Comment # 30 on bug 917411 from Takashi Iwai

(In reply to macias - from comment #29)
> > > How to turn back dmesg to its default level? I.e. I know how to
> > > set it, I don't what level of messages was the default on
> > > installation.
> >
> > Just drop the dmesg command you added.
> 
> Wait, there is something wrong here. You asked me to 'Run "dmesg -n 8"
> once'. So I run dmesg once, and restarted computer. I didn't add it anywhere.

I meant to run the command once per boot.  The setup doesn't retain after
reboot.