An enhanced version of the fix I outlined above has now been accepted for inclusion in Linux kernel 4.2:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/core/hub.c?id=fb6d1f7df5d25299fd7b3e84b72b8851d3634764 ** Attachment removed: "AlsaInfo.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398308/+files/AlsaInfo.txt ** Attachment removed: "CRDA.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398309/+files/CRDA.txt ** Attachment removed: "CurrentDmesg.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398310/+files/CurrentDmesg.txt ** Attachment removed: "IwConfig.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398311/+files/IwConfig.txt ** Attachment removed: "Lspci.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398313/+files/Lspci.txt ** Attachment removed: "JournalErrors.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398312/+files/JournalErrors.txt ** Attachment removed: "Lsusb.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398314/+files/Lsusb.txt ** Attachment removed: "ProcCpuinfo.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398315/+files/ProcCpuinfo.txt ** Attachment removed: "ProcEnviron.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398316/+files/ProcEnviron.txt ** Attachment removed: "ProcInterrupts.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398317/+files/ProcInterrupts.txt ** Attachment removed: "ProcModules.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398318/+files/ProcModules.txt ** Attachment removed: "RfKill.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398320/+files/RfKill.txt ** Attachment removed: "UdevLog.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398322/+files/UdevLog.txt ** Attachment removed: "UdevDb.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398321/+files/UdevDb.txt ** Attachment removed: "WifiSyslog.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398323/+files/WifiSyslog.txt ** Attachment removed: "PulseList.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+attachment/4398319/+files/PulseList.txt ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1455376 Title: REGRESSION after upgrade from 14.10 to 15.04: USB3 boot device lost during system boot: "xhci_hcd 0000:04:00.0: Error while assigning device slot ID" / "device not accepting address 2, error -22" Status in linux package in Ubuntu: Confirmed Bug description: Booting Ubuntu 15.04 amd64 kernel "Linux version 3.19.0-16-generic (buildd@komainu) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13) ) #16-Ubuntu SMP Thu Apr 30 16:09:58 UTC 2015" on a Samsung RF711-S08 laptop (Sandy Bridge) from a USB3 stick connected to the USB3 port on the righthand side, the boot stalls at the Ubuntu splash screen (with the dots), with the USB3 stick LED showing no activity, eventually dropping to the initramfs console. If I unplug and replug the USB3 stick during the stall period, the LED shows activity and the boot proceeds. The same USB3 stick boots on another laptop without any problems. Excerpts from dmesg: Recognition of the USB3 port: [ 1.643737] xhci_hcd 0000:04:00.0: xHCI Host Controller [ 1.643741] xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 2 [ 1.646775] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003 [ 1.646777] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 1.646778] usb usb2: Product: xHCI Host Controller [ 1.646780] usb usb2: Manufacturer: Linux 3.19.0-16-generic xhci-hcd [ 1.646781] usb usb2: SerialNumber: 0000:04:00.0 [ 1.646886] hub 2-0:1.0: USB hub found [ 1.646895] hub 2-0:1.0: 2 ports detected Failure to initialize the USB3 device: [ 1.847589] xhci_hcd 0000:04:00.0: Error while assigning device slot ID [ 1.847597] xhci_hcd 0000:04:00.0: Max number of devices this xHCI host supports is 32. [ 1.847600] usb usb2-port1: couldn't allocate usb_device Replugged the USB3 device during the boot stall: [ 13.861689] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd [ 13.881832] usb 2-1: New USB device found, idVendor=0951, idProduct=162b [ 13.881844] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 13.881850] usb 2-1: Product: DT HyperX 3.0 [ 13.881855] usb 2-1: Manufacturer: Kingston [ 13.881860] usb 2-1: SerialNumber: ********************* [ 13.885561] usb-storage 2-1:1.0: USB Mass Storage device detected [ 13.885829] scsi host6: usb-storage 2-1:1.0 [ 13.885901] usbcore: registered new interface driver usb-storage [ 13.887130] usbcore: registered new interface driver uas I assume the bug is at 1.847589. --- ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: robert 1480 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 15.04 InstallationDate: Installed on 2012-12-07 (889 days ago) InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427) MachineType: SAMSUNG ELECTRONICS CO., LTD. RF511/RF411/RF711 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic root=UUID=51713370-20d5-4b75-ae59-7f6bda369278 ro quiet splash ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3 RelatedPackageVersions: linux-restricted-modules-3.19.0-16-generic N/A linux-backports-modules-3.19.0-16-generic N/A linux-firmware 1.143 Tags: vivid Uname: Linux 3.19.0-16-generic x86_64 UpgradeStatus: Upgraded to vivid on 2015-04-23 (22 days ago) UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare _MarkForUpload: True dmi.bios.date: 11/27/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 17HX.M045.20121127.SSH dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: RF511/RF411/RF711 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: 17HX dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr17HX.M045.20121127.SSH:bd11/27/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pnRF511/RF411/RF711:pvr17HX:rvnSAMSUNGELECTRONICSCO.,LTD.:rnRF511/RF411/RF711:rvr17HX:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: RF511/RF411/RF711 dmi.product.version: 17HX dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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