Red Hat Bugzilla – Bug 100584
Erroneos IRQ conflicts when loading sb module
Last modified: 2015-01-04 17:02:44 EST
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Description of problem:
Legacy SB card does not work in Severn because of a reported
probable IRQ conflict (i.e. sound is chopped).
However, /proc/interrupts shows there is no IRQ conflict, and
changing the soundcard IRQ does not change the behaviour.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot kernel (w/ or w/o ACPI)
Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
sb: No ISAPnP cards found, trying standard ones...
SB 4.13 detected OK (220)
sb: Interrupt test on IRQ7 failed - Probable IRQ conflict
No IRQ conflict report and a working soundcard.
$ cat /proc/interrupts
0: 116001 XT-PIC timer
1: 1894 XT-PIC keyboard
2: 0 XT-PIC cascade
5: 0 XT-PIC usb-uhci, usb-uhci
7: 0 XT-PIC soundblaster
8: 1 XT-PIC rtc
11: 3811 XT-PIC eth0
12: 76765 XT-PIC PS/2 Mouse
14: 13934 XT-PIC ide0
15: 1635 XT-PIC ide1
Created attachment 94175 [details]
I've managed to get sb working with 'acpi=off' and reserving
IRQ 5 for legacy ISA in the BIOS.
However, when ACPI is enabled, it uses IRQ 5 as shown in the dmesg
attachment, which creates the conflict with sb.