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Old July 26, 2012, 06:02 PM
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Default Laptop sound is screwed up - unuseable. help

I recently replaced the monitor on my acer 7720.
I installed Win 8 on a partition for dual boot, then nuked it and am running win 7 only.

I made a video of the problem which is here: Laptop sound. is there any fix? - YouTube

Any ideas. The only thing I can do is disable the sound driver in Device Manager. That makes ALL sound go away.
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Old July 26, 2012, 06:13 PM
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Sounds like the audio is being "polled" continuously. Have you undone everything you did when you installed the new monitor? Could be you've got a short in one of the cables.
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Old July 26, 2012, 07:05 PM
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hmm - as far as i know, I only plugged and unplugged cables for the display/webcam.
does it make sense that only the right speaker would be making that noise?
something else i just noticed - this laptop has a volume wheel. now it doesn't work unless i bring up the volume slider on screen first. it used to work at any time.

i should add that this problem didn't appear immediately after replacing the screen. it has only been noticeable in the last few days - now it has reached a point where I can't listen to anything, it's so choppy.

I'm not sure what to look for. do you know where I can find a repair manual for this laptop? (Acer 7720Z)
...let me google that for myself :)
thanks again.
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Old July 26, 2012, 07:15 PM
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That metronomic (pretty sure I just made a new word.... ;) ) ticking you hear is most definitely (IMO) hardware polling (the bus/motherboard asking the hardware WTF is going on). On a desktop I'd suggest resetting the resources within bios but I'm not sure if that setting is normally available for laptops.

Outside of that... did you do a full re-install of win7 after you had win8 on it? Maybe there's a resource conflict being caused by a fubarred driver. (Wouldn't necessarily have to be audio driver, could be something else fighting for the same resource).
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Old July 26, 2012, 07:35 PM
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Argh - I was *just* going to write that I fixed it when the annoying right speaker "heartbeat" started up again.

I uninstalled the device in dev manager, then rescanned for hardware changes and windows did its thing and tada - normal sound....for about 2 minutes.

I didn't reinstall windows after nuking win 8. Should I "reset to factory defaults" in bios?
This seems like a very low level problem. But then again I'm pretty sure that devicemanager can't move a wire that has shorted out. WEIRD..
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Old July 27, 2012, 07:41 AM
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Do you get the same sound effects when you plug in headphones? That will tell you if its the speaker or a software problem. (I suspect its software). What happens when you try the motherboard driver instead of the default windows one?
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Old July 27, 2012, 12:24 PM
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Hmm...I upgraded the audio drivers to realtek 6.0.1.6662 (19/6/2012).

Rebooted, and the right speaker was making the same sound as in the video above.
I disabled the driver and the problem didn't stop.
Then I tried the headphones and the speaker stopped it's bleating. Sound through the headphones was good (unlike before)..
Unplugged the headphones and everything is fine. No idea what's going on. But at least it works for now.

Thanks
Mike
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