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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

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

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


** Tags: apport-collected wily
-- 
 XPS 15 (9550) Won't boot with 4.4 
https://bugs.launchpad.net/bugs/1524122
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