On Mon, Mar 18, 2013 at 07:52:10PM +0100, Martin Mokrejs wrote: > Sarah Sharp wrote: > > On Mon, Mar 18, 2013 at 06:20:12PM +0100, Martin Mokrejs wrote: > >> Hi Sarah, > >> in this particular thread, the USB3 socket of the laptop works once > >> I plugin a device. When I unplug it and insert same or another device it appears > >> to be dead until I use 'lsusb -vvv'. After that, I see in dmesg the two lines: > > > > Which kernel are you running on? We had a regression that involved dead > > As the subject says, 3.8.2. I really started last week several different email > threads, each independent. > > > ports after a USB disconnect in 3.8. This was was fixed in 3.8.3. Can > > you please retest with that kernel version? > > Hmm, will do. What change do you mean exactly? Commit d79303047f25957a3e00d25cc1eddb82b3ee0f89 "USB: Fix connected device switch to Inactive state." along with three others. > BTW, how about this bugfix which just appeared at linux-pci? > [PATCH] PCI: Remove not needed check in disable aspm link I understand that you want to try and figure out on your own what bug you're hitting. I'm really happy you're enthusiastic about reporting and testing bug fixes. However, looking at random bug fix patches when we don't know the root cause is not very productive. I would suggest you read http://www.chiark.greenend.org.uk/~sgtatham/bugs.html, especially the "I think the tachyon modulation must be wrongly polarised" section. We have no hard proof that this is even a PCI bug. lsusb does cause the PCI host to wakeup out of D3, which triggers the PME disable messages you mentioned. However, lsusb also triggers the USB core to look at the roothub status registers. Without further debugging, we can't be sure if we lost a PCI wakeup from the port status change, or if the xHCI driver mishandled the USB device disconnect and running lsusb causes the USB core to notice the connect change. Let's rule out the most common case, the xHCI driver, first. Please, try 3.8.3 first, and if that doesn't help, turn on CONFIG_USB_DEBUG and CONFIG_USB_XHCI_HCD_DEBUGGING, and send me the dmesg from the time you first unplug the USB 3.0 device to when you replug it in and have to run `sudo lsusb -v` to get the device to appear. Sarah Sharp -- 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
