On Wed, 18 Apr 2012, Andrey Rahmatullin wrote: > > Wow. Okay, I have boiled this down to a single patch. You should > > try this both with and without unbinding ehci-hcd, and post the dmesg > > log output that it generates in the two cases. > > Unbound: > > pci 0000:00:1d.0: wake-up capability enabled by ACPI > pci 0000:00:1d.0: Refused to change power state, currently in D0 > pci 0000:00:1d.0: cur 5 target 3 error 0 > pci 0000:00:1a.0: wake-up capability enabled by ACPI > pci 0000:00:1a.0: Refused to change power state, currently in D0 > pci 0000:00:1a.0: cur 5 target 3 error 0 > > Bound: > > ehci_hcd 0000:00:1d.0: wake-up capability enabled by ACPI > ehci_hcd 0000:00:1d.0: Refused to change power state, currently in D0 > ehci_hcd 0000:00:1d.0: cur 5 target 3 error 0 > ehci_hcd 0000:00:1a.0: wake-up capability enabled by ACPI > ehci_hcd 0000:00:1a.0: Refused to change power state, currently in D0 > ehci_hcd 0000:00:1a.0: cur 5 target 3 error 0 Very good. The two behaviors are the same. Now if you modify the patch by removing the change to hcd-pci.c, which will leave the EHCI code exactly the same as in the vanilla kernel, and set the pm_test value to "platform", what does the dmesg log show in the two cases? Steven reported that the power state does get set to D3hot; he did not get the "Refused to change power state" lines. I have a strong feeling that your computer crashes during suspend whenever the EHCI controllers are in a low-power state. We'll see. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
