{"action":"created","issue":{"url":"https://api.github.com/repos/arduino/Arduino/issues/3928","labels_url":"https://api.github.com/repos/arduino/Arduino/issues/3928/labels{/name}","comments_url":"https://api.github.com/repos/arduino/Arduino/issues/3928/comments","events_url":"https://api.github.com/repos/arduino/Arduino/issues/3928/events","html_url":"https://github.com/arduino/Arduino/issues/3928","id":110147216,"number":3928,"title":"Arduino IDE serial ports not working on EL Capitan OSX","user":{"login":"HBRancher","id":15008105,"avatar_url":"https://avatars.githubusercontent.com/u/15008105?v=3","gravatar_id":"","url":"https://api.github.com/users/HBRancher","html_url":"https://github.com/HBRancher","followers_url":"https://api.github.com/users/HBRancher/followers","following_url":"https://api.github.com/users/HBRancher/following{/other_user}","gists_url":"https://api.github.com/users/HBRancher/gists{/gist_id}","starred_url":"https://api.github.com/users/HBRancher/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/HBRancher/subscriptions","organizations_url":"https://api.github.com/users/HBRancher/orgs","repos_url":"https://api.github.com/users/HBRancher/repos","events_url":"https://api.github.com/users/HBRancher/events{/privacy}","received_events_url":"https://api.github.com/users/HBRancher/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/arduino/Arduino/labels/OS:%20OSX","name":"OS: OSX","color":"808080"}],"state":"closed","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/arduino/Arduino/milestones/15","html_url":"https://github.com/arduino/Arduino/milestones/Release%201.6.6","labels_url":"https://api.github.com/repos/arduino/Arduino/milestones/15/labels","id":1158070,"number":15,"title":"Release 1.6.6","description":"","creator":{"login":"ffissore","id":510465,"avatar_url":"https://avatars.githubusercontent.com/u/510465?v=3","gravatar_id":"","url":"https://api.github.com/users/ffissore","html_url":"https://github.com/ffissore","followers_url":"https://api.github.com/users/ffissore/followers","following_url":"https://api.github.com/users/ffissore/following{/other_user}","gists_url":"https://api.github.com/users/ffissore/gists{/gist_id}","starred_url":"https://api.github.com/users/ffissore/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ffissore/subscriptions","organizations_url":"https://api.github.com/users/ffissore/orgs","repos_url":"https://api.github.com/users/ffissore/repos","events_url":"https://api.github.com/users/ffissore/events{/privacy}","received_events_url":"https://api.github.com/users/ffissore/received_events","type":"User","site_admin":false},"open_issues":0,"closed_issues":868,"state":"closed","created_at":"2015-06-10T07:48:32Z","updated_at":"2015-12-14T10:27:31Z","due_on":null,"closed_at":"2015-11-04T07:39:53Z"},"comments":38,"created_at":"2015-10-07T03:45:40Z","updated_at":"2015-12-30T20:16:36Z","closed_at":"2015-10-26T18:58:00Z","body":"Anyone know how to fix Arduino IDE serial port lockup on EL Capitan OSX ??\r\nThanks"},"comment":{"url":"https://api.github.com/repos/arduino/Arduino/issues/comments/168067265","html_url":"https://github.com/arduino/Arduino/issues/3928#issuecomment-168067265","issue_url":"https://api.github.com/repos/arduino/Arduino/issues/3928","id":168067265,"user":{"login":"PaulStoffregen","id":965463,"avatar_url":"https://avatars.githubusercontent.com/u/965463?v=3","gravatar_id":"","url":"https://api.github.com/users/PaulStoffregen","html_url":"https://github.com/PaulStoffregen","followers_url":"https://api.github.com/users/PaulStoffregen/followers","following_url":"https://api.github.com/users/PaulStoffregen/following{/other_user}","gists_url":"https://api.github.com/users/PaulStoffregen/gists{/gist_id}","starred_url":"https://api.github.com/users/PaulStoffregen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/PaulStoffregen/subscriptions","organizations_url":"https://api.github.com/users/PaulStoffregen/orgs","repos_url":"https://api.github.com/users/PaulStoffregen/repos","events_url":"https://api.github.com/users/PaulStoffregen/events{/privacy}","received_events_url":"https://api.github.com/users/PaulStoffregen/received_events","type":"User","site_admin":false},"created_at":"2015-12-30T20:16:36Z","updated_at":"2015-12-30T20:16:36Z","body":"FWIW, we've been seeing problems with Teensy when using USB Serial at high data rates with El Capitan.  Here's the conversation.\r\n\r\nhttps://forum.pjrc.com/threads/31043-Teensyduino-1-26-Beta-1-Available?p=89113&viewfull=1#post89113\r\n\r\nA couple weeks ago I put some serious effort into investigating the issue with a USB protocol analyzer.  I'm afraid the news is not good (at least for El Capitan).  All the data was being properly sent, with nothing unusual on the USB cable corresponding to the occasional data loss seen my programs running on El Capitan.  I tried adding code to occasionally send a ZLP within long sequences of full size packets as a possible workaround, but unfortunately that made no difference.\r\n\r\nThis rapid data flow problem may be completely unrelated to all the problems above."}}