IRQ conflict with parport and other devices (Re: Wireless issues...)

Matt Zimmerman mdz at
Mon Sep 20 02:18:18 UTC 2004

On Mon, Sep 20, 2004 at 09:53:35AM +0800, John wrote:

> If lp is loaded, it should be using IRQ 7 or (I think) 5, depending on 
> which I/O port it's using.
> As I've already stated, there are generally BIOS settings to workaround 
> software that can't cope with this, but I do not believe it's a BIOS 
> problem.
> It _can_ arise if you install a conflicting ISA device, but ISA PnP and 
> expecially PCI should never conflict with this. That's why one of my 
> suggestions was to change the PnP OS setting. _I_ always have it turned 
> on for Linux, but while it works for the hardware I use it might not 
> work for others.

Are you saying that it should be possible for PCI devices to share IRQ7 with
the parallel port?  If so, it could be argued that Linux is at fault here,
but my impression was that this is not the case.  The BIOS is assigning
IRQ7 to PCI devices when it is also in use by the parallel port.

 - mdz

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