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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)

My system:

darek@LAPTOP-PORTABLE:~$ lsb_release -rd
Description:    Ubuntu 15.10
Release:        15.10

darek@LAPTOP-PORTABLE:~$ uname -a
Linux LAPTOP-PORTABLE 4.2.0-23-generic #28-Ubuntu SMP Sun Dec 27 17:47:31 UTC 
2015 x86_64 x86_64 x86_64 GNU/Linux

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
Ubuntu 15.10 fails to boot from Sandisk USB stick
https://bugs.launchpad.net/bugs/1534948
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