you may try to press Fn+F6 to check
and
http://forums.lenovo.com/t5/X-Series-ThinkPad-Laptops/X201-no-external-sound-after-undocking-makeshift-fix/td-p/568647
another article for your reference, hope some useful info.

On Wed, May 2, 2012 at 6:14 AM, <[email protected]> wrote:

> I installed System Update, and then everything else to install.   Some
> quirks I discovered:
>
> I seem to be in a perpetual update loop to install the Rescue and
> Recovey Cumulative WER fix.
>
> I still don't have external speaker sound, but the volume buttons will
> adjust headphone volume and beep when pressed (through the headphones).
> I'm not sure what's the expected behavior when the Thinkpad button is
> pressed.
>
> The (left) click button on the trackpad seems to be mapped to right-click,
> despite explicitly mapping the button back to left-click.
>
> I have a feeling this Thinkpad was opened up and perhaps not
> re-assembled correctly.   I may open it up anyway and reseat the
> trackpad cable and the external speaker cable.
>
>
>
>
> On Mon, Apr 30, 2012 at 2:58 PM, David Ross <[email protected]> wrote:
> >
>  > FWIW, the volume/mute buttons will only work if you install the Lenovo
> > "Hotkey" driver for them.
> >
> > David
> >
> > --------------------------------------------------
> > From: <[email protected]>
> > Sent: Monday, April 30, 2012 7:29 AM
> > To: <[email protected]>
> > Subject: [Thinkpad] Thinkpad T30 generates no external sound
> >
> > I installed Windows XP Pro from a generic OEM disk.   During Windows
> Update,
> > I let Microsoft install its audio driver.    I pressed the volume and
> mute
> > buttons on the power panel, but got no reaction.  I then installed
> Lenovo's
> > audio drivers.   There's still no external sound.  I do have headphone
> jack
> > audio, but no external speaker audio.
> >
> > I'm not sure if I needed to install other utilities.   What should I
> > consider next if I want to get external speaker sound?
> >
> >
> >
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>



-- 

Regards
Xufeng Chen
-----------------------------------
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