Public bug reported:

[Summary]
Lenovo ThinkStation P7 failed to boot into OS/poweroff on 6.17.0-1025-oem 
without 'nomodeset'.

[Reproduce Steps]
1. Install the GM image.
2. Run the dist-upgrade to 6.17
3. sudo reboot

On 6.11, the machine can boot into OS after reboot. However, after
upgrading to 6.17, it becomes cannot shutdown, and even using pdu to
poweroff, it cannot boot into OS. However, if root is modified to
nomodeset in 6.17, the machine can work successfully, but not with
'quiet splash' or set ''.

[Affected Machines]
https://certification.canonical.com/hardware/202511-38056/

[Failed Rate]
1/1 (100%)

[Bug May Be Related]
https://bugs.launchpad.net/ubuntu/+source/linux-oem-6.17/+bug/2144522

[Other Info]
ubuntu@localhost:~$ uname -a
Linux localhost 6.17.0-1025-oem #25-Ubuntu SMP PREEMPT_DYNAMIC Fri May 29 
12:11:29 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux

ubuntu@localhost:~$ sudo cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`( . /etc/os-release; echo ${NAME:-Ubuntu} ) 2>/dev/null || 
echo Ubuntu`
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"
GRUB_CMDLINE_LINUX=""

# If your computer has multiple operating systems installed, then you
# probably want to run os-prober. However, if your computer is a host
# for guest OSes installed via LVM or raw disk devices, running
# os-prober can cause damage to those guest OSes as it mounts
# filesystems to look for things.
#GRUB_DISABLE_OS_PROBER=false

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-1025-oem 6.17.0-1025.25
ProcVersionSignature: Ubuntu 6.17.0-1025.25-oem 6.17.13
Uname: Linux 6.17.0-1025-oem x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckMismatches: ./casper/initrd 
./casper/minimal.standard.live.hotfix.size ./casper/minimal.standard.live.size 
./casper/minimal.manifest ./casper/minimal.standard.manifest 
./casper/minimal.standard.size ./casper/minimal.hotfix.size 
./casper/minimal.standard.live.hotfix.squashfs 
./casper/minimal.standard.hotfix.squashfs ./casper/minimal.standard.hotfix.size 
./casper/minimal.hotfix.squashfs ./casper/minimal.standard.live.manifest 
./casper/minimal.size ./boot/grub/grub.cfg
CasperMD5CheckResult: fail
Date: Wed Jul  1 05:40:44 2026
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for Ubuntu 24.04 for Lenovo
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-sutton-noble-oem-24.04b-20250711-541
InstallationDate: Installed on 2026-06-03 (28 days ago)
InstallationMedia: Ubuntu OEM 24.04.2 LTS "Noble Numbat" - Release amd64 
(20250710)
SourcePackage: linux-signed-oem-6.17
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed-oem-6.17 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2158877

Title:
  Lenovo ThinkStation P7 cannot boot into OS/shutdown with
  6.17.0-1025-oem without 'nomodeset'

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