Well that was really painful to find. After hours of bisecting and building kernel manually I've found it: Kernel (and Ubuntu Devs) enabled Intel IOMMU by default:
* https://github.com/torvalds/linux/commit/792fb43ce2c9 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1951440 Ubuntu Devs were even aware that this might break older systems: > A downside is that this change may introduce boot regressions on old systems (especially those with buggy firmware). However, you can workaround this issue by disabling Intel IOMMU manually by setting `intel_iommu=off` in /etc/default/grub -> GRUB_CMDLINE_LINUX_DEFAULT This made my 24.04 system boot the first time with the shipped 6.8 kernel. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2060709 Title: Kernel 6.8 and Gigabyte F2A88XM-D3H mainboard do not collaborate To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2060709/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
