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[Kevin Brubeck Unhammer <1574178@xxxxxxxxxxxxxxxxxx>]

** Attachment added: "a bit more of the log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1574178/+attachment/4645004/+files/dropping.jpg

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https://bugs.launchpad.net/bugs/1574178

Title:
  4.4.0-21 "gave up waiting for root device"

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On a Lenovo A740, after upgrading to Xenial I have to downgrade to
  kernel 4.2.0-35 in order to be able to boot at all.

  
  My current /etc/default/grub:

  # If you change this file, run 'update-grub' afterwards to update
  # /boot/grub/grub.cfg.
  # For full documentation of the options in this file, see:
  #   info -f grub -n 'Simple configuration'

  #GRUB_DEFAULT=0
  #KBU: 4.4.0 doesn't find root :(((
  GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 4.2.0-35-generic"
  #GRUB_HIDDEN_TIMEOUT=0
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=5
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
  #GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  GRUB_CMDLINE_LINUX_DEFAULT=""
  GRUB_CMDLINE_LINUX="noprompt persistent"

  # Uncomment to enable BadRAM filtering, modify to suit your needs
  # This works with Linux (no patch required) and with any kernel that obtains
  # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
  #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

  # Uncomment to disable graphical terminal (grub-pc only)
  #GRUB_TERMINAL=console

  # The resolution used on graphical terminal
  # note that you can use only modes which your graphic card supports via VBE
  # you can see them in real GRUB with the command `vbeinfo'
  #GRUB_GFXMODE=640x480

  # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
  #GRUB_DISABLE_LINUX_UUID=true

  # Uncomment to disable generation of recovery mode menu entries
  #GRUB_DISABLE_RECOVERY="true"

  # Uncomment to get a beep at grub start
  #GRUB_INIT_TUNE="480 440 1"



  This is the same system as
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1463422

  See attached image for what the screen looks like when trying to boot
  4.4. My USB keyboard also stops working there so I can't actually type
  anything into the busybox.

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