On Thu, 2002-01-10 at 10:38, Siggi Langauf wrote: > On Thu, 10 Jan 2002, Christopher C. Chimelis wrote: > > > > Well, now that I've listened closely to my earphones while plugged to the > > > iBook, I've noticed a very high-pitched sound that occurs roughly every 2 > > > seconds and lasts for about half a second. Any guess what that could be? > > > > I'm still working on the tumbler (aka TAS) driver. I'll listen more > > closely to my headphones when I make the changes to support things other > > than the internal speakers (even those aren't filtered properly right now, > > FYI). > > After a night of sleep and some more listening, I found out that these > sonds occur when there is acces to the hard disk drive. > I'm using ext3, therefore the regular peaks. > When I do something like "find / -type f|xargs cat >/dev/null", I get a > constantly chirping sound (still very high pitch and very low volume...) > > I guess it's a hardware issue, but haven't tried with MacOS yet. > Maybe one could filter that out... > > It's not that bad; I guess you only hear the sound on earphones because > the hard disk would be louder if you tried to listen to the speakers... > > Btw: thanks for your tumbler work! It was really nice to watch more and > more of the sound features appear ;-) > > Maybe you want to have a look at the suspend mode: When pmud puts the > machine to sleep while playing mp3s, I sometimes get strange noises when > it wakes up again. The only way to fix this is to unload/reload the sound > modules...
I had the same problem. The "quickie fix hack" is to reload the dmasound_pmac module. It seems the driver doesn't properly reinitialise the hardware. I had mine yelling some strident noise during 3 minutes before I figured it out.... and I missed a bit of my film, bummer ;) Cheers -- /Bastien Nocera http://hadess.net
