Ok, after much experimenting!!! I have located the problem which seems to be devs:usb in update4. When i replace this folder with a devs/usb folder from an earlier update, it works!!!!!!!!!!! If i put back the new devs/usb from update4, it fecks up sound!!!!


thanks to those who helped...and tried to ;)
---




I'm writing this as my A1-C has been giving me major sound problems for a few days now. With the help of many we tried to solve it, but we ran out of ideas now...

here's how it all went down....

Updating to version 4 of OS4 went fine apart from minor bugs, these were handled when i installed it from scratch. But a few days after while doing nothing in particular, sound starting acting up whenever i had disk-access.

problem discription: If i play any sort of sound, and meanwhile start accessing disk for whatever use, the sound gets distorted until the diskaccess is done.

It sounds like bus-noise or something. It doesn't matter from where i play the audio, if it's a regular harddrive,flash-ide card or even an cd-rom.

10 mins ago i did a last attempt where i installed OS4 Update 4 from scratch, installed new slb and played some .aiff files from Street Fighter 2 CD32 ;)
Started amipdf up, and sound was borked while loading amipdf.

system: A1-C in a travla case with top lid taken off.

Things tried:
-Hardware changes
Tried different speakers
Tried switching to a more powerful PSU.
Tried unhooking all inneccessary stuff to USB.
Removed front USB connection.
Removed front Line-In connection.
Removed SIL-card and running with just a flash-card as memory on internal a1-ide.

-software
Tried with different ahi.device from update3.
Compared ahi.prefs to other users.
Tried AmigaAmp, TuneNet, Amplifier, AiffPlayer(inside OS4)
Tried a1ide + sil kickstart modules from update 3.
Tried booting into NO JIT update 4.
Blacklisted AmigaAmp from JIT
Ran mem-tester. No issues apparently.
Checked max-transfer + mask.
Tried switching to old and newer level-2 loader.
Tried installing OS4 Update 1 + Update 2 + Update 3 from scratch :> same problem

We're out of ideas....

only thing left is to test with a sound pci-card i guess....everything seems to point at the onboard sound chip...

Last edited by Haymigga on 17-Feb-2006 at 05:11 PM.
Last edited by Haymigga on 17-Feb-2006 at 05:10 PM.
Last edited by Haymigga on 15-Feb-2006 at 08:16 PM.

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@All

Just for reference (in case anyone wanted to know) this is what bus-noise sounds like: bus-noise

Last edited by mattk on 15-Feb-2006 at 09:18 PM.

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Matt

@mattk

so what can cauze such a noise? ... bad grounding?

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I also have that bus-noise here. Every 30 minutes. The weird thing is that I never heard it after 22 o'clock PM.

Last edited by hatschi on 15-Feb-2006 at 09:50 PM.

@mattk

Very amusing

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baaaah.. help haymigga instead of talking about transportation sounds ...

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@Toaks

Quote:

baaaah.. help haymigga instead of talking about transportation sounds ...

Hehe, sorry haymigga.

I'm afraid I'm no expert on hardware, so have no clues about what could be the problem.

Last edited by mattk on 15-Feb-2006 at 10:57 PM.

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@Haymigga

Hmm.. what happened a few days ago?

What happens if you play from the Ram disk?

@Haymigga


From wegsters BIG LIST

Just in case you haven't tried that yet



Quote:

My sound on my micro is borked, I can't hear it or it's very low! From the ud4 PDF: Quote: Users of a μA1 or CMI-based audio cards might find that sound output is silent after the updated. If this is the case, open AHI prefs, and set the Output slider to “Line out” instead of “Digital out”.

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he knows... that is not his problem

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@capehill

doesn't matter if i play from ramdisk either...or internet radio for that matter....


yesterday night i took the entire mobo out of it's casing, thinking it could have been some sort of interference from the metal case.

didn't work of course...

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@Haymigga

this is so sad man :I

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@Haymigga

Please disconnect every onboard audio connector (cd-rom, mic-in, line-in) and only connect your speakers to the green output on the back.
Now play an aiff or mp3 and fire up Mixer. Mute every output except PCM and Master. See what happens.

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@DaveAE

still distorted :(

@whose

yep, tried switching psu's to a beefier fullsize ATX

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@Haymigga

Well, in this case it´s a real problem... last chance could be that one of the components has lost ground connection, so that noise will come in from other components. But finding this is near to impossible without the right equipment. Sry...

greetz

@all

Ok, after much experimenting!!! I have located the problem which seems to be devs:usb in update4. When i replace this folder with a devs/usb folder from an earlier update, it magically works!! If i put back the new devs/usb from update4, it fecks up sound!!!!


thanks to those who helped...and tried to ;)

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@Haymigga
Ok, that's just _odd_.

Glad your issue is resolved, but I'd love to know _why_ replacing the USB drivers made any difference here??!

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@Haymigga

Huh? Works (mostly) flawlessy here... USB doesn't interfere with sound for me. Sound is clear except for some quiet crackles on the left channel caused by the PSU.

Any special USB devices connected? Or maybe you used the "internal" (rear) USB instead of the "external" (front) USB connectors? I ask, because I didn't connect the "external" USB ports, only the "internal" ports are connected here and sound is clear with Update4 USB components.

Strange...

Greetz

@whose

I can now add that if i remove my USB mouse, there is no distortion.

But as said, when update1 devs/usb in use and usb mouse plugged in, there is no distortion either. So it's still something regarding usb mouse in devs/usb in update4 if you ask me ... that's my guess at least :(

i just tried a different usb mouse to be sure it's not the mouse.

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@Haymigga

I see... I will test it too with several USB mouses... very strange, indeed. Keep us up to date so we can nail it down

greetz

Edit: Tested it with three different mice. MicroShit USB mouse (very old model), Arowana Optical mouse (old one too) and Medion notebook mouse (cheap one, very thin USB cable, not shielded), playing sound with TuneNet. No distortion of the sound when moving the mouse.

But I have an idea: Would you test other mice AND test ALL of them (including your actual one) connected to a SELF POWERED hub (using an external power supply!) with your µA1? It's a well known problem of standard Intel hardware that internal power supply of the USB ports may die, if devices with higher power consumption than the port can deliver are connected (this causes VERY strange effects sometimes!). Maybe something like that has happened to your USB ports, so a self powered hub could be the solution.

Last edited by whose on 17-Feb-2006 at 06:10 PM.