*** This bug is a duplicate of bug 2105402 ***
https://bugs.launchpad.net/bugs/2105402
** Attachment added: "Successful kernel boot log with v6.14.0-24 with kernel
debug mode enabled"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2115580/+attachment/5886798/+files/kernellog_6.14.0-24-generic-debug.txt
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https://bugs.launchpad.net/bugs/2115580
Title:
New kernel failed to boot after upgrade to Ubuntu 25.04(plucky) on
iMac14,4
Status in linux package in Ubuntu:
Fix Committed
Bug description:
After upgrading from Ubuntu 24.10 to 25.04 on my iMac14,4
(https://linux-hardware.org/?probe=304fb711c1), the new
kernel(6.14.0-22-generic) would not boot from grub.
When trying to boot into recovery mode with the new kernel it gets
stuck at `Loading initial ramdisk...`.
After discussing with ChatGPT I also tried the following kernel
parameters "intel_iommu=on iommu=pt i915.force_probe=bdw irqpoll
initcall_debug ignore_loglevel no_console_suspend debug log_buf=10M
efi=debug earlyprintk=vga,keep nomodeset", but they also failed.
I was able to boot fine with linux-image-6.11.0-28-generic.
Booting into the Ubuntu 25.04 LiveUSB also failed on this machine (but
works fine on my HP laptop which upgraded successfully).
After discussing with ChatGPT I tried booting the new kernel with
kexec, and this got me to gdm3 login, but didn't load input device
drivers.
Not sure how to progress this further as I haven't been able to get
any useful error logs from a failed boot of the kernel from grub. Not
sure if its a kernel configuration problem with the new kernel, or a
kernel bug. I guess a next step could be trying with an intermediate
version of the kernel and try and discover which version of the kernel
introduced this problem. But I don't have time for this right now.
There is one other iMac14,4 on the linux hardware database that has
successfully booted a 6.11+ kernel here: `https://linux-
hardware.org/?probe=0d1404551f`. It is using v6.12.9-desktop-1omv2490
from OpenMandriva 25.01.
ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: linux-image-6.14.0-22-generic 6.14.0-22.22
ProcVersionSignature: Ubuntu 6.11.0-28.28-generic 6.11.11
Uname: Linux 6.11.0-28-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.32.0-0ubuntu5.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: danny 4854 F.... wireplumber
/dev/snd/controlC0: danny 4854 F.... wireplumber
/dev/snd/seq: danny 4834 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Sun Jun 29 12:23:04 2025
InstallationDate: Installed on 2023-01-19 (892 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64
(20220809.1)
IwDevWlp2s0Link:
Connected to <hidden-mac> (on wlp2s0)
SSID: <hidden>
freq: 5180.0
signal: -56 dBm
tx bitrate: 702.0 MBit/s
MachineType: Apple Inc. iMac14,4
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.11.0-28-generic
root=UUID=6f794959-8161-44d2-8b19-da3f2a5f105a ro acpi_backlight=video
i915.enable_dpcd_backlight=1 acpi_osi=Linux intel_iommu=on iommu=pt
i915.force_probe=bdw irqpoll initcall_debug ignore_loglevel no_console_suspend
debug log_buf=10M efi=debug earlyprintk=vga,keep
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.11.0-28-generic N/A
linux-backports-modules-6.11.0-28-generic N/A
linux-firmware 20250317.git1d4c88ee-0ubuntu1.2
SourcePackage: linux
UpgradeStatus: Upgraded to plucky on 2025-06-27 (1 days ago)
dmi.bios.date: 10/27/2021
dmi.bios.release: 0.1
dmi.bios.vendor: Apple Inc.
dmi.bios.version: 432.60.3.0.0
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-81E3E92DD6088272
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac14,4
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-81E3E92DD6088272
dmi.modalias:
dmi:bvnAppleInc.:bvr432.60.3.0.0:bd10/27/2021:br0.1:svnAppleInc.:pniMac14,4:pvr1.0:rvnAppleInc.:rnMac-81E3E92DD6088272:rvriMac14,4:cvnAppleInc.:ct10:cvrMac-81E3E92DD6088272:skuSystemSKU#:
dmi.product.family: Mac
dmi.product.name: iMac14,4
dmi.product.sku: System SKU#
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
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