[Bug 554263] Re: [uvcvideo causes ehci_hcd to force halt]Trying to use built-in webcam in certain notebooks/laptops breaks other USB devices

[Andreas Modinos]

** Description changed:

- Lucid Lynx (10.04) Beta
+ Lucid Lynx (10.04)
  Karmic Koala (9.10)
  
- A conflict between the web cam and (built-in) wireless USB adapter seems to be taking place.
- Steps to repeat on affected machines:
+ To recreate run Cheese, Ekiga or aMSN (basically anything that will try
+ to use the webcam).
  
- Run cheese (or any other app that tries to use the web cam such as
- Ekiga, aMSN, etc.)
+ Symptoms:
  
- What happens:
- 1. Wireless adapter will immediately disconnect after which NetworkManager will just display 'device not ready'
- 2. Suspend and/or hibernate will also fail if attempted.
- 3. Removing and reinserting the web cam and/or wireless module will not restore system functionality, has to be rebooted.
+ 1. Obviously the webcam does not work.
+ 2. Dmesg output that looks like this:
+ [ 979.810911] ehci_hcd 0000:00:13.5: force halt; handhake ffffc90000364424 00004000 00000000 -> -110
+ 3. Wireless adapter will immediately disconnect after which NetworkManager will just display 'device not ready'
+ (this happens when your built-in wireless is an internal USB device)
+ 4. Suspend and/or hibernate _might_ fail if attempted.
+ 5. In some cases inserting a memory stick or other USB storage will not work any more.
  
- This is a regression since Ubuntu 9.04 where this web cam worked
- perfectly.
+ Rebooting is necessary to fix the other USB devices.
+ 
+ This bug seems to affect varied models of the Toshiba Satellite line as
+ well as some other notebooks. So far a commonality between the different
+ cases seems to be that they all use Chicony webcams and in cases where
+ the wireless fails, the wireless adapter is also a USB device. I am
+ collecting a list of device ids from other reporters and duplicates to
+ this file: http://www.saunalahti.fi/~amodinos/andreas/bug554263.txt
+ 
+ For me this is a regression since Ubuntu 9.04.
+ 
+ Possible work-arounds:
+ 1) Don't use the webcam: add 'blacklist uvcvideo' to /etc/modprobe.d/blacklist.conf
+ 2) Unblacklist usbmouse and usbkbd by commenting them out (based on bug 435352 comment #36)
+ 
+ Other references:
+ http://www.mail-archive.com/linux-media@vger.kernel.org/msg10598.html
  
  -- INFO FOR BUG POSTERS --
- This bug seems to affect varied models of the Toshiba Satellite line so to make it easier for devs to troubleshoot I suggest you do the following:
+ To make this easier for devs to troubleshoot I suggest you do the following:
  
  1. Make the bug happen.
  2. To attach the relevant data to this bug report, open a terminal in (Applications->Accessories->Terminal) and type the following command: apport-cli -f -p linux
  3. Follow the instructions on screen and at the end when it asks what to do with the report, tell apport to save the file.
  After this, you will have a file in /tmp that might look like this: apport.linux-image-2.6.32-19-generic.wRN7Qd.apport
  4. Copy the report file to your home folder and reboot.
  5. Once online you can leave a message here with the full name/model of your notebook and the generated report file as an attachment to that message!
  
  If these instructions are followed there will be no need to post bits
  and pieces of information separately.

** Tags removed: hw-specific

-- 
[uvcvideo causes ehci_hcd to force halt]Trying to use built-in webcam in certain notebooks/laptops breaks other USB devices
https://bugs.launchpad.net/bugs/554263
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