Messages in this thread | | | Date | Sun, 4 Apr 2010 21:34:06 +0200 | From | Pavel Machek <> | Subject | Re: webcam problem after suspend/hibernate |
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Hi!
> > If unload/reload of uvcvideo helps, it is most likely problem in that. > > > > If unload/reload of ehci_hcd is needed, it is most likely ehci problem. > > My testing shows that: > > 1. If I remove uvcvideo BEFORE suspend and reinsert it after resume, > it works. However, I cannot always rmmod uvcvideo before suspend > as it may be in use. > > 2. As a work around, removing ehci_hcd and reinserting ehci_hcd upon > resume works as well. > > 3. Since my distribution's kernels come with ehci_hcd built into the > kernel, and I cannot do #2 any more, I also found that unbinding > and rebinding the device (with the script I sent earlier on) works > as well. > > I think uvcvideo is failing to reinitialize the camera on resume, and > forcing an uvcvideo "reset" with either of these three methods kicks > uvcvideo into working again.
Ok, that puts the problem firmly into uvcvideo area.
Try changing its _resume routine to whatever is done on device unplug... it should be rather easy, and is quite close to "correct" solution.
Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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