Reducing noise in dmesg output

[Mark Linimon]

No one has mentioned the other reason to leave in verbosity: so that users
who are having problems can file more useful PRs.  This is particularly
true of video cards (which, as one might recall, is where this thread
started.)

In some cases it can save a whole round-trip of "please reboot with
another flag set and provide the following information ..."

mcl