Re: IRQ 255?

Steven Suson (kernel@dotd.dyn.ml.org)
Tue, 27 Jan 1998 17:00:32 -0700 (MST)

My system reports it as IRQ 255 also (or rather ff as of 2.1.82), my BIOS
(AMI) has an option 'Assign IRQ to PCI Vga card' which I have off, so I
would agree that it's pci's way of saying it doesn't have one.

On Tue, 27 Jan 1998, Bernhard Rosenkraenzer wrote:

> On Tue, 27 Jan 1998, Robert L Harris wrote:
>
> > Bus 0, device 2, function 0:
> > VGA compatible controller: Cirrus Logic GD 7548 (rev 0).
> > Fast devsel. IRQ 255.
> >
> > Note that the video device is on IRQ 255. Is this possibly a bug somewhere?
>
> IRQ 255 doesn't exist, but it looks like a (unsigned char) -1.
> My guess is that your VGA card doesn't use an IRQ, and IRQ 255 is the PCI
> driver's way to display this.
>
> LLaP
> bero