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[Kenneth Boyd <204857@xxxxxxxxxxxxxxxxxx>]

Just got to say, I had this problem with Lubuntu - and it seems to be
solved if you wrap the usb cable around some ferrite - there may be
interference when a usb hard drive or other high emi device is plugged
in or activated that sends the hub into a state of panic. Might be worth
a shot .... worked for me :)

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https://bugs.launchpad.net/bugs/204857

Title:
  USB port disabled by hup (EMI? re enabling)

Status in “linux” package in Ubuntu:
  Fix Released
Status in “mythtv” package in Ubuntu:
  Won't Fix
Status in “yelp” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: yelp

  Description:	Ubuntu hardy (development branch)
  Release:	8.04 (amd64)
  Mainboard  is based on amd690G chipset.

  I have been trying to get my SUB DBV-tuner to work, I have consulted
  v4l-dvb-users list and drivers are compiled ok and TV-usb-card is
  initialized correctly.

  But when i issue a scan i get these strange usb disconnects /
  reconnect errors in syslog:

  [ 2079.556854] dib0700: firmware started successfully.
  [ 2079.757650] dvb-usb: found a 'Pinnacle PCTV 72e DVB-T' in warm state.
  [ 2079.757709] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
  [ 2079.757850] DVB: registering new adapter (Pinnacle PCTV 72e DVB-T)
  [ 2079.982150] dvb_register_frontend
  [ 2079.982158] DVB: registering frontend 0 (DiBcom 7000PC)...
  [ 2080.165536] DiB0070: successfully identified
  [ 2080.165546] dvb-usb: Pinnacle PCTV 72e DVB-T successfully initialized and connected.
  [ 2164.220052] dvb_frontend_open
  [ 2164.220058] dvb_frontend_start
  [ 2164.220474] dvb_frontend_ioctl
  [ 2164.220477] dvb_frontend_thread
  [ 2164.220479] DVB: initialising frontend 0 (DiBcom 7000PC)...
  [ 2164.236503] dvb_frontend_ioctl
  [ 2164.236509] dvb_frontend_add_event
  [ 2164.236055] dvb_frontend_swzigzag_autotune: drift:0 inversion:0 auto_step:0 auto_sub_step:0 started_auto_step:0
  [ 2164.316402] dvb_frontend_ioctl

   // I think THIS is the cause of the problem
  [ 2164.504843] hub 6-3:1.0: port 7 disabled by hub (EMI?), re-enabling...
  [ 2164.504890] usb 6-3.7: USB disconnect, address 4

  
  [ 2164.505094] dvb_unregister_frontend
  [ 2164.505096] dvb_frontend_stop
  [ 2170.886982] dvb-usb: error while stopping stream.
  [ 2170.887011] dvb_frontend_release
  [ 2170.887343] dvb-usb: Pinnacle PCTV 72e DVB-T successfully deinitialized and disconnected.
  [ 2170.916174] usb 6-3.7: new high speed USB device using ehci_hcd and address 5
  [ 2170.953302] usb 6-3.7: configuration #1 chosen from 1 choice
  [ 2170.953464] dvb-usb: found a 'Pinnacle PCTV 72e DVB-T' in warm state.
  [ 2170.953503] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
  [ 2170.953617] DVB: registering new adapter (Pinnacle PCTV 72e DVB-T)

  I already tried to disable usb autosusbend with good no results (find some issues related to this with google):
  put this in rc.local:
  echo -1 > /sys/module/usbcore/parameters/autosuspend
  sleep 1
  /usr/sbin/lsusb

  Is this is a kernel bug?

  ProblemType: Bug
  Architecture: amd64
  Date: Fri Mar 21 23:59:33 2008
  DistroRelease: Ubuntu 8.04
  ExecutablePath: /usr/bin/yelp
  Package: yelp 2.22.0-0ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
   LANG=fi_FI.UTF-8
   SHELL=/bin/bash
  SourcePackage: yelp
  Uname: Linux 2.6.24-12-generic x86_64

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