Re: lp IRQ vanishing

Joachim 'Jojo' Schmitz (
Thu, 12 Dec 1996 17:21:37 +0100 (MET)

Hi Dale

> 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.)
Is 'lp' built in the kernel or are you using the module and kerneld?
If using the module and kerneld, the behavoir you decribed is quit normal
and could be avioded with an appropriate "options lp" line in /etc/conf.modules.

Bye,	Jojo

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