=
atus-report-ansi-escape-sequence-reply
>
> My question is,
> how to prevent this escape sequence from printing to the stdout?
> Which package in openbmc is doing this?
> Has anyone had a similar problem?
> Please leave any comments.
> Thanks
>
> David
>

--=20
Johnathan Mantey
Senior Software Engineer
*azad te**chnology partners*
Contributing to Technology Innovation since 1992
Phone: (503) 712-6764
Email: johnathanx.mantey@intel.com <mailto:johnathanx.mantey@intel.com>



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