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Subjectirq 16 : Nobody cared - alsa v. io-apic in 2.6.5-rc3-bk2
Date
I have a VIA k400 motherboard.

From dmesg:

...................
Advanced Linux Sound Architecture Driver Version 1.0.4rc2 (Tue Mar 30
08:19:30 2004 UTC).
ALSA device list:
#0: C-Media PCI CMI8738-MC6 (model 55) at 0xe800, irq 16
NET: Registered protocol family 2
.....................
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 372k freed
irq 16: nobody cared!
Call Trace:
[<c0108508>] __report_bad_irq+0x28/0x80
[<c01088ae>] do_IRQ+0x15e/0x1a0
[<c0106e08>] common_interrupt+0x18/0x20
[<c01044e3>] default_idle+0x23/0x30
[<c010455d>] cpu_idle+0x2d/0x40
[<c04ee61b>] start_kernel+0x2ab/0x320
[<c04ee1c0>] unknown_bootoption+0x0/0x180


handlers:
[<c0395800>] (snd_cmipci_interrupt+0x0/0x130)
Disabling IRQ #16
..............

I'm not sure which of the io-apic output is relevant but:

ENABLING IO-APIC IRQs
init IO_APIC IRQs
IO-APIC (apicid-pin) 2-0, 2-16, 2-17, 2-18, 2-19, 2-20, 2-21, 2-22,
2-23 not connected.
..TIMER: vector=0x31 pin1=2 pin2=-1
Using local APIC timer interrupts.
.................
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 *10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 *5 6 7 10 11 12 14 15)
SCSI subsystem initialized
......................
IOAPIC[0]: Set PCI routing entry (2-16 -> 0xa9 -> IRQ 16 Mode:1 Active:1)
00:00:01[A] -> 2-16 -> IRQ 16
..........................
testing the IO APIC.......................
IO APIC #2......
.... register #00: 02000000
....... : physical APIC id: 02
....... : Delivery Type: 0
....... : LTS : 0
.... register #01: 00178003
....... : max redirection entries: 0017
....... : PRQ implemented: 1
....... : IO APIC version: 0003
.... IRQ redirection table:
NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
00 000 00 1 0 0 0 0 0 0 00
01 001 01 0 0 0 0 0 1 1 39
02 001 01 0 0 0 0 0 1 1 31
03 001 01 0 0 0 0 0 1 1 41
04 001 01 0 0 0 0 0 1 1 49
05 001 01 0 0 0 0 0 1 1 51
06 001 01 0 0 0 0 0 1 1 59
07 001 01 0 0 0 0 0 1 1 61
08 001 01 0 0 0 0 0 1 1 69
09 001 01 0 1 0 1 0 1 1 71
0a 001 01 0 0 0 0 0 1 1 79
0b 001 01 0 0 0 0 0 1 1 81
0c 001 01 0 0 0 0 0 1 1 89
0d 001 01 0 0 0 0 0 1 1 91
0e 001 01 0 0 0 0 0 1 1 99
0f 001 01 0 0 0 0 0 1 1 A1
10 001 01 1 1 0 1 0 1 1 A9
11 001 01 1 1 0 1 0 1 1 B1
12 001 01 1 1 0 1 0 1 1 C1
13 001 01 1 1 0 1 0 1 1 C9
14 000 00 1 0 0 0 0 0 0 00
15 001 01 1 1 0 1 0 1 1 D1
16 001 01 1 1 0 1 0 1 1 B9
17 001 01 1 1 0 1 0 1 1 D9
IRQ to pin mappings:
IRQ0 -> 0:2
IRQ1 -> 0:1
IRQ3 -> 0:3
IRQ4 -> 0:4
.......................
IRQ15 -> 0:15
IRQ16 -> 0:16
IRQ17 -> 0:17
IRQ18 -> 0:18
IRQ19 -> 0:19
IRQ21 -> 0:21
IRQ22 -> 0:22
IRQ23 -> 0:23
.................................... done.
PCI: Using ACPI for IRQ routing
...................


sean

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