Re: PR/51784 CVS commit: src/sys/dev

[Paul Goyette <paul%whooppee.com@localhost>]

The following reply was made to PR kern/51784; it has been noted by GNATS.

From: Paul Goyette <paul%whooppee.com@localhost>
To: Nathanial Sloss <nat%netbsd.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost
Subject: Re: PR/51784 CVS commit: src/sys/dev
Date: Sun, 28 May 2017 10:02:07 +0800 (+08)

 OK, I just rebuilt a clean GENERIC kernel and tried it out.  The results 
 are somewhat inconclusive....  :)
 
 Previously, with all default settings, the _volume_ on the /dev/speaker 
 was very high.  Possibly it was so high that the "hum" might have been 
 overdriving of the D-A converter.
 
 Now, with the current kernel, the volume on /dev/speaker is very low, 
 almost inaudible!  So it is not possible for me to determine if the hum 
 has disappeared, or if it has just been reduced proportionately in its 
 amplitude.
 
 Has the Hi-Res-Bell stuff also affected the audio levels?  Perhaps some 
 sort of scaling factor?  Or high-order vs low-order byte values?  (I'm 
 just guessing, I actually have no idea how audio stuff really works!)
 
 
 
 +------------------+--------------------------+----------------------------+
 | Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:          |
 | (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee dot com   |
 | Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd dot org |
 +------------------+--------------------------+----------------------------+