This tutorial is part of the IDT audio installation which you can read here. So after the audio installation sometimes for certain model the audio work just fine after installation but disappear after restart.


1. Download devcon utilities. link below
(link updated on Friday 29 June 2012)

2. Open a notepad and paste the following line,and name the notepad as audiopatch.bat, save the file at c:\patch\ with the name audiopatch.bat. (if the directory c:\patch don't exist create one. The Hardware ID may differ (i never study about the differences between ID) this is commonly what i found. Paste the code


To manually check your hardware ID follow this Guide:

a) Open device manager by click start, select run and type: DEVMGMT.MSC

b) Right click at your audio drivers and select properties like the picture below.

c)then select details.

d) Select Hardware ID by expanding the Device description Drop down menu.

e)Then here you found your hardware ID which circle in red as shown in pic below. (The ID below is for my Desktop, REALTEK Audio so it difference with your ID). right click on it san select copy then paste it as note

3. Then extract file devcon.exe, copy \i386\devcon.exe to the c:\patch\ (in the folder where you save the audiopatch.bat).

4.Now, there are two options here, the simple steps is to right click on the audio patch, send to, desktop, whenever you start your computer double click on it, the sound should work. If you want it to automatically start every time you turn on your laptop. Continue read the tutorial below, the advantage is you don't have to double click every time you start your notebook.


1. click start select run and type regedit.

2. find this value:


expand it by click the + icon
3. click on the run, on the right panel click anywhere and select new - string value( anew string value will appear normally with name new value#1.)

4. right click on the new string you create and rename as audiopatch.
5.double click on it and on the value data write c:\patch\audiopatch.bat


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