On Fri, 22 Sep 2006, Andrey Borzenkov wrote: > > It's the usual case of fixing one bug triggering another, in your case > > because the fix ran into a previously unseen hardware bug. One other > > way to work around that bug would be disabling CONFIG_PM, but I suspect > > you don't want to go that route... > > > > > Here you are. I am still puzzled where all these "suspends" come from - I > > > did not try any suspend in the meantime ... > > > > It's the driver putting the controller into a low power state. Your > > hardware seems to have a bug whereby that doesn't work correctly, > > making it immediately leave that state. (And the driver messaging is > > fine for what should be an uncommon event; plus it highlighted your > > hardware bug.) Notice the "initreset quirk" message -- another bug > > in that hardware. Workarounds in both cases are simple. > > > > When I get a moment, I'll have a patch for you to try. Meanwhile, > > either workaround I showed above should prevent the attempt to enter > > that low power mode. > > > > > I updated to 2.6.18 and got the same issue; any patch to try?
> > > ohci_hcd 0000:00:02.0: suspend root hub > > > hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000, resume root > > > hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000 > > > ohci_hcd 0000:00:02.0: suspend root hub > > > hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000, resume root > > > hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000 > > > ohci_hcd 0000:00:02.0: suspend root hub > > > hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000, resume root > > > hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000 > > > ohci_hcd 0000:00:02.0: suspend root hub > > > > .... etc I had to add special code in uhci-hcd for controllers where the resume-detect mechanism was broken. When the root hub on one of those bad machines is suspended, the driver uses polling instead of interrupts to detect port status changes. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
