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Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic

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To Rob Gaddi <rgaddi@technologyhighland.invalid>
cc python-list@python.org, lac@openend.se
From Laura Creighton <lac@openend.se>
Subject Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic
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Comments In-reply-to Rob Gaddi <rgaddi@technologyhighland.invalid> message dated "Fri, 02 Oct 2015 22:36:23 -0000."
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In a message of Fri, 02 Oct 2015 22:36:23 -0000, Rob Gaddi writes:
>So, this is odd.  I'm running Ubuntu 14.04, and my system did a kernel 
>upgrade from the repository from 3.13.0-63-generic to 3.13.0-65-generic.  
>And pyserial (2.7, installed through pip) stopped working.
>
>Specifically, when I make read() calls on a Serial object, I get the error
>
>serial.serialutil.SerialException: device reports readiness to read but 
>returned no data (device disconnected?)
>
>This comes from the PosixSerial.read() method in serialposix.py, and 
>seems to be a result of the select.select call screwing up.
>
>I reboot under 3.13.0-63-generic.  My code works.  I reboot under 
>3.13.0-65-generic.  My code doesn't.  Implication would seem to be that 
>somehow between these kernel versions, the select() logic in the serial 
>driver changed.  This happens regardless of whether the serial port is 
>real, FTDI USB-UART, or Prolific USB-UART.
>
>Can anyone else confirm?  Also, who do I try to report this one to?
>
>Thanks,
>Rob
>
>-- 
>Rob Gaddi, Highland Technology -- www.highlandtechnology.com
>Email address domain is currently out of order.  See above to fix.
>-- 
>https://mail.python.org/mailman/listinfo/python-list

I think you have this bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/460857

or rather, you like the behaviour that ubuntu thinks is buggy,
which never got fixed, and don't like that it changed to be
what ubuntu thinks is correct in .65.

I'd talk to the pyserial issue tracker as the people there ought
to be well aware of this problem, and then see if talking to
ubuntu is the right thing to do.

Laura

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Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Rob Gaddi <rgaddi@technologyhighland.invalid> - 2015-10-02 22:36 +0000
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Grant Edwards <invalid@invalid.invalid> - 2015-10-02 23:36 +0000
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Laura Creighton <lac@openend.se> - 2015-10-03 11:07 +0200
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Laura Creighton <lac@openend.se> - 2015-10-03 11:12 +0200
    Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Rob Gaddi <rgaddi@technologyhighland.invalid> - 2015-10-05 16:34 +0000
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Laura Creighton <lac@openend.se> - 2015-10-03 11:19 +0200
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Michael Torrie <torriem@gmail.com> - 2015-10-03 08:38 -0600
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Laura Creighton <lac@openend.se> - 2015-10-03 18:23 +0200
    Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Grant Edwards <invalid@invalid.invalid> - 2015-10-06 21:31 +0000
      Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Rob Gaddi <rgaddi@technologyhighland.invalid> - 2015-10-06 21:46 +0000
      Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Laura Creighton <lac@openend.se> - 2015-10-06 23:51 +0200
  Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic Dave Farrance <df@see.replyto.invalid> - 2015-10-07 09:29 +0100

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