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

[Matt Zimmerman]

On Sun, Sep 19, 2004 at 12:01:46PM +0100, Matthew Garrett wrote:

> On Sun, 2004-09-19 at 09:57 +1000, Chris Edwards wrote:
> 
> > I had the same problem with my ipw2100. The solution was to disable the
> > parallel port in the BIOS. It was trying to use the same IRQ. I suspect
> > it's an ACPI of APIC issue, and one of the kernel commandline options
> > might fix it. You're not using a Dell by any chance are you?
> 
> It seems to be a problem with newer kernels. The parallel port drivers
> seem to grab IRQ 7 and refuse to let anything else use it. If the
> parallel port driver is loaded after everything else, it will realise
> that it can't have the interrupt and use polling instead.

Yes, creating a problematic situation:

https://bugzilla.ubuntu.com/show_bug.cgi?id=1254

If that is the correct solution, perhaps lp should be loaded by
init.d/cupsys or similar, rather than init.d/module-init-tools?

Currently, lp is loaded by S20module-init-tools, and then S40hotplug comes
along and activates other devices which are assigned the same IRQ.

-- 
 - mdz (who thought we left these issues behind with ISA expansion cards)