Beeping Mac since enabling HFSPLUS module

I followed the instructions on SDB:FilesystemBlacklisting - openSUSE Wiki to reenable access to MacOS filesystems from Leap on my iMac. Now while booted into Leap, the Mac makes a series of beeps, stops briefly, then repeats, whether in X session or using only vttys. Nothing unusual shows in dmesg. Is anyone familiar with this behavior or able to make it stop?

I don’t own Mac hardware, but the sequence of beeps being emitted is likely significant, and could help track down the underlying cause here.