lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Sun, 4 Apr 2010 21:34:06 +0200 From: Pavel Machek <pavel@....cz> To: Philippe Troin <phil@...i.org> Cc: Mohamed Ikbel Boulabiar <boulabiar@...il.com>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, linux-kernel@...r.kernel.org, linux-media@...r.kernel.org Subject: Re: webcam problem after suspend/hibernate 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists