From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from canardo.mork.no ([148.122.252.1]:49181 "EHLO canardo.mork.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751102Ab2GYKAA (ORCPT ); Wed, 25 Jul 2012 06:00:00 -0400 From: =?utf-8?Q?Bj=C3=B8rn_Mork?= To: Huang Ying Cc: "Rafael J. Wysocki" , Zheng Yan , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-usb@vger.kernel.org, Alan Stern Subject: Re: bisected regression, v3.5 -> next-20120724: PCI PM causes USB hotplug failure References: <87r4s0opck.fsf@nemi.mork.no> <87pq7ko532.fsf@nemi.mork.no> <1343190864.10311.26.camel@yhuang-dev> Date: Wed, 25 Jul 2012 11:58:37 +0200 In-Reply-To: <1343190864.10311.26.camel@yhuang-dev> (Huang Ying's message of "Wed, 25 Jul 2012 12:34:24 +0800") Message-ID: <87k3xskvqq.fsf@nemi.mork.no> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" Sender: linux-pci-owner@vger.kernel.org List-ID: --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Huang Ying writes: > On Wed, 2012-07-25 at 06:08 +0200, Bj=C3=B8rn Mork wrote: >> Enabling autosuspend for USB causes hotplug failure in the current >> linux-next. Newly plugged devices are not detected at all until the >> port/controller is manually powered on by writing "on" to power/control. >> Testing is pretty simple: >>=20 >> 1) for f in /sys/bus/usb/devices/*/power/control; do echo auto > $f; d= one > > Have you done: > > for f in /sys/bus/pci/devices/*/power/confol; do echo auto > $f; done > > ? > > If not, the pci device will not be suspended at all. Yes, sorry for missing that. I had it automatically enabled. Yes, autosuspend for the PCI device and all child devices must be enabled for the device to be suspended at all, of course. >> 2) wait for the controllers to suspend >> 3) plugin a new USB device > > After plugin the new USB device, is there anything in dmesg? No. Absolutely nothing, so the USB devices is not enumerated. Another indication of the same: Plugging a device like an Android phone, which normally detects being connected to a host and presents a device type menu to the user, results in the charging LED lighting up but no menu. Trying to show the sequence of events: 1) the controllers are suspended: Jul 25 11:27:12 nemi kernel: [ 38.962792] uhci_hcd 0000:00:1a.2: power st= ate changed by ACPI to D2 Jul 25 11:27:12 nemi kernel: [ 39.006718] uhci_hcd 0000:00:1d.0: power st= ate changed by ACPI to D2 Jul 25 11:27:15 nemi kernel: [ 41.808471] uhci_hcd 0000:00:1a.0: power st= ate changed by ACPI to D2 Jul 25 11:27:15 nemi kernel: [ 41.824123] ehci_hcd 0000:00:1a.7: power st= ate changed by ACPI to D2 Jul 25 11:27:15 nemi kernel: [ 41.824194] ehci_hcd 0000:00:1d.7: power st= ate changed by ACPI to D2 2) I connect a new USB device here 3) I read all power/files triggering this warning (as expected), included for timing info - this happens a while after connecting the USB device: Jul 25 11:28:34 nemi kernel: [ 121.440558] WARNING! power/level is depreca= ted; use power/control instead 4) I wake up the usb2 bus I connected the device to, and it is immediately found (no info about power state change here?): nemi:/home/bjorn# echo on > /sys/bus/usb/devices/usb2/power/control=20 Jul 25 11:29:32 nemi kernel: [ 179.121418] ehci_hcd 0000:00:1d.7: setting = latency timer to 64 Jul 25 11:29:32 nemi kernel: [ 179.364088] usb 2-1: new high-speed USB dev= ice number 3 using ehci_hcd Jul 25 11:29:33 nemi kernel: [ 179.500042] usb 2-1: New USB device found, = idVendor=3D0fce, idProduct=3D2138 Jul 25 11:29:33 nemi kernel: [ 179.500055] usb 2-1: New USB device strings= : Mfr=3D1, Product=3D2, SerialNumber=3D3 Jul 25 11:29:33 nemi kernel: [ 179.500063] usb 2-1: Product: SEMC HSUSB De= vice Jul 25 11:29:33 nemi kernel: [ 179.500069] usb 2-1: Manufacturer: SEMC Jul 25 11:29:33 nemi kernel: [ 179.500075] usb 2-1: SerialNumber: 43423531= 314D42573144 Doing the same with commit 448bd857d reverted: 1) the controllers are suspended (to state D3? instead of D2?): Jul 25 11:34:01 nemi kernel: [ 37.064955] uhci_hcd 0000:00:1a.2: power st= ate changed by ACPI to D3 Jul 25 11:34:01 nemi kernel: [ 37.106586] uhci_hcd 0000:00:1d.0: power st= ate changed by ACPI to D3 Jul 25 11:34:04 nemi kernel: [ 39.808329] uhci_hcd 0000:00:1a.0: power st= ate changed by ACPI to D3 Jul 25 11:34:04 nemi kernel: [ 39.840054] ehci_hcd 0000:00:1d.7: power st= ate changed by ACPI to D3 Jul 25 11:34:04 nemi kernel: [ 39.840068] ehci_hcd 0000:00:1a.7: power st= ate changed by ACPI to D3 2) plugging a USB device causes immediate wakeup (and logs changes state to D0): Jul 25 11:34:43 nemi kernel: [ 78.575357] ehci_hcd 0000:00:1d.7: power st= ate changed by ACPI to D0 Jul 25 11:34:43 nemi kernel: [ 78.588162] ehci_hcd 0000:00:1d.7: power st= ate changed by ACPI to D0 Jul 25 11:34:43 nemi kernel: [ 78.588292] ehci_hcd 0000:00:1d.7: setting = latency timer to 64 Jul 25 11:34:43 nemi kernel: [ 78.832337] usb 2-1: new high-speed USB dev= ice number 3 using ehci_hcd Jul 25 11:34:43 nemi kernel: [ 78.968286] usb 2-1: New USB device found, = idVendor=3D0fce, idProduct=3D2138 Jul 25 11:34:43 nemi kernel: [ 78.968300] usb 2-1: New USB device strings= : Mfr=3D1, Product=3D2, SerialNumber=3D3 Jul 25 11:34:43 nemi kernel: [ 78.968307] usb 2-1: Product: SEMC HSUSB De= vice Jul 25 11:34:43 nemi kernel: [ 78.968314] usb 2-1: Manufacturer: SEMC >>=20 >> I've bisected the regression down to this commit: >>=20 >>=20 >> commit 448bd857d48e69b33ef323739dc6d8ca20d4cda7 >> Author: Huang Ying >> Date: Sat Jun 23 10:23:51 2012 +0800 >>=20 >> PCI/PM: add PCIe runtime D3cold support >>=20=20=20=20=20 >>=20 >> Looks like this somehow powers down my USB host controllers in such a >> way that they are unable to detect connections to their ports. The >> system is a pretty standard 4 year old intel based laptop. Full lspci >> listing is attached. >> >> Please let me know if you need further information. And please fix this >> before rc1. It effectively makes USB non-functional if autosuspend is >> enabled. > > Can you provide the output of the following command lines? > > grep . /sys/bus/pci/devices/*/power/* > grep . /sys/bus/usb/devices/*/power/* > lsusb > > After the controllers suspended. I've attached two copies of this output:=20=20 - powerstate-withbug.txt, from a plain next-20120724 kernel - powerstate-reverted.txt, from a next-20120724 kernel with commit 448bd857d reverted I cannot really see any interesting differences in these. But the D3/D2 difference in the kernel log might be of interest? Bj=C3=B8rn --=-=-= Content-Type: text/plain Content-Disposition: inline; filename=powerstate-withbug.txt /sys/bus/usb/devices/1-0:1.0/power/async:enabled /sys/bus/usb/devices/1-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/1-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/1-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/1-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/1-6:1.0/power/async:enabled /sys/bus/usb/devices/1-6:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/1-6:1.0/power/runtime_enabled:disabled /sys/bus/usb/devices/1-6:1.0/power/runtime_status:unsupported /sys/bus/usb/devices/1-6:1.0/power/runtime_usage:0 /sys/bus/usb/devices/1-6:1.1/power/async:enabled /sys/bus/usb/devices/1-6:1.1/power/runtime_active_kids:0 /sys/bus/usb/devices/1-6:1.1/power/runtime_enabled:disabled /sys/bus/usb/devices/1-6:1.1/power/runtime_status:unsupported /sys/bus/usb/devices/1-6:1.1/power/runtime_usage:0 /sys/bus/usb/devices/1-6/power/active_duration:37124 /sys/bus/usb/devices/1-6/power/async:enabled /sys/bus/usb/devices/1-6/power/autosuspend:2 /sys/bus/usb/devices/1-6/power/autosuspend_delay_ms:2000 /sys/bus/usb/devices/1-6/power/connected_duration:119252 /sys/bus/usb/devices/1-6/power/control:auto /sys/bus/usb/devices/1-6/power/level:auto /sys/bus/usb/devices/1-6/power/persist:1 /sys/bus/usb/devices/1-6/power/runtime_active_kids:0 /sys/bus/usb/devices/1-6/power/runtime_active_time:36896 /sys/bus/usb/devices/1-6/power/runtime_enabled:enabled /sys/bus/usb/devices/1-6/power/runtime_status:suspended /sys/bus/usb/devices/1-6/power/runtime_suspended_time:82112 /sys/bus/usb/devices/1-6/power/runtime_usage:0 /sys/bus/usb/devices/2-0:1.0/power/async:enabled /sys/bus/usb/devices/2-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/2-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/2-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/2-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/2-4:1.0/power/async:enabled /sys/bus/usb/devices/2-4:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/2-4:1.0/power/runtime_status:suspended /sys/bus/usb/devices/2-4:1.0/power/runtime_usage:0 /sys/bus/usb/devices/2-4:1.19/power/async:enabled /sys/bus/usb/devices/2-4:1.19/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4:1.19/power/runtime_enabled:enabled /sys/bus/usb/devices/2-4:1.19/power/runtime_status:suspended /sys/bus/usb/devices/2-4:1.19/power/runtime_usage:0 /sys/bus/usb/devices/2-4:1.20/power/async:enabled /sys/bus/usb/devices/2-4:1.20/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4:1.20/power/runtime_enabled:disabled /sys/bus/usb/devices/2-4:1.20/power/runtime_status:unsupported /sys/bus/usb/devices/2-4:1.20/power/runtime_usage:0 /sys/bus/usb/devices/2-4:1.2/power/async:enabled /sys/bus/usb/devices/2-4:1.2/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4:1.2/power/runtime_enabled:enabled /sys/bus/usb/devices/2-4:1.2/power/runtime_status:suspended /sys/bus/usb/devices/2-4:1.2/power/runtime_usage:0 /sys/bus/usb/devices/2-4:1.3/power/async:enabled /sys/bus/usb/devices/2-4:1.3/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4:1.3/power/runtime_enabled:enabled /sys/bus/usb/devices/2-4:1.3/power/runtime_status:suspended /sys/bus/usb/devices/2-4:1.3/power/runtime_usage:0 /sys/bus/usb/devices/2-4:1.8/power/async:enabled /sys/bus/usb/devices/2-4:1.8/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4:1.8/power/runtime_enabled:enabled /sys/bus/usb/devices/2-4:1.8/power/runtime_status:suspended /sys/bus/usb/devices/2-4:1.8/power/runtime_usage:0 /sys/bus/usb/devices/2-4/power/active_duration:36976 /sys/bus/usb/devices/2-4/power/async:enabled /sys/bus/usb/devices/2-4/power/autosuspend:2 /sys/bus/usb/devices/2-4/power/autosuspend_delay_ms:2000 /sys/bus/usb/devices/2-4/power/connected_duration:119000 /sys/bus/usb/devices/2-4/power/control:auto /sys/bus/usb/devices/2-4/power/level:auto /sys/bus/usb/devices/2-4/power/persist:1 /sys/bus/usb/devices/2-4/power/runtime_active_kids:0 /sys/bus/usb/devices/2-4/power/runtime_active_time:36748 /sys/bus/usb/devices/2-4/power/runtime_enabled:enabled /sys/bus/usb/devices/2-4/power/runtime_status:suspended /sys/bus/usb/devices/2-4/power/runtime_suspended_time:82008 /sys/bus/usb/devices/2-4/power/runtime_usage:0 /sys/bus/usb/devices/2-4/power/wakeup:disabled /sys/bus/usb/devices/3-0:1.0/power/async:enabled /sys/bus/usb/devices/3-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/3-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/3-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/3-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/3-2:1.0/power/async:enabled /sys/bus/usb/devices/3-2:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/3-2:1.0/power/runtime_enabled:disabled /sys/bus/usb/devices/3-2:1.0/power/runtime_status:unsupported /sys/bus/usb/devices/3-2:1.0/power/runtime_usage:0 /sys/bus/usb/devices/3-2/power/active_duration:36736 /sys/bus/usb/devices/3-2/power/async:enabled /sys/bus/usb/devices/3-2/power/autosuspend:2 /sys/bus/usb/devices/3-2/power/autosuspend_delay_ms:2000 /sys/bus/usb/devices/3-2/power/connected_duration:118616 /sys/bus/usb/devices/3-2/power/control:auto /sys/bus/usb/devices/3-2/power/level:auto /sys/bus/usb/devices/3-2/power/persist:1 /sys/bus/usb/devices/3-2/power/runtime_active_kids:0 /sys/bus/usb/devices/3-2/power/runtime_active_time:36496 /sys/bus/usb/devices/3-2/power/runtime_enabled:enabled /sys/bus/usb/devices/3-2/power/runtime_status:suspended /sys/bus/usb/devices/3-2/power/runtime_suspended_time:81864 /sys/bus/usb/devices/3-2/power/runtime_usage:0 /sys/bus/usb/devices/3-2/power/wakeup:disabled /sys/bus/usb/devices/4-0:1.0/power/async:enabled /sys/bus/usb/devices/4-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/4-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/4-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/4-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/4-2:1.0/power/async:enabled /sys/bus/usb/devices/4-2:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/4-2:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/4-2:1.0/power/runtime_status:suspended /sys/bus/usb/devices/4-2:1.0/power/runtime_usage:0 /sys/bus/usb/devices/4-2:1.1/power/async:enabled /sys/bus/usb/devices/4-2:1.1/power/runtime_active_kids:0 /sys/bus/usb/devices/4-2:1.1/power/runtime_enabled:enabled /sys/bus/usb/devices/4-2:1.1/power/runtime_status:suspended /sys/bus/usb/devices/4-2:1.1/power/runtime_usage:0 /sys/bus/usb/devices/4-2:1.2/power/async:enabled /sys/bus/usb/devices/4-2:1.2/power/runtime_active_kids:0 /sys/bus/usb/devices/4-2:1.2/power/runtime_enabled:disabled /sys/bus/usb/devices/4-2:1.2/power/runtime_status:unsupported /sys/bus/usb/devices/4-2:1.2/power/runtime_usage:0 /sys/bus/usb/devices/4-2:1.3/power/async:enabled /sys/bus/usb/devices/4-2:1.3/power/runtime_active_kids:0 /sys/bus/usb/devices/4-2:1.3/power/runtime_enabled:disabled /sys/bus/usb/devices/4-2:1.3/power/runtime_status:unsupported /sys/bus/usb/devices/4-2:1.3/power/runtime_usage:0 /sys/bus/usb/devices/4-2/power/active_duration:26552 /sys/bus/usb/devices/4-2/power/async:enabled /sys/bus/usb/devices/4-2/power/autosuspend:2 /sys/bus/usb/devices/4-2/power/autosuspend_delay_ms:2000 /sys/bus/usb/devices/4-2/power/connected_duration:118200 /sys/bus/usb/devices/4-2/power/control:auto /sys/bus/usb/devices/4-2/power/level:auto /sys/bus/usb/devices/4-2/power/persist:1 /sys/bus/usb/devices/4-2/power/runtime_active_kids:0 /sys/bus/usb/devices/4-2/power/runtime_active_time:26376 /sys/bus/usb/devices/4-2/power/runtime_enabled:enabled /sys/bus/usb/devices/4-2/power/runtime_status:suspended /sys/bus/usb/devices/4-2/power/runtime_suspended_time:91568 /sys/bus/usb/devices/4-2/power/runtime_usage:0 /sys/bus/usb/devices/4-2/power/wakeup:disabled /sys/bus/usb/devices/5-0:1.0/power/async:enabled /sys/bus/usb/devices/5-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/5-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/5-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/5-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/6-0:1.0/power/async:enabled /sys/bus/usb/devices/6-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/6-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/6-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/6-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/7-0:1.0/power/async:enabled /sys/bus/usb/devices/7-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/7-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/7-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/7-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/8-0:1.0/power/async:enabled /sys/bus/usb/devices/8-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/8-0:1.0/power/runtime_enabled:enabled 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/sys/bus/pci/devices/0000:00:1f.3/power/runtime_usage:1 /sys/bus/pci/devices/0000:03:00.0/power/async:enabled /sys/bus/pci/devices/0000:03:00.0/power/control:auto /sys/bus/pci/devices/0000:03:00.0/power/runtime_active_kids:0 /sys/bus/pci/devices/0000:03:00.0/power/runtime_active_time:104580 /sys/bus/pci/devices/0000:03:00.0/power/runtime_enabled:enabled /sys/bus/pci/devices/0000:03:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:03:00.0/power/runtime_suspended_time:0 /sys/bus/pci/devices/0000:03:00.0/power/runtime_usage:1 /sys/bus/pci/devices/0000:03:00.0/power/wakeup:disabled Bus 001 Device 004: ID 17ef:4807 Lenovo UVC Camera Bus 002 Device 002: ID 1199:68a2 Sierra Wireless, Inc. Bus 003 Device 002: ID 08ff:2810 AuthenTec, Inc. AES2810 Bus 004 Device 002: ID 0a5c:2145 Broadcom Corp. Bluetooth with Enhanced Data Rate II Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub --=-=-= Content-Type: text/plain Content-Disposition: inline; filename=powerstate-reverted.txt /sys/bus/usb/devices/1-0:1.0/power/async:enabled /sys/bus/usb/devices/1-0:1.0/power/runtime_active_kids:0 /sys/bus/usb/devices/1-0:1.0/power/runtime_enabled:enabled /sys/bus/usb/devices/1-0:1.0/power/runtime_status:suspended /sys/bus/usb/devices/1-0:1.0/power/runtime_usage:0 /sys/bus/usb/devices/1-6:1.0/power/async:enabled 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/sys/bus/pci/devices/0000:03:00.0/power/runtime_usage:1 /sys/bus/pci/devices/0000:03:00.0/power/wakeup:disabled Bus 001 Device 004: ID 17ef:4807 Lenovo UVC Camera Bus 002 Device 002: ID 1199:68a2 Sierra Wireless, Inc. Bus 003 Device 002: ID 08ff:2810 AuthenTec, Inc. AES2810 Bus 004 Device 002: ID 0a5c:2145 Broadcom Corp. Bluetooth with Enhanced Data Rate II Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 17ef:4807 Lenovo UVC Camera Bus 002 Device 003: ID 0fce:2138 Sony Ericsson Mobile Communications AB Xperia X10 mini pro (Debug) Bus 002 Device 002: ID 1199:68a2 Sierra Wireless, Inc. Bus 003 Device 002: ID 08ff:2810 AuthenTec, Inc. AES2810 Bus 004 Device 002: ID 0a5c:2145 Broadcom Corp. Bluetooth with Enhanced Data Rate II Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub --=-=-=--