From owner-freebsd-mobile  Wed Jan 17 20:26:50 2001
Delivered-To: freebsd-mobile@freebsd.org
Received: from netrinsics.com (unknown [211.101.228.66])
	by hub.freebsd.org (Postfix) with ESMTP id 1294337B400
	for <freebsd-mobile@freebsd.org>; Wed, 17 Jan 2001 20:26:32 -0800 (PST)
Received: (from robinson@localhost)
	by netrinsics.com (8.11.1/8.11.1) id f0HMF7w59249
	for freebsd-mobile@freebsd.org; Wed, 17 Jan 2001 22:15:07 GMT
	(envelope-from robinson)
Date: Wed, 17 Jan 2001 22:15:07 GMT
From: Michael Robinson <robinson@netrinsics.com>
Message-Id: <200101172215.f0HMF7w59249@netrinsics.com>
To: freebsd-mobile@freebsd.org
Subject: No, I mean *really* reset the DSP
Sender: owner-freebsd-mobile@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

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




To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-mobile" in the body of the message