On Thu, 6 Sep 2012, Florian Merz wrote: > I've attached the dmesg (USB_DEBUG enabled) output from boot to > enabling a usb port manually (380) until plugging in a device (404). I think the problem shows up in these lines: [ 3.520138] xhci_hcd 0000:00:14.0: power state changed by ACPI to D2 [ 5.542872] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D2 [ 5.642683] ehci_hcd 0000:00:1d.0: power state changed by ACPI to D2 It may be that your host controllers do not support PCI wakeup from D2. What does the "lspci -vv" output show for the host controllers (you have to run it as root)? On Fri, 7 Sep 2012, Florian Merz wrote: > This morning I noticed that first new USB device I plug in after my > system resumed from suspend gets recognized, nut only the first. > I reproduced this after a fresh boot. The dmesg output is attached. > The USB drive was pluged in three times: > 1. After booting (around 30) > 2. After resuming from suspend (around 80) which worked > 3. After removing the stick i waited a few seconds and inserted it again. I don't know why the first device plugged in after resume was recognized. For some reason the xHCI controller did wake up, even though it was in D2. However I can tell you that if you plugged in a second device into a USB-3 port before unplugging the USB drive, the second device would have been recognized. But once all the USB-3 ports were unplugged, the controller went back into D2 and then would not wake up. 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
