Help me solve X11 "shmget(lowmem) errror: Invalid agrument"

[David King]

ThinkPad Z60t, FC 4 and X11 6.8.2.  All of a sudden, after working fine
for months, X fails to start at boot and I get an error in Xorg.0.log
that says "shmget(lowmem) error: Invalid argument".  I haven't messed
with the system config lately so I can't imagine what's causing this.  I
think I've eliminated hardware problems as a cause, Knoppix and a new
install of FC6 on another drive both start X just fine.

A Google search on this error finds a couple of occurrences, one of
which was solved by freeing up buffer space that had been dedicated to
TCP buffers.  I haven't been doing anything like that on my machine but
that solution suggests this problem might have something to do with low
memory utilization.

I've got no idea how to go about troubleshooting this error.  Any help
would be appreciated.  Otherwise I'll have to rebuild from scratch and I
really hate to do that.

Thanks,
Dave
-- 
David King
dave at daveking.com