I created a test kernel, version 6.16.0-14.14~lp2105402, which is the same as 6.16.0-14 with the addition of commit "UBUNTU: SAUCE: hack: efi/libstub: enable t14s boot failure hack only". You can find it in the PPA at https://launchpad.net/~kevinbecker/+archive/ubuntu/lp2105402
You can install this kernel with the following commands: sudo add-apt-repository ppa:kevinbecker/lp2105402 sudo apt update sudo apt upgrade Then reboot, and you should be running the test kernel. Once installed and running, you can confirm the kernel via `uname -a`. Here's an example output with the test kernel: ~$ uname -a Linux questing-lp2105402 6.15.0-4-generic #4-Ubuntu SMP PREEMPT_DYNAMIC Fri Jul 4 14:41:53 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux Please see if this kernel fixes your issue and then I'll submit the patch for questing to the kernel mailing list. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2105402 Title: Plucky/Questing fails to boot on (older) Macs Status in linux package in Ubuntu: In Progress Status in linux source package in Plucky: Fix Released Status in linux source package in Questing: In Progress Bug description: [Impact] MacBookAir7,1 (i5-5250U) MacBookPro12,1 (i5-5287U) iMac14,1 (i5-4570R) With three older Macs I am trying Plucky versions from the past two weeks or so fail to boot. The built-in displays stay blank but the backlight is visible until I force the computers to power off. External video doesn't show anything. I have tried both installed (more below) and live images. With the live image the GRUB menu with "Try or install" does show up. All three do boot normally to 24.10 live images. The iMac has 24.10 installed which also boots fine. The two MacBooks have Plucky installed, one upgraded from an earlier version and one installed several weeks ago. Plucky booted fine until around 2025-03-16 when this boot issue started, both with the installed version and the live image. I know this because it caused me to set these aside until now when I had a chance to look closer and find a non-Mac computer that I installed on that date. [Test Case] Boot on above mentioned Macs. [Fix] Enable efi hack only on arm64. [Where Problems Could Occur] Non-arm64 machines that need this fix (highly unlikely) might not boot. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2105402/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
