Hi all,
I'm having a problem getting my on-the-motherboard sound to work with
16-bit samples. 8 bit works Ok, but 16 bit is silent, which suggests
a DMA conflict or problem.
The card is a SoundBlaster Vibra16 PnP (PnP string is "Creative ViBRA16X
PnP"). The preferred configuration from pnpdump is:
(CONFIGURE CTL00f0/-1 (LD 0
# ANSI string -->Audio<--
# Multiple choice time, choose one only !
# Start dependent functions: priority preferred
# IRQ 5.
# High true, edge sensitive interrupt (by default)
(INT 0 (IRQ 5 (MODE +E)))
# First DMA channel 1.
# 8 bit DMA only
# Logical device is not a bus master
# DMA may execute in count by byte mode
# DMA may not execute in count by word mode
# DMA channel speed in compatible mode
(DMA 0 (CHANNEL 1))
# Next DMA channel 3.
# 8 bit DMA only
# Logical device is not a bus master
# DMA may execute in count by byte mode
# DMA may not execute in count by word mode
# DMA channel speed in compatible mode
(DMA 1 (CHANNEL 3))
... IO ports that look fine ...
The weird thing is that there are two 8-bit DMA channels listed here
(as opposed to an 8-bit and a 16-bit channel). At first I thought this
was pnpdump acting up on me, and I tried to configure the 2nd channel on
DMA 5, 6, and 7 without success. Then I ran into a mail on the Web from
someone who had this card and got it working (presumably on Win95) after
solving a DMA conflict over channel 3 with the BIOS setup of his lp port.
I had the same setting on my motherboard, but even with it disabled, I
got "bad or missing DMA channel" errors loading sound.o with the second
channel set to 3.
So it appears that I've got a broken chipset that identifies as a SB16 but
supports two 8 bit channels instead of the normal 8/16. Has anyone got
this working right under Linux? Does the SoundBlaster driver for 2.0.x
support it? I don't want to start mucking around in the sound code
without asking a _lot_ of people first.
Please, no "get a real sound card" responses. It's my work machine, so
either I have sound or I don't. :-)
thanks,
Mike Touloumtzis
