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Bug 17062 - PnP Interrupts don't appear in /proc/interrupts
PnP Interrupts don't appear in /proc/interrupts
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity low
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Assigned To: Michael K. Johnson
Depends On:
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Reported: 2000-08-28 21:13 EDT by John William
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2000-08-29 17:41:54 EDT
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Description John William 2000-08-28 21:13:14 EDT
Kernel 2.2.16. I have added an ISA PnP modem. It is configured 
as /dev/ttyS1 using IRQ3. However IRQ3 does not appear in /proc/interrupts.

Otherwise the device works fine.
Comment 1 Alan Cox 2000-08-29 17:41:51 EDT
Does it appear in /proc/interrupts while you have it open (eg while online) -if
so then its not a bug but a feature. Linux knows how to reuse the IRQ for other
things when not using that port.
Comment 2 John William 2000-08-31 21:40:20 EDT
Alan - you're right, it does appear in /proc/interrupts while the device is 
actually in use but not at other times.

I was confused because it doesn't appear in /etc/isapnp.gone either so unless 
the device is actually in use it's "assignment" to IRQ3 does not appear 

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