PROBLEM: 4.4 won't boot on Dell XPS Laptop Inbox x

[Ames Cornish]

Hi,

I have been running 4.3 on my laptop OK, but 4.4 will not boot at all.
I've tried rc3, rc4, rc5, and some of the drm builds.  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've attached a screenshot to a bugzilla report:

https://bugzilla.kernel.org/show_bug.cgi?id=108981

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


Please let me know if you need more info to track this down.

Thanks for any help!
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