Comment 38 for bug 277924

Adam, I think the issue there is that klogd does not (as far as I know) have any reliable way of detecting that the running kernel was compiled with that option enabled; while it's true on ubuntu systems that /boot/config-$(uname -r) exists, it's not guaranteed to exist generically, and I don't see that information exported via /proc or /sys, though I'd be happy to be corrected. (IIRC, there used to be a patch floating around that would cause the kernel to create a /proc/config.gz, but it didn't get accepted upstream.)