My laptop (Hyperdata Expor CD100) has an ESS 688 sound system, which
is getting significant air time in comp.sys.laptops as being extremely
SB-compatible. Unfortunately, I'm not finding this to be terribly
much the case, from the Linux perspective. I've tried quite a few
kernel sound configurations, trying to pick the thing up properly and
have had very limited success. It seems that it is "plain" (8-bit)
SB-compatible, but the obvious acid test is to try to run Doom, in
which case sndserver complains, "Could not play signed 16 data," and
makes a truly hideous noise when permitted to continue.
/dev/sndstat on this system shows:
Config options: 35e02
Type 1: OPL-2/OPL-3 FM
Type 2: SoundBlaster
Type 6: SoundBlaster16
Type 7: SB16 MIDI
Type 10: MS Sound System
(MS Sound System at 0x530 irq 10 drq 3)
SoundBlaster at 0x220 irq 5 drq 1
(SoundBlaster16 at 0x220 irq 5 drq 6)
(SB16 MIDI at 0x330 irq 5 drq 0)
OPL-2/OPL-3 FM at 0x388 irq 0 drq 0
0: SoundBlaster Pro 3.1
0: Yamaha OPL-3
0: System Timer
1 mixer(s) installed
The obvious question is, Where is the 16-bit DMA channel in order to
be SB16-compatible? I've tried forcing particular sound
configurations with LILO boot options (e.g., sound=0x622051,0x138800,
sound=0x622056,0x138800, sound=0x222051,0x622056,0x138800, I even
tried sound=0xa22051,0x138800 to attempt MS Sound System), all of
which result in /dev/sndstat showing no useful entries as available.
I've tried talking to tech.sup at Hyperdata, who have been simply
stunning in their lack of informativeness.
If it matters, I am able to, e.g., "cat /dev/audio > /some/file" and
thereafter record sounds around me with the builtin mike, and can also
"cat /some/file > /dev/audio" and get the playback of those sounds.
Would anyone else with an ESS 688 have an idea what's going on here?
Is the ESS restricted to 8-bit compatibility? If the sound driver
authors are listening, are there plans for ESS-specific enhancements?
The system is:
486DX4/100, 20Mb/810Mb, ESS 688 normally seen at 0x220,IRQ5,DMA1,
CDROM at 0x300 for which there is not yet a Linux driver.
(DOS/Windows definitely sees the sound device at 0x220/5/1.)
Built from the InfoMagic March 1995 set, upgraded to kernel 1.2.11 +
modules 1.2.8 + PCMCIA 2.6.3.