{"id":199,"date":"2012-05-15T10:42:57","date_gmt":"2012-05-15T10:42:57","guid":{"rendered":"http:\/\/rglinuxtech.com\/?p=199"},"modified":"2012-05-15T10:42:57","modified_gmt":"2012-05-15T10:42:57","slug":"the-pi-hub-power-saga-running-with-scissors","status":"publish","type":"post","link":"https:\/\/rglinuxtech.com\/?p=199","title":{"rendered":"The Pi \/ Hub \/ Power Saga &#8211; Running with Scissors.."},"content":{"rendered":"<p>Another option I just tried turned nasty very quickly&#8230;\u00a0\u00a0\u00a0 I wondered what would happen if all external USB devices were connected via the (powered) hub, but the answer was soon apparent:<\/p>\n<address>usb 1-1.3.1.1: reset low speed USB device number 6 using dwc_otg<br \/>\nusb 1-1.3.1.2: reset full speed USB device number 7 using dwc_otg<br \/>\nINFO:: periodic_channel_available: Total channels: 8, Periodic: 7, Non-periodic: 1<br \/>\nINFO:: schedule_periodic: No host channel available for periodic transfer.<br \/>\nERROR::dwc_otg_hcd_urb_enqueue:487: DWC OTG HCD URB Enqueue failed adding QTD. Error status -4008<br \/>\nINFO:: periodic_channel_available: Total channels: 8, Periodic: 7, Non-periodic: 1<br \/>\nINFO:: schedule_periodic: No host channel available for periodic transfer.<br \/>\nERROR::dwc_otg_hcd_urb_enqueue:487: DWC OTG HCD URB Enqueue failed adding QTD. Error status -4008<br \/>\nINFO:: periodic_channel_available: Total channels: 8, Periodic: 7, Non-periodic: 1<br \/>\nINFO:: schedule_periodic: No host channel available for periodic transfer.<br \/>\nERROR::dwc_otg_hcd_urb_enqueue:487: DWC OTG HCD URB Enqueue failed adding QTD. Error status -4008<br \/>\nINFO:: periodic_channel_available: Total channels: 8, Periodic: 7, Non-periodic: 1<br \/>\nINFO:: schedule_periodic: No host channel available for periodic transfer.<br \/>\nERROR::dwc_otg_hcd_urb_enqueue:487: DWC OTG HCD URB Enqueue failed adding QTD. Error status -4008<\/address>\n<address>\u00a0<\/address>\n<p>&#8211; repeated ad nauseam&#8230;<\/p>\n<p>Well, at least I have now seen some new and different Linux error messages!<\/p>\n<p>Another rather worrying observation was that the red led stayed <em><strong>on<\/strong><\/em> when the Pi &#8216;power&#8217; was disconnected while the (powered) USB hub was still connected..<\/p>\n<p>I think I&#8217;ll leave all this for the time being, and check the Pi Forum for any <em>practical<\/em> suggestions&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Another option I just tried turned nasty very quickly&#8230;\u00a0\u00a0\u00a0 I wondered what would happen if all external USB devices were connected via the (powered) hub, but the answer was soon apparent: usb 1-1.3.1.1: reset low speed USB device number 6 using dwc_otg usb 1-1.3.1.2: reset full speed USB device number 7 using dwc_otg INFO:: periodic_channel_available: Total channels: <span class=\"excerpt-dots\">&hellip;<\/span> <a class=\"more-link\" href=\"https:\/\/rglinuxtech.com\/?p=199\"><span class=\"more-msg\">Continue reading &rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[6,11,19,20,21],"tags":[144,148,306,313,389],"class_list":["post-199","post","type-post","status-publish","format-standard","hentry","category-crash-and-burn","category-hacks","category-opinion","category-performance-2","category-raspberry-pi","tag-error-status-4008","tag-fail","tag-problems","tag-raspberry-pi-2","tag-usb-hub"],"_links":{"self":[{"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=\/wp\/v2\/posts\/199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=199"}],"version-history":[{"count":0,"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=\/wp\/v2\/posts\/199\/revisions"}],"wp:attachment":[{"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rglinuxtech.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}