Yes, it sounds like that is the initial trigger. So somewhere between 3.16 and 4.4 the kernel got better in declaring which disk drives could be hot-plugged. And the AHCI and (likely) the fakeraid modes potentially support to hot-plug disks (you could have externally accessible drive bays). Sometimes the BIOS allows to change the hot-plug support but not all). If you had that BIOS option that would be a work-around for you.
But probably dmraid should not care about a drive being removable. It probably was meant to protect against probing USB sticks and/or cdroms. I don't know for sure. As said on some of the threads you link I would rather not think of this as a kernel bug. It rather supports the flag more correctly. So if something needs to change it probably is dmraid. Unfortunately that change might have odd consequences in other cases. So I would like to be careful there. ** Also affects: dmraid (Ubuntu) Importance: Undecided Status: New ** Changed in: dmraid (Ubuntu) Importance: Undecided => Medium ** Changed in: dmraid (Ubuntu) Status: New => Confirmed ** Changed in: linux (Ubuntu) Status: Confirmed => Invalid ** Changed in: dmraid (Ubuntu) Assignee: (unassigned) => Stefan Bader (smb) ** Also affects: dmraid (Ubuntu Xenial) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Xenial) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1611277 Title: Kernel Shipped With Ubuntu 16.04.1 Cannot Recognize fakeRaid To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dmraid/+bug/1611277/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs