Path: csiph.com!goblin2!goblin.stu.neva.ru!newsfeed.xs4all.nl!newsfeed8.news.xs4all.nl!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!newsgate.news.xs4all.nl!nzpost1.xs4all.net!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'repository': 0.05; 'url:launchpad': 0.05; 'versions,': 0.05; 'works.': 0.07; 'creighton': 0.09; 'fix.': 0.09; 'fixed,': 0.09; 'logic': 0.09; 'read()': 0.09; 'received:openend.se': 0.09; 'received:theraft.openend.se': 0.09; 'bug': 0.10; '>in': 0.16; '>to': 0.16; 'from:addr:lac': 0.16; 'from:addr:openend.se': 0.16; 'from:name:laura creighton': 0.16; 'message-id:@fido.openend.se': 0.16; 'rather,': 0.16; 'reboot': 0.16; 'received:fido': 0.16; 'received:fido.openend.se': 0.16; 'skip:> 20': 0.16; 'url:linux': 0.16; 'laura': 0.18; 'working.': 0.18; 'changes': 0.20; '2015': 0.20; 'tracker': 0.20; 'fix': 0.21; 'do.': 0.22; 'sat,': 0.23; 'url:bugs': 0.24; 'installed': 0.26; 'error': 0.27; 'fri,': 0.27; 'order.': 0.27; '+0200,': 0.27; 'object,': 0.27; 'to?': 0.27; 'correct': 0.28; 'device': 0.28; 'behaviour': 0.29; 'received:se': 0.29; 'thinks': 0.29; "i'm": 0.30; 'that.': 0.30; 'url:mailman': 0.30; 'code': 0.30; 'regardless': 0.31; 'users.': 0.31; 'anyone': 0.32; 'up.': 0.32; 'maybe': 0.33; 'changed': 0.33; 'url:python': 0.33; 'ubuntu': 0.33; 'url:listinfo': 0.34; 'running': 0.34; 'skip:3 10': 0.35; 'happened': 0.35; 'skip:> 10': 0.35; 'stopped': 0.35; 'but': 0.36; 'there': 0.36; 'url:org': 0.36; 'url:source': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'method': 0.37; 'charset:us-ascii': 0.37; 'seem': 0.37; 'things': 0.38; 'reports': 0.38; 'data': 0.39; 'along': 0.39; 'subject:-': 0.39; 'url:mail': 0.40; 'to:addr:python.org': 0.40; 'some': 0.40; 'address': 0.61; 'header:Message-Id:1': 0.61; 'between': 0.65; 'talking': 0.67; 'serial': 0.70; 'header:In-reply-to:1': 0.84; 'prolific': 0.84; 'readiness': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=openend.se; s=default; t=1443863549; bh=Xce8Vh9G5HLklb30XAYiY0hnL1QCql3tStLCRzFx+Wo=; h=To:From:Subject:In-reply-to:References:Date:From; b=nW2yo4RaCNy5ie7nBAYel6xXBscXqgTwrfjcRKQWk/iJ8OxNsu+BHCL/czfsQnnTm 67oOf6MEp4/BHKTpHqvu6vtSwblFcg8x1C+u1Neu3rznDq0lzYZOKx2TDK0O6CjrYR SDDeCR5cfrY/ZD6nflYtc0z7UGbP1H1RjJD+JLP0= To: python-list@python.org From: Laura Creighton Subject: Re: Pyserial and Ubuntu Linux kernel 3.13.0-65-generic In-reply-to: <201510030907.t93974tU002535@fido.openend.se> References: <201510030907.t93974tU002535@fido.openend.se> Comments: In-reply-to Laura Creighton message dated "Sat, 03 Oct 2015 11:07:04 +0200." MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3121.1443863548.1@fido> Date: Sat, 03 Oct 2015 11:12:28 +0200 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.3.9 (theraft.openend.se [82.96.5.2]); Sat, 03 Oct 2015 11:12:29 +0200 (CEST) X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 54 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1443863551 news.xs4all.nl 23776 [2001:888:2000:d::a6]:51507 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:97365 In a message of Sat, 03 Oct 2015 11:07:04 +0200, Laura Creighton writes: >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 >-- >https://mail.python.org/mailman/listinfo/python-list I think I said that poorly. What I think happened is that ubuntu made some changes to fix this problem, and along the way they managed to break things for you, and maybe all pyserial users. But I would talk to the pyserial people about that. Laura