interrupt conflict with sound and video?

interrupt conflict with sound and video?

[Peter John Cameron]

I've got a voodoo 3000 video card and an integrated Creative SoundBlaster
AudioPCI 64V. These work without problems in win98. However, no sound is
forthcoming in Linux RH 6.1 (& 6.0) (apart from an odd click here and
there).

I've just noticed that win98 reports the voodoo card as having an IRQ of 11.
The SoundBlaster also has an IRQ of 11. On the other hand, the legacy sound
device has IRQ 7.

In Linux, the voodoo has IRQ 11 and the soundcard (automatically detected as
an ensoniq 1371) is also given IRQ 11.

Is this why I get no sound? IRQ 7 is free on my Linux system, so how should
I go about changing the sound card's IRQ from 11 to 7? Would such a change
affect how sound works in win98? More to the point, would it solve my lack
of Linux sound?

Someone suggested moving the PCI cards around in the slots. The sound card
is integrated onto the motherboard, so this means I have to physically move
the voodoo card? Is this the only solution?

Cheers,
Peter

Re: interrupt conflict with sound and video?

[Deirdre Saoirse]

On Thu, 21 Oct 1999, Peter John Cameron wrote:

> Is this why I get no sound? IRQ 7 is free on my Linux system, so how should
> I go about changing the sound card's IRQ from 11 to 7? Would such a change
> affect how sound works in win98? More to the point, would it solve my lack
> of Linux sound?

That's probably why. You don't want it to use IRQ 7 unless you have
disabled the parallel port in the BIOS. That normally runs on IRQ 7.

As for the Win98 question, I have no personal knowledge as I've never been
a Windows user.

It seems to me the larger problem here is a system with so much stuff that
you've run out of IRQs. Might I recommend SCSI instead of two IDE chains?

-- 
_Deirdre   *   http://www.linuxcabal.net   *   http://www.deirdre.net
"Mars has been a tough target" -- Peter G. Neumann, Risks Digest Moderator
"That's because the Martians keep shooting things down." -- Harlan Rosenthal
<Harlan.Rosenthal@Dialogic.com>, retorting in Risks Digest 20.60

Re: interrupt conflict with sound and video?

[Tony Nugent]

On Thu Oct 21 1999 at 22:34, "Peter John Cameron" wrote:

> I've got a voodoo 3000 video card and an integrated Creative SoundBlaster

Hmm... sounds familiar :)

> AudioPCI 64V. These work without problems in win98. However, no sound is
> forthcoming in Linux RH 6.1 (& 6.0) (apart from an odd click here and
> there).
> 
> I've just noticed that win98 reports the voodoo card as having an IRQ of 11.
> The SoundBlaster also has an IRQ of 11. On the other hand, the legacy sound
> device has IRQ 7.
>
> In Linux, the voodoo has IRQ 11 and the soundcard (automatically detected as
> an ensoniq 1371) is also given IRQ 11.

I assume that you've done:
	cat /proc/interrupts
	cat /proc/pci
	cat /proc/dma
	cat /proc/ioports
and other such things.

PCI cards can happily share the same interrupt, no problem.  That's
one of the big advantages in going from isa -> pci and what you are
seeing is certainly not your problem.

> Is this why I get no sound? IRQ 7 is free on my Linux system, so how should

No idea.

> I go about changing the sound card's IRQ from 11 to 7? Would such a change

Don't bother.  No.

> affect how sound works in win98? More to the point, would it solve my lack
> of Linux sound?

No, not at all.  In fact, it may make things worse if you start trying to
manually assign interrupts.

Besides, if I recall correctly, irq7 is (sometimes) used by the
parport.

> Someone suggested moving the PCI cards around in the slots. The sound card
> is integrated onto the motherboard, so this means I have to physically move
> the voodoo card? Is this the only solution?

Could be worth trying.  Make sure that your bios is not doing anything
to the IRQs.

I have banshee/v3 systems with esoniq pci sound cards (1370 and 1371
chipsets... for various reasons I actually prefer the 1370).  It all
works nicely here.  (Redhat 5.2, 6.0 and now 6.1).

Cheers
Tony