dmesg not working on new system

Greg Barniskis nalists at
Mon Jun 5 17:02:07 PDT 2006

Chris Maness wrote:

>> Interesting.  Does "dmesg -a" show anything different?
> Yes, it does, but why would it not show anything without the flag right 
> after a reboot?  Wierd.  I almost suspect hard drive issues.

OK, THAT does not seem normal. Sorry, didn't catch that detail at first.

Right after booting you really should be able to review your boot 
messages with dmesg. While the dmesg on my servers typically goes 
empty after awhile, I've never had any problem reviewing kernel 
output from a fresh boot using the dmesg command.

Is /var/run/dmesg.boot populated correctly? What kinds of things are 
in the -a output? Same results booting with or without network 
attached? (asking because busy network w/ lots of system messages 
seems to be what's flushing the buffer for me).

Anybody else got suggestions? Kernel troubleshooting's not really my 
favorite thing, and as such my expertise in that area is close to 

Greg Barniskis, Computer Systems Integrator
South Central Library System (SCLS)
Library Interchange Network (LINK)
<gregb at>, (608) 266-6348

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