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[Bug 1207409] [NEW] erro connecting more than 4 usb modems "parent hub has no TT"

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Dear Srs,

I need to connect multiple modems on the same machine but when connect more than 4 modems appears the following error "parent hub has no TT". I researched about it and saw some comments saying that this error was corrected in kernel 2.6.36.
 I always use the newest version of the kernel that is now "3.2.0-29-generic-pae # 46-Ubuntu SMP Fri Jul 27 17:25:43 UTC 2012 i686 i686 i386 GNU / Linux" but the error persists. My Ubuntu is 12.04 server,  i need help.


# cat /var/log/kern.log |grep USB

Jul 29 17:58:31  T1-server kernel: [609170.558212] ehci_hcd 0000:02:02.0: USB bus 1 deregistered
Jul 29 18:03:06  T1-server kernel: [    1.384403] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
Jul 29 18:03:06  T1-server kernel: [    1.385227] ehci_hcd 0000:02:02.0: new USB bus registered, assigned bus number 1
Jul 29 18:03:06  T1-server kernel: [    1.430995] ehci_hcd 0000:02:02.0: USB 2.0 started, EHCI 1.00
Jul 29 18:03:06  T1-server kernel: [    1.476203] hub 1-0:1.0: USB hub found
Jul 29 18:03:06  T1-server kernel: [    1.476676] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
Jul 29 18:03:06  T1-server kernel: [    1.476913] uhci_hcd: USB Universal Host Controller Interface driver
Jul 29 18:03:06  T1-server kernel: [    1.477690] uhci_hcd 0000:02:00.0: new USB bus registered, assigned bus number 2
Jul 29 18:03:06  T1-server kernel: [    1.478668] hub 2-0:1.0: USB hub found
Jul 29 18:03:06  T1-server kernel: [    2.292074] usb 1-6: new high-speed USB device number 2 using ehci_hcd
Jul 29 18:03:06  T1-server kernel: [    2.622252] hub 1-6:1.0: USB hub found
Jul 29 18:04:00  T1-server kernel: [   57.588526] usb 1-1: new high-speed USB device number 3 using ehci_hcd
Jul 29 18:04:01  T1-server kernel: [   58.312284] Initializing USB Mass Storage driver...
Jul 29 18:04:01  T1-server kernel: [   58.312456] USB Mass Storage support registered.
Jul 29 18:04:02  T1-server kernel: [   59.324587] scsi 3:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 29 18:04:05  T1-server kernel: [   62.613166] usb 1-1: USB disconnect, device number 3
Jul 29 18:04:06  T1-server kernel: [   63.149032] usb 1-2: new high-speed USB device number 4 using ehci_hcd
Jul 29 18:04:06  T1-server kernel: [   63.559088] USB Serial support registered for generic
Jul 29 18:04:07  T1-server kernel: [   64.037070] usbserial: USB Serial Driver core
Jul 29 18:04:07  T1-server kernel: [   64.038958] USB Serial support registered for GSM modem (1-port)
Jul 29 18:04:07  T1-server kernel: [   64.041995] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB0
Jul 29 18:04:07  T1-server kernel: [   64.042155] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB1
Jul 29 18:04:07  T1-server kernel: [   64.042324] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB2
Jul 29 18:04:07  T1-server kernel: [   64.042783] option: v0.7.2:USB Driver for GSM modems
Jul 29 18:04:07  T1-server kernel: [   64.549054] scsi 4:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 09:59:11  T1-server kernel: [143767.734731] usb 1-1: new high-speed USB device number 5 using ehci_hcd
Jul 31 09:59:12  T1-server kernel: [143769.114496] scsi 5:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 09:59:15  T1-server kernel: [143772.343917] usb 1-1: USB disconnect, device number 5
Jul 31 09:59:16  T1-server kernel: [143772.922616] usb 1-3: new high-speed USB device number 6 using ehci_hcd
Jul 31 09:59:16  T1-server kernel: [143773.288882] usb 1-3: GSM modem (1-port) converter now attached to ttyUSB3
Jul 31 09:59:16  T1-server kernel: [143773.289064] usb 1-3: GSM modem (1-port) converter now attached to ttyUSB4
Jul 31 09:59:16  T1-server kernel: [143773.289287] usb 1-3: GSM modem (1-port) converter now attached to ttyUSB5
Jul 31 09:59:17  T1-server kernel: [143774.314210] scsi 6:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 09:59:34  T1-server kernel: [143791.366137] usb 1-1: new high-speed USB device number 7 using ehci_hcd
Jul 31 09:59:36  T1-server kernel: [143792.754396] scsi 7:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 09:59:39  T1-server kernel: [143796.158952] usb 1-1: USB disconnect, device number 7
Jul 31 09:59:40  T1-server kernel: [143796.714104] usb 1-4: new high-speed USB device number 8 using ehci_hcd
Jul 31 09:59:40  T1-server kernel: [143797.079842] usb 1-4: GSM modem (1-port) converter now attached to ttyUSB6
Jul 31 09:59:40  T1-server kernel: [143797.079995] usb 1-4: GSM modem (1-port) converter now attached to ttyUSB7
Jul 31 09:59:40  T1-server kernel: [143797.080258] usb 1-4: GSM modem (1-port) converter now attached to ttyUSB8
Jul 31 09:59:41  T1-server kernel: [143798.122270] scsi 8:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 09:59:55  T1-server kernel: [143811.862772] usb 1-1: new high-speed USB device number 9 using ehci_hcd
Jul 31 09:59:56  T1-server kernel: [143813.234364] scsi 9:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 09:59:59  T1-server kernel: [143816.254322] usb 1-1: USB disconnect, device number 9
Jul 31 10:00:00  T1-server kernel: [143816.794671] usb 1-5: new high-speed USB device number 10 using ehci_hcd
Jul 31 10:00:00  T1-server kernel: [143817.164897] usb 1-5: GSM modem (1-port) converter now attached to ttyUSB9
Jul 31 10:00:00  T1-server kernel: [143817.165073] usb 1-5: GSM modem (1-port) converter now attached to ttyUSB10
Jul 31 10:00:00  T1-server kernel: [143817.165207] usb 1-5: GSM modem (1-port) converter now attached to ttyUSB11
Jul 31 10:00:01  T1-server kernel: [143818.182250] scsi 10:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 10:00:16  T1-server kernel: [143832.770139] usb 1-1: new high-speed USB device number 11 using ehci_hcd
Jul 31 10:00:17  T1-server kernel: [143834.134241] scsi 11:0:0:0: CD-ROM            ZTE      USB SCSI CD-ROM  2.31 PQ: 0 ANSI: 2
Jul 31 10:00:21  T1-server kernel: [143838.170582] usb 1-6.1: new full-speed USB device number 12 using ehci_hcd
Jul 31 10:00:21  T1-server kernel: [143838.450636] usb 1-6.1: new full-speed USB device number 13 using ehci_hcd
Jul 31 10:00:22  T1-server kernel: [143838.746149] usb 1-6.1: new full-speed USB device number 14 using ehci_hcd
Jul 31 10:00:22  T1-server kernel: [143839.038725] usb 1-6.1: new full-speed USB device number 15 using ehci_hcd
Jul 31 10:00:22  T1-server kernel: [143839.042798] hub 1-6:1.0: unable to enumerate USB device on port 1
Jul 31 10:00:22  T1-server kernel: [143839.046211] usb 1-1: USB disconnect, device number 11

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: bot-comment
-- 
erro connecting more than 4 usb modems "parent hub has no TT"
https://bugs.launchpad.net/bugs/1207409
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