Fwd: Re: [Linux-uvc-devel] BisonCam 5986:0203 kills USB

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Linux USB developers,
  Laurent has suggested to contact you with the matter at hand, please see below!

Subject: Re: [Linux-uvc-devel] BisonCam 5986:0203 kills USB
From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
To: linux-uvc-devel@xxxxxxxxxxxxxxxx
> On Tuesday 10 November 2009 16:59:04 Stephan Diestelhorst wrote:
> > This issue is with the built-in Bison web cam in an MSI Wind
> > U100. Once the camera is enabled (via hotkey), the entire USB
> > subsystem is not responding anymore, causing non-detection of
> > freshly attached USB devices and prevents suspending the box.
> > 
> > The only fix so far is to blacklist the "uvcvideo" module or to
> > keep the cam disabled (with hotkey).
> > 
> > This is with a stable 2.6.31-14-generic kernel on Ubuntu Karmic.
> > 
> > A number of related resources:
> >   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/435352 contains
> > many user reports.
> > 
> >   http://marc.info/?l=linux-kernel&m=125541673726384&w=2 a stalled
> > discussion on the LKML with more technical insight
> > 
> >  https://lists.berlios.de/pipermail/linux-uvc-devel/2009-September/005143.html
> >  a stalled discussion on the linux-uvc-devel ML
> >  
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=04a37e0f32f9882430bc1899899d2ed91b8aaf5bis
> > (according to launchpad) the breaking changeset.
> > 
> > This is a very unpleasant bug, as it affects the usability of the
> > system a lot and is a regression: Kernel 2.6.28 worked flawless
> > with the webcam.
> 
> Even though the git commit that caused the regression modifies the
> uvcvideo driver, this is an issue that need to be solved at the USB
> core level. The commit's purpose is to enable autosuspend, but a
> nasty side effect kills USB on some (buggy ?) controllers because an
> interrupt URB is canceled too fast after being submitted.
> 
> > Many thanks and again, sorry for cross-posting,
> 
> Once again no apologize needed. You should keep cross-posting and
> report the problem to the linux-usb mailing list. I'm not familiar
> enough with the EHCI architecture to work on a fix, so the solution
> will likely come from linux-usb developers.

Any help?

Many thanks,
  Stephan
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux