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Message #150580
[Bug 1524122] Re: XPS 15 (9550) Won't boot with 4.4
Here is a better more recent screenshot (reduced exposure), after
downloading skylake firmware...
** Attachment added: "boot log 12-08"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1524122/+attachment/4532003/+files/boot%20xps15%204.4rc4%202015-12-09.jpg
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https://bugs.launchpad.net/bugs/1524122
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!
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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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