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[HillClimber <1524122@xxxxxxxxxxxxxxxxxx>]

This is a screen shot of the failed boot.  I apologize for the poor
quality -- each line of text is only 1.75mm high on my high-DPI display.

** Attachment added: "boot log pic"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1524122/+attachment/4531989/+files/boot%20log%20hang.jpg

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Title:
   XPS 15 (9550) Won't boot with 4.4

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Neither 4.4rc3 nor 4.3rc4 will boot on my Dell XPS 15 (9550).  4.3
  boots fine.

  The boot process halts with "ALERT! /dev/disk/by-uuid/<uuid> does not
  exist", although the UUID does exist, and other kernels boot fine.

  I'm attaching a screenshot of the console boot log.  I apologize that
  it is hard to read, because my screen is 3840x2160 and each line is
  less that 2mm high.

  Here's my grub stanza:

                  load_video
                  gfxmode $linux_gfx_mode
                  insmod gzio
                  if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                  insmod part_gpt
                  insmod ext2
                  if [ x$feature_platform_search_hint = xy ]; then
                    search --no-floppy --fs-uuid --set=root  7e2ed448-28a7-465e-a5b0-58db19b2711a
                  else
                    search --no-floppy --fs-uuid --set=root 7e2ed448-28a7-465e-a5b0-58db19b2711a
                  fi
                  echo    'Loading Linux 4.4.0-040400rc4-generic ...'
                  linux   /boot/vmlinuz-4.4.0-040400rc4-generic root=UUID=7e2ed448-28a7-465e-a5b0-58db19b2711a ro  quiet splash i915.preliminary_hw_support=1 i915.enable_ips=0 $vt_handoff
                  echo    'Loading initial ramdisk ...'
                  initrd  /boot/initrd.img-4.4.0-040400rc4-generic

  Possibly related is the following warning when i update-initramfs:

  $ sudo update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-4.4.0-040400rc4-generic
  W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for module i915

  I have also reported this bug upstream:
  https://bugzilla.kernel.org/show_bug.cgi?id=108981

  Please let me know what other info would be helpful.  Thanks!
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  InstallationDate: Installed on 2015-11-18 (20 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Package: linux (not installed)
  Tags:  wily
  Uname: Linux 4.3.0-040300-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo users video wireshark
  _MarkForUpload: True

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