From: Bill Davidsen <davidsen@tmr.com>
To: Krzysztof Halasa <khc@pm.waw.pl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ACPI and ISA IRQ 9, Linux 2.4
Date: Mon, 23 Feb 2004 11:09:20 -0500 [thread overview]
Message-ID: <403A25B0.5090104@tmr.com> (raw)
In-Reply-To: <m3isi3n9wa.fsf@defiant.pm.waw.pl>
Krzysztof Halasa wrote:
> Hi,
>
> I think this is a known problem, but I don't know how to fix it:
>
> I have a dual Pentium-2 machine (non-SCSI Asus P2B-D), latest BIOS with
> ACPI etc. It has an ISA card (serial port) using IRQ 9 (I can't change
> the IRQ). It works fine without ACPI, Linux 2.4 lists IRQ 9 as
> APIC edge-triggered.
>
> With acpi=force (due to BIOS date) IRQ 9 is used by ACPI. /proc/interrupts
> lists it as APIC level-triggered, and the ISA card no longer generates
> interrupts.
>
> IRQ 9 is set to "ISA" in BIOS setup. acpi_irq_isa=9 doesn't help.
>
> Is is possible to fix it? Or is it just impossible to use ISA IRQ 9
> with ACPI?
>
> More details available on request, of course.
I have a similar problem, and my aha1520 can't be moved off irq9 without
cutting traces on the system board. How bad is it without ACPI at all? I
tried that for a while, and several other things didn't work, and it
looks as if the aha1520 driver won't share irq anyway, and something
else (I forget) wants that irq as well.
I boot into 2.4 to do backups, fortunately the only thing on the SCSI.
--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
next prev parent reply other threads:[~2004-02-23 16:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-19 1:19 ACPI and ISA IRQ 9, Linux 2.4 Krzysztof Halasa
2004-02-23 16:09 ` Bill Davidsen [this message]
2004-02-23 16:42 ` Michael Frank
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