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/2117174 Title: Questing fails to boot on (older) Macs Status in linux package in Ubuntu: In Progress Bug description: With older Macs Questing fails 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. This is almost certainly the same issue as for Plucky: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2105402/comments/16 The fix for Plucky just rolled out as an SRU but Questing inherited the bad patch. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2117174/+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
