Christopher, I tested 4.7-rc1 and it gets even worse. I have not seen
usb 2-1.2: device descriptor read/64, error -110 but it stops booting and unpluging and replugging usb stick does not make the process continue. ** 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/1534948 Title: Ubuntu 15.10 fails to boot from Sandisk USB stick Status in linux package in Ubuntu: Confirmed Bug description: Booting from Sandisk USB stick fails and stops on "device descriptor read/64, error -71" and "device not accepting address 6, error -71" on Dell Latitude E5420 Laptop. I tried every USB socket but without success. Booting with "rootwait" parameter does not help either. [ 5.190746] ata5: SATA link down (SStatus 0 SControl 300) [ 5.510923] ata6: SATA link down (SStatus 0 SControl 300) [ 18.414128] usb 2-1.4: device descriptor read/64, error -110 [ 23.601028] usb 2-1.4: device descriptor read/64, error -71 [ 23.777126] usb 2-1.4: new high-speed USB device number 4 using ehci-pci [ 23.861176] usb 2-1.4: device descriptor read/64, error -71 [ 24.049280] usb 2-1.4: device descriptor read/64, error -71 [ 24.225377] usb 2-1.4: new high-speed USB device number 5 using ehci-pci [ 24.641614] usb 2-1.4: device not accepting address 5, error -71 [ 24.713649] usb 2-1.4: new high-speed USB device number 6 using ehci-pci [ 25.129882] usb 2-1.4: device not accepting address 6, error -71 [ 25.131599] usb 2-1-port4: unable to enumerate USB device [ 25.205925] usb 2-1.6: new full-speed USB device number 7 using ehci-pci [ 25.303424] usb 2-1.6: New USB device found, idVendor=413c, idProduct=8187 [ 25.304928] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 25.306409] usb 2-1.6: Product: DW375 Bluetooth Module [ 25.307864] usb 2-1.6: Manufacturer: Dell Computer Corp [ 25.309305] usb 2-1.6: SerialNumber: 90004EDB8100 however unpluging and repluging usb stick makes booting process go further [ 35.799849] usb 2-1.4: new high-speed USB device number 8 using ehci-pci [ 35.893824] usb 2-1.4: New USB device found, idVendor=0781, idProduct=5583 [ 35.895294] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 35.896728] usb 2-1.4: Product: Ultra Fit [ 35.898129] usb 2-1.4: Manufacturer: SanDisk [ 35.899521] usb 2-1.4: SerialNumber: 4C530001160413113001 [ 35.905302] usb-storage 2-1.4:1.0: USB Mass Storage device detected [ 35.907051] scsi host6: usb-storage 2-1.4:1.0 [ 35.908544] usbcore: registered new interface driver usb-storage [ 35.911586] usbcore: registered new interface driver uas [ 36.909422] scsi 6:0:0:0: Direct-Access SanDisk Ultra Fit 1.00 PQ: 0 ANSI: 6 [ 36.911179] sd 6:0:0:0: Attached scsi generic sg2 type 0 [ 36.913169] sd 6:0:0:0: [sdb] 60751872 512-byte logical blocks: (31.1 GB/28.9 GiB) [ 36.915880] sd 6:0:0:0: [sdb] Write Protect is off [ 36.917297] sd 6:0:0:0: [sdb] Mode Sense: 43 00 00 00 [ 36.918317] sd 6:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 36.950274] sdb: sdb1 sdb2 < sdb5 > [ 36.955479] sd 6:0:0:0: [sdb] Attached SCSI removable disk [ 37.254029] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null) --- ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: darek 1257 F.... pulseaudio CurrentDesktop: LXDE DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=e7e49edd-f274-4ac4-ae57-ebbeb8082257 InstallationDate: Installed on 2015-11-10 (181 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Dell Inc. Latitude E5420 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=ee3725ef-3af5-4853-84aa-d4526d8e6014 ro priority=low rootwait ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8 RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 Tags: xenial Uname: Linux 4.4.0-22-generic x86_64 UpgradeStatus: Upgraded to xenial on 2016-04-23 (17 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 07/10/2011 dmi.bios.vendor: Dell Inc. dmi.bios.version: A02 dmi.board.name: 0H5TG2 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA02:bd07/10/2011:svnDellInc.:pnLatitudeE5420:pvr01:rvnDellInc.:rn0H5TG2:rvrA01:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5420 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1534948/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp