Created attachment 196511 [details] Boot Log Nether 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!
Created attachment 197051 [details] Boot log Here's a more recent boot log, after installing Skylake firmware, and easier to read
Same error with rc5
I had similiar problems with Dell 9350 (XPS 13) on archlinux. Adding the nvme (NVM Express, the SSD interface) module to the initramfs (presumably /etc/initramfs-tools/modules on ubuntu) fixed it for me.
WooHoo! That worked. For the record, I: - Added "nvme" to the end of /etc/initramfs-tools/modules - Ran update-initramfs -u - Rebooted and am now happily running 4.4rc5.
Closing. Please file any drm/i915 bugs at https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel