Re: Realtek AC97 outputs very low
- From: "Dale Brisket" <[nospam]jhansman@xxxxxxxxxxx>
- Date: Fri, 16 Dec 2005 03:23:13 GMT
"Paul" <nospam@xxxxxxxxxx> wrote in message
news:nospam-1512051357030001@xxxxxxxxxxxxxxxx
> In article <1134669948.904215.5150@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "song"
> <song.ahn@xxxxxxxxx> wrote:
>
> > I have A8V deluxe and have a problem with onboard Realtek sound
> > chipset. Suddenly, the line-out volume became very low.
> >
> > I leveled max both volume and wave out controls, but the signal is not
> > strong enough. It is more likely under medium output as compared
> > before. I usually listen music through headphone. And it is a little
> > annoying because I have to hear low sound all the time.
> >
> > Is there a hidden setting to increase output gain? Did I fry the
> > amplifier ? (I am sure even it has a amp)
> > Thanks.
> > ==song==
>
> According to the ALC850 datasheet, both the "front-out" and
> "surround" have amplifiers capable of driving a 20 ohm load
> to 1 volt. That would traditionally be suitable for driving
> headphones (at least some headphones are a lighter load
> than that, at 32 ohms - higher ohms is lighter).
>
> In the AC97 register interface, there are two options for
> both amplifiers. The output can be turned off completely, or
> the amplifier modules can be bypassed. With the amplifier
> bypassed, it has the driving strength of say, the
> center/sub output. Somewhere between 200 ohms and 1000 ohms,
> which is very weak, and is most suited to driving the input
> on amplified computer speakers. In that state, if you
> connect headphones, the output would be barely audible.
>
> The ALC850 has universal audio jack detection. When you
> plug in the headphones, does the Realtek driver recognize
> that headphones have been plugged in ? Make sure that when
> you do plug them in, the software is set up to drive "headphones"
> and not "computer speakers". It is possible that one of those
> software selections, would cause the amplifiers to be bypassed.
>
> (PDF page 38, MX7A bit 6 set to 1, makes headphones weak.)
>
> ftp://210.51.181.211/pc/ac97/alc850/ALC850_DataSheet_1.4.pdf
>
> 1) Make sure that if jack sensing is enabled, and a dialog box
> pops up to verify what was plugged in, that the software
> is told they are "headphones".
> 2) Try driving the headphones from the Surround output instead.
> Some audio control panel software has a "cloning" mode, where
> the same stereo signal, can be fed to more than one output jack.
> See if the Realtek software supports that.
>
> You might have a look around, and see if a later AC97 driver is
> available for the ALC850.
>
> The current driver version at RealTek is A3.80 . This is a
> _big_ download. RealTek download servers are usually pretty
> slow, so try all three and see which one is faster. Uninstall
> the old driver, and try a newer one.
>
>
http://www.realtek.com.tw/downloads/dlac97-2.aspx?lineid=5&famid=12&series=8&Software=True
>
> HTH,
> Paul
I've been following your replies here with some interest. You always seem to
have lots of useful info willingly shared, and nary a bad work for anyone.
Most rare for Usenet. I hope you're there when I'm in need. Thanks.
.
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