On Fri, Mar 27, 2015 at 2:10 PM, Tom Horsley horsley1953@gmail.com wrote:
but when I updated the kernel in the fedora 21 boot partition by chrooting into it from the live USB session, the newly installed kernel was able to boot just fine, so the new update apparently included whatever was missing previously.
Ahh. That sorta sounds like possibly a dracut bug affected the original initramfs you had. So then dracut gets updated, and kernel update causes a new initramfs to be generated with updated dracut, and so the problem seems magically fixed.