OK, so I bisected the kernel versions by using the mainline builds. The first kernel where this breaks is v4.8-rc1 (v4.7.x works fine).
I think did a git bisection and found that this commit is the bad one: 27b79027bc112a63ad4004eb83c6acacae08a0de This seems a bit strange to me, though, as this is a merge commit and both of the two parent commits work. Investigating further. -- 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/1842965 Title: Unable to boot kernel 4.15 on MacPro5,1 (mid 2012) Status in linux package in Ubuntu: Confirmed Bug description: System: Mac Pro 5,1 (mid-2012). I'm unable to boot the Ubuntu 18.04 installer ISO on this system (tried both 18.04.0 and 18.04.3). I was able to boot the 16.04.1 ISO (but NOT 16.04.6) and installed 16.04 successfully. Then, I upgraded to 18.04. However, when trying to boot the new kernel (4.15.0-60), it just locks up at the purple screen. Booting back to 4.4.0-161 works. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: stalbert 2072 F.... pulseaudio /dev/snd/controlC1: stalbert 2072 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=9c6c2f5f-9303-4f65-955d-30f5db341801 InstallationDate: Installed on 2019-09-05 (0 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: enp10s0 no wireless extensions. lo no wireless extensions. enp9s0 no wireless extensions. MachineType: Apple Inc. MacPro5,1 Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-161-generic root=UUID=c7c8d4ce-3f44-41cd-8ce0-2e835c8d5547 ro quiet splash ProcVersionSignature: Ubuntu 4.4.0-161.189-generic 4.4.186 RelatedPackageVersions: linux-restricted-modules-4.4.0-161-generic N/A linux-backports-modules-4.4.0-161-generic N/A linux-firmware 1.173.9 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no Tags: bionic Uname: Linux 4.4.0-161-generic x86_64 UpgradeStatus: Upgraded to bionic on 2019-09-05 (0 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 08/08/17 dmi.bios.vendor: Apple Inc. dmi.bios.version: MP51.88Z.0084.B00.1708080528 dmi.board.asset.tag: 0 dmi.board.name: Mac-F221BEC8 dmi.board.vendor: Apple Inc. dmi.chassis.type: 7 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-F221BEC8 dmi.modalias: dmi:bvnAppleInc.:bvrMP51.88Z.0084.B00.1708080528:bd08/08/17:svnAppleInc.:pnMacPro5,1:pvr0.0:rvnAppleInc.:rnMac-F221BEC8:rvr:cvnAppleInc.:ct7:cvrMac-F221BEC8: dmi.product.name: MacPro5,1 dmi.product.version: 0.0 dmi.sys.vendor: Apple Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1842965/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
