Date: Wed, 17 Jan 2001 22:01:56 GMT From: Michael Robinson <robinson@netrinsics.com> To: freebsd-mobile@freebsd.org Subject: No, I mean *really* reset the DSP Message-ID: <200101172201.f0HM1uP59212@netrinsics.com>
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I have a Dell 5000e running -CURRENT (late December vintage). I can
suspend/resume mostly ok (X requires switching to a text console first, or
it gets confused).
The big problem is that the sound driver doesn't work (no sound at all) after
a suspend/resume cycle. From <sys/soundcard.h> I found this ioctl:
#define SNDCTL_DSP_RESET _IO ('P', 0)
And I wrote this short program:
#include <stdio.h>
#include <fcntl.h>
#include <sys/soundcard.h>
main(int argc, char **argv) {
int file, err;
file = open("/dev/dsp", O_WRONLY);
if (file < 0) {
perror("file error");
}
err = ioctl(file, SNDCTL_DSP_RESET, 0);
if (err) {
perror("ioctl error");
}
}
If I run this program after resuming, instead of complete silence, I get
nasty static noise from any program that uses audio. So, this has an effect,
but it is not restoring the audio to a "freshly booted" state. Short of
hacking up the drivers, does anyone have any suggestions?
-Michael Robinson
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