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From: Raphael Derosso Pereira - DephiNit <dephinit@softhome.net>
To: linux-kernel@vger.kernel.org
Subject: Changing PCI board's IRQ
Date: Sat, 16 Feb 2002 21:25:27 -0200
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Hello,

One computer that I administer have a IRQ conflict between a sound card and a 
ethernet card. Both share the IRQ 11.
I don't have physical access to the computer, so I tried to change the IRQ 
using the 'setpci' command.

# setpci -v -s 0:7.5 INTERRUPT_LINE=08
00:07.5:3c 08
#

But, after that, when I did a 

# lspci -vv -s 0:7.5
00:07.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio 
Controller (rev 50)
        Subsystem: Biostar Microtech Int'l Corp: Unknown device 0032
        Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR-
        Interrupt: pin C routed to IRQ 11
        Region 0: I/O ports at dc00 [size=256]
        Region 1: I/O ports at e000 [size=4]
        Region 2: I/O ports at e400 [size=4]
        Capabilities: [c0] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-


After some experience (like rebooting... arg!) i tried:

# lspci -vv -H1 -s 0:7.5
<cut>
        Interrupt: pin C routed to IRQ 8
        Region 0: I/O ports at dc00
<cut>

So, it seems that either I cannot change the Interrupt line number throught 
software (and the -H1 is tricky) or the /proc/pci (and /proc/bus/pci) is not 
getting updated.

Is that a problem or am I missing the point?

P.S.: Please Reply direct to me (or send me a copy) because I can not 
"afford" the traffic of linux-kernel. :)

-- 
 Raphael Derosso Pereira - DephiNit

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    / dephinit@softhome.net /
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