[aclug-L] Help unraveling another IRQ conflict

["Bates, Rod" <Rod.Bates@xxxxxxxxxxxxxxxxxx>]

I replaced a defectivie sound card, and now I am back to having
another of the dreaded interrupt conflicts (I think).  I need
help unravelling it.   

I am running Red Hat 6.1, with kernel 2.2.12-20.
As I understand, this has PnP support built in.  Am I
right so far?  

The modem is PnP, on ttyS2, and was working before I switched
sound cards, on an earlier relase without PnP support.  It was using
IRQ5, and there was a setserial to this effect.  I tried with and
without this command, to no avail.  My /var/log/messages shows
PnP recognizing the modem and sound cards,  and shows how it
set up the sound card, but says nothing about
how it set up the modem.  I says it gave IRQ 5 to the sound card. 

Later, when starting the serial driver, it shows ttyS2 getting 
IRQ4, the default, which conflicts with ttyS0, where my mouse
is.  

I could do a setserial to something else, but how do I know what
interrupt isapnp configured the board to use?  And why doesn't
this information get automatically communicated to the serial
driver, the way it apparently does for the sound driver?  

I can get a CD player to play an audio CD, and a mixer application
to change the CD volume and master volume.  I presume this
means the sound card is working.  

Here are what I think are the relevant excerpts from /var/log/messages:

...........

Jan 18 11:18:17 localhost rc.sysinit: Checking root filesystem succeeded 
Jan 18 11:18:17 localhost isapnp: Board 1 has Identity 74 ff ff ff ff 31 09
14 3e:  OPT0931 Serial No -1 [checksum 74] 
Jan 18 11:18:17 localhost isapnp: Board 2 has Identity b6 00 01 a9 f3 10 13
b0 4e:  SUP1310 Serial No 109043 [checksum b6] 
Jan 18 11:18:17 localhost isapnp: OPT0931/-1[0]{AUX0                }: ---
Enabled OK 
Jan 18 11:18:17 localhost isapnp: OPT0931/-1[1]{OPTi Audio 16       }: Ports
0x534 0x380 0x220 0xE0C; IRQ5 DMA0 DMA1 --- Enabled OK 
Jan 18 11:18:18 localhost isapnp: OPT0931/-1[2]{Game Port           }: Port
0x200; --- Enabled OK 
Jan 18 11:18:18 localhost isapnp: OPT0931/-1[3]{MPU401              }: Port
0x300; IRQ7 --- Enabled OK 
Jan 18 11:18:18 localhost rc.sysinit: Setting up ISA PNP devices succeeded 
Jan 18 11:18:18 localhost rc.sysinit: Remounting root filesystem in
read-write mode succeeded 

.........

Jan 18 11:20:46 localhost kernel: Detected PS/2 Mouse Port. 
Jan 18 11:20:46 localhost kernel: Serial driver version 4.27 with MANY_PORTS
MULTIPORT SHARE_IRQ enabled 
Jan 18 11:20:46 localhost kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A 
Jan 18 11:20:46 localhost kernel: ttyS01 at 0x02f8 (irq = 3) is a 16550A 
Jan 18 11:20:46 localhost kernel: ttyS02 at 0x03e8 (irq = 4) is a 16550A 
Jan 18 11:20:46 localhost kernel: pty: 256 Unix98 ptys configured 
Jan 18 11:20:46 localhost kernel: apm: BIOS not found. 

........

Jan 18 11:20:49 localhost kernel: Adding Swap: 130748k swap-space (priority
-1) 
Jan 18 11:20:49 localhost kernel: Soundblaster audio driver Copyright (C) by
Hannu Savolainen 1993-1996 
Jan 18 11:20:49 localhost kernel: ad1848/cs4248 codec driver Copyright (C)
by Hannu Savolainen 1993-1996 
Jan 18 11:20:49 localhost kernel: MAD16 audio driver Copyright (C) by Hannu
Savolainen 1993-1996 
Jan 18 11:20:49 localhost kernel: CDROM Disabled. 
Jan 18 11:20:49 localhost kernel: Joystick port enabled. 
Jan 18 11:20:49 localhost kernel: YM3812 and OPL-3 driver Copyright (C) by
Hannu Savolainen, Rob Hooft 1993-1996 
Jan 18 11:20:51 localhost inet: inetd startup succeeded

.......

Jan 18 11:55:02 localhost modprobe: can't locate module char-major-108
Jan 18 11:55:04 localhost kernel: CSLIP: code copyright 1989 Regents of the
University of California 
Jan 18 11:55:04 localhost kernel: PPP: version 2.3.7 (demand dialling) 
Jan 18 11:55:04 localhost kernel: PPP line discipline registered. 
Jan 18 11:55:04 localhost kernel: registered device ppp0 
Jan 18 11:55:04 localhost pppd[611]: pppd 2.3.10 started by root, uid 0
Jan 18 11:55:05 localhost chat[612]: abort on (BUSY)
Jan 18 11:55:05 localhost chat[612]: abort on (NO CARRIER)
Jan 18 11:55:05 localhost chat[612]: abort on (VOICE)
Jan 18 11:55:05 localhost chat[612]: abort on (NO DIALTONE)
Jan 18 11:55:05 localhost chat[612]: abort on (NO DIAL TONE)
Jan 18 11:55:05 localhost chat[612]: abort on (NO ANSWER)
Jan 18 11:55:05 localhost chat[612]: send (ATZ^M)
Jan 18 11:55:06 localhost chat[612]: expect (OK)
Jan 18 11:55:19 localhost chat[612]: ^M
Jan 18 11:55:51 localhost chat[612]: alarm
Jan 18 11:55:51 localhost chat[612]: Failed
Jan 18 11:55:51 localhost pppd[611]: Connect script failed
Jan 18 11:55:52 localhost pppd[611]: Exit.
Jan 18 12:03:20 localhost PAM_pwdb[598]: (su) session closed for user root
Jan 18 12:03:43 localhost PAM_pwdb[625]: authentication failure; (uid=500)
-> root for su service
Jan 18 12:03:50 localhost PAM_pwdb[626]: (su) session opened for user root
by (uid=500)
Jan 18 12:08:47 localhost PAM_pwdb[626]: (su) session closed for user root
Jan 18 12:08:58 localhost kernel: SCSI device sda: hdwr sector= 512 bytes.
Sectors= 2091050 [1021 MB] [1.0 GB] 

...........
 Rodney Bates