Re: IRQ trouble

Jeroen-bart Engelen (yeep@xs4all.nl)
Tue, 11 Aug 1998 21:18:53 +0200 (CEST)


> > My new Adaptec AHA-2920 (using the future domain module) conflicts with my
> > Diamond Viper V330.
>
> Disable the IRQ on your video card. It is unnecessary. Most PC
> BIOS's have an "Assign IRQ2 to VGA" enable disable in CMOS setup.
> Set it to disable.

I can't disable anything on my videocard.
Don't we just all love PnP? :-)

And I never saw that option in my BIOS.
Besides, I thought IRQ9 was (unofficially) reserved for videoboards?

> > They both use IRQ9 and work in Win95.
> > When I tried getting the SCSI to work in Linux I experienced system
> > lockups when I started X.
>
> Perhaps it gets disabled on the video card by the video driver in
> Win95. Or perhaps Win95 allows them to share, but the video card
> doesn't use the IRQ so there are no problems.

Alan explained, it's a bug in Xfree.

> > The lockup occur when:
> > I load the module and then start X, when the videomode changes the system
> > hangs (hard reset is required).
> > Or when I start X, exit X and then insmod the driver (hard reset required
> > as well).
>
> You'll probably have to disable the VGA IRQ, or change the IRQ on
> your SCSI card.

That means moving the SCSI-board to another PCI-slot and assigning an IRQ
to that specific slot in my BIOS (if I have that option, that is).
GOD! I love PNP!!!!!!

> > I know IRQ's can be shared, although I'm not sure about IRQ9, since it's
> > the cascading IRQ, but Win95 seems to have no problem with it.
> > Weird thing is, DOS also hangs upon loading of the SCSI-driver.
>
> Win95 is probably fooling you. I doubt it shares an IRQ with
> anything.

It does work!

> > Is this normal behaviour, if so then why doesn't Linux warn me that the
> > IRQ is already used?
>
> Good point!

Alan said that Xfree didn't release the IRQ, but does that mean I can use
them seperatly, but not together?
In other words: "No SCSI in X"?

Also, is there someway to detect wether an IRQ wasn't released?

Yeep

Uncommon Linux errors:
EWOULDBENICE: Feature not implemented yet

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