Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug plucky -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2115580 Title: New kernel failed to boot after upgrade to Ubuntu 25.04(plucky) on iMac14,4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2115580/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
