Re: lp IRQ vanishing

Bas Mevissen (
Fri, 13 Dec 1996 09:20:28 +0100 (MET)

> I was wanting to test out operating my printer using interrupt-driven
> I/O rather than polling. So I executed "tunelp /dev/lp1 -i 7". That
> seems to work -- for a while. If I do "tunelp /dev/lp1" it will
> report that the parallel port is using IRQ 7 for a while, and then
> will revert to reporting that it is using polling. This reversion
> happens even if I'm not using the printer at the time. (I do have lpd
> running, but nothing queued.) Does anyone have any idea what might be
> going on? (I am using kernel 2.0.23 and Slackware 3.0.)
> Thanks,
> Dale
> --
> Dale R. Worley Ariadne Internet Services
> Voice: +1 617-899-7949 Fax: +1 617-899-7946 E-mail:
> "Internet-based electronic commerce solutions to real business problems."
You are probably using lp.o as a module and you load it automagically with
kerneld. So add the following line to /etc/conf.modules (and restart kerneld):

options lp irq=0,7,0

That's all folks :-)


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