On Thursday, 14 September 2006 17:04, Alan Stern wrote: > On Thu, 14 Sep 2006, Rafael J. Wysocki wrote: > > > > > Try adding some ehci_dbg() lines in there (copy the form of the line just > > > > after restart:). We want to follow the value of > > > > hcd->self.root_hub->state. Initially it should be equal to > > > > USB_STATE_SUSPENDED (= 8), and it shouldn't change. But somewhere it is > > > > getting set to USB_STATE_CONFIGURED (= 7). I don't know where, but almost > > > > certainly somewhere in this routine. If you can find out where that > > > > happens, I'd appreciate it. > > > > > > Done, but it shows hcd->self.root_hub->state is already 7 right after restart. > > > > BTW, all of the systems on which the problem shows up seem to be 64-bit. > > > > If you can't reproduce it on a 32-bit system, some type casting may be wrong > > somewhere. > > I realized last night what the problem must be. It's extremely obvious in > retrospect, but I happen to have a blind spot in this particular area. > > All you guys must have CONFIG_USB_SUSPEND turned off. Mattis certainly > does; I checked his .config. Now I hardly ever do any testing without > CONFIG_USB_SUSPEND, since there's not much point working on power > management code if your kernel isn't set up to actually suspend devices. > As a result I missed seeing the problems caused by the autosuspend > changes. Well, on my box the USB suspend also doesn't work with USB_SUSPEND set, but the reason is different: sb usb2: 'global' suspend -16 hub 2-0:1.0: suspend error -16 suspend_device(): usb_suspend+0x0/0x5b [usbcore]() returns -16 Could not suspend device usb2: error -16 The .config and full dmesg output (with the three debug patches applied) are attached. Greetings, Rafael -- You never change things by fighting the existing reality. R. Buckminster Fuller
Attachment:
dmesg-usb-suspend.log.gz
Description: GNU Zip compressed data
Attachment:
kernel-config.gz
Description: GNU Zip compressed data
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