printing on firefox results in irq storm on printer port

Oliver Iberien oliver-forward at
Fri Apr 7 20:33:04 UTC 2006

I was printing with native Firefox (FreeBSD 6.0) with CUPS, which 
Firefox sees and recognizes. The printer (Xerox N17, local, parallel port) 
started cycling through waiting-processing-waiting messages. Rebooting, I saw 
a message about an IRQ storm on the printer port being "throttled". Killing 
the job took care of this.

Has anyone else had an issue like this? Firefox printing isn't critical but 
it's always nice to know what's going on. 


Incidentally, killing the job required a crash course in lppasswd and the 
cupsd.conf file, which I'll describe briefly here for the record... lppasswd 
stores encrypted passwords for cups administrative functions. The format is 
lppasswd -g group -a user. Permissions to various parts of the cupsd 
administrative functions (interface at http://localhost:631/admin) are set in 
the various location sections of /usr/local/etc/cupsd.conf. The various 
parameters than can be set are at

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