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SubjectPROBLEM: AD1816A Sound Failure Upgrading to Kernel-2.4.5 from Kernel-2.2.19

[1.] AD1816A Sound Failure Upgrading to Kernel-2.4.5 from Kernel-2.2.19

[2.] I have been successfully running kernel-2.2.19 on an HP Pavilion
8180 system with an AD1816A sound device. When I installed
kernel-2.4.5, the sound system became erratic. It would
ocassionally produce the correct sounds, but would suddenly
generate severely distorted output.

I noted in the system logs that the AD1816 module reported
"isadmabug=0" under kernel-2.2.19, but was now reporting
"isadmabug=1" under kernel-2.4.5. After searching the source,
it appears that the variable 'isa_dma_bridge_buggy' is now set
in /arch/i386/kernel/setup.c, though I'm not 100% sure of that.
There does not appear to be a configuration variable which
controls this setting either.

As a pure hack, I modified drivers/sound/ad1816.c to include a
line which sets isa_dma_bridge_buggy to zero in function
probe_ad1816() as follows:

/* replace with probe routine */
static int __init probe_ad1816 ( struct address_info *hw_config )
{
ad1816_info *devc = &dev_info[nr_ad1816_devs];
int io_base=hw_config->io_base;
int *osp=hw_config->osp;
int tmp;

printk("ad1816: AD1816 sounddriver Copyright (C) 1998 by Thorsten Knabe\n");

isa_dma_bridge_buggy = 0;

...
}

With this one line change, the sound system works perfectly
again. This is clearly not the best fix, but I hope it helps
isolate the true source of the problem.

[3.] Keywords: sound, ad1816

[4.] Kernel version: Linux version 2.4.5 (root@egor.linux.home)
(gcc version 2.95.4 20010604 (Debian prerelease)) #3 Tue Jun 26
14:35:49 MDT 2001

[5.] N/A

[6.] N/A

[7.]
[7.1]
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux egor.linux.home 2.4.5 #3 Tue Jun 26 14:35:49 MDT 2001 i686 unknown

Gnu C 2.95.4
Gnu make 3.79.1
binutils 2.11.90.0.7
util-linux 2.11d
mount 2.11d
modutils 2.4.6
e2fsprogs 1.22
PPP 2.4.1
Linux C Library 2.2.3
Dynamic linker (ldd) 2.2.3
Procps 2.0.7
Net-tools 1.60
Kbd 1.06
Sh-utils 2.0.11
Modules Loaded ppp_deflate bsd_comp ppp_async ppp_generic slhc ad1816 sound soundcore

[7.2]
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 3
model name : Pentium II (Klamath)
stepping : 3
cpu MHz : 265.914
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov mmx
bogomips : 530.84

[7.3]
ppp_deflate 39136 0 (autoclean)
bsd_comp 4096 0 (autoclean)
ppp_async 6224 0 (autoclean)
ppp_generic 12992 0 (autoclean) [ppp_deflate bsd_comp ppp_async]
slhc 4640 0 (autoclean) [ppp_generic]
ad1816 9232 1 (autoclean)
sound 54544 1 (autoclean) [ad1816]
soundcore 3664 4 (autoclean) [sound]

[7.4]
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
0213-0213 : isapnp read
0376-0376 : ide1
0378-037a : parport0
03c0-03df : vga+
03e8-03ef : serial(set)
03f6-03f6 : ide0
03f8-03ff : serial(set)
0500-050f : AD1816 Sound
0a79-0a79 : isapnp write
0cf8-0cff : PCI conf1
f480-f4ff : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3]
f480-f4ff : tulip
f800-f8ff : Adaptec AIC-7861
fc00-fcff : ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB]
ff80-ff9f : Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II]
ffa0-ffaf : Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
ffa0-ffa7 : ide0
ffa8-ffaf : ide1
00000000-0009efff : System RAM
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000c8000-000cc7ff : Extension ROM
000f0000-000fffff : System ROM
00100000-07ffffff : System RAM
00100000-0021e78f : Kernel code
0021e790-0029abbf : Kernel data
fb000000-fbffffff : ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB]
ffbee000-ffbeefff : Adaptec AIC-7861
ffbee000-ffbeefff : aic7xxx
ffbef000-ffbeffff : ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB]
fff7fc00-fff7fc7f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3]
fff7fc00-fff7fc7f : tulip

[7.5] No lspci utility (??)

[7.6]
Attached devices:
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: SEAGATE Model: ST410800N Rev: 7101
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: HP Model: C5110A Rev: 3701
Type: Processor ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 06 Lun: 00
Vendor: YAMAHA Model: CRW6416S Rev: 1.0b
Type: CD-ROM ANSI SCSI revision: 02

[7.7] None.

[X.] See one line fix in [2.] above.

--
Jim
------------------- Optional Methods -----------------------
Dr James A. Lupo (303) 423-2652
9667 Independence Dr. lupoja@qwest.net
Westminster CO 80021-6845 jalupo@regis.edu
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