Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem | Date | Thu, 14 Sep 2006 22:21:05 +0200 |
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On Thursday, 14 September 2006 21:37, Rafael J. Wysocki wrote: > On Thursday, 14 September 2006 20:28, Alan Stern wrote: > > On Thu, 14 Sep 2006, Rafael J. Wysocki wrote: > > > > > > Let's try a simpler test. Leave USB_SUSPEND unset. > > > > > > > > First rmmod ohci-hcd. None of your full-speed USB devices will work, but > > > > that's okay. Try the suspend-twice test and see what happens. > > > > > > > > Second, rmmod ehci-hcd and modprobe ohci-hcd. Again try the suspend-twice > > > > test. > > > > > > Done, works (with USB_SUSPEND unset). > > > > Okay, good. > > Well, sorry. This test has been passed, but after a reboot it refused to > suspend just once giving the same messages that I've got from the kernel > with USB_SUSPEND set (the relevant dmesg output is attached).
This only happens if _both_ ohci_hcd and ehci_hcd are loaded before the suspend.
> > Then for the next stage, repeat the same tests but with > > USB_SUSPEND set. > > Compiling.
The results are now the same with and without USB_SUSPEND set. Namely, if one hcd is loaded before a suspend (either ehci or ohci), it succeeds (repeatable arbitrary number of times in a row). However, if both hcds are loaded before a suspend, it fails (100% of the time) and the messages are like in the dmesg output attached to the previous message.
I've reproduced this behavior on another x86_64 box.
Greetings, Rafael
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