why would i *not* be able to update a register in ac97#0-0+regs when it's read write?

From: "John Utz" <John.Utz@dmxmusic.com>
To: alsa-devel@lists.sourceforge.net
Subject: why would i *not* be able to update a register in ac97#0-0+regs when it's read write?
Date: Fri, 16 Feb 2007 17:08:13 -0800	[thread overview]
Message-ID: <F8FB97052F1BEF409F7842E960E49B5AAAF896@sea-exch-01.na.corp.dmxmusic.com> (raw)

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Hello;

I have debugging turned on (--with-debug=detect) and the file is listed as writable:

ls -l /proc/asound/card0/codec97#0/ac97#0-0+regs
-rw-r--r-- 1 root root 0 Feb 16 08:47 /proc/asound/card0/codec97#0/ac97#0-0+regs

but i get no joy in the file:

cat /proc/asound/card0/codec97#0/ac97#0-0+regs | grep 0:60
0:60 = 0000

echo 60 1 > /proc/asound/card0/codec97#0/ac97#0-0+regs
cat /proc/asound/card0/codec97#0/ac97#0-0+regs | grep 0:60
0:60 = 0000

the doc asserts that the register is rw:

Note that this is from the docs for the via vt1618

Vendor Defined Register (Page ID = 00h)
UAJ Control
Index: 60h                                                           Default Value: 0038h
    Bit     Attr. Description
   15:6      RO   Reserved
    5:4     RW    UAJ_2 (pin 21/22) Control
                  00: Reserved
                  01: Output from DAC_2 without analog mixing
                  10: Input as Line-In signal
                  11: Input as MIC1 & MIC2 signals (default)
    3:2     RW    UAJ_1 (pin 23/24) Control
                  00: Reserved
                  01: Output from DAC_1 without analog mixing
                  10: Input as Line-In signal (default)
                  11: Input as MIC1 & MIC2 signals
    1:0     RW    UAJ_0 (pin 35/36) Control
                  00: Output from DAC_0 with analog mixing (default)
                  01: Output from DAC_0 without analog mixing
                  10: Input as Line-In signal
                  11: Input as MIC1 & MIC2 signals

i believe that i want to set these to the 01 setting so that i can get surround out from Universal Audio Jacks on our MSI motherboard samples

am i barking up the wrong tree here?

tnx!

johnu

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