Oct 28, 2009

Sound Disappear After Restart - Part 2

Here is the second method for most Compaq CQ which the sound disappear after restart.
this solution regarding to audio works after installing batch file KB835221.

Download the CQaudiosolution: (Link fixed on March 22 2015)

Inside the RAR file there is an audio patch and devcon patch file. Devcon file will solve issue with KB835221 (missing PnP function id). Follow the given instruction below

a) You must install two patches first from Microsoft: KB835221 (UAA version 1.0) and then kb888111 (UAA update version 1.0a)

b) Install the IDT HD Audio driver (you can use your Vista driver from HP site as well)
c) Extract CQAudioSolution.rar you've downloaded
d) Extract devcon.exe self-extracter from Devcon folder extracted in c)
e) Copy devcon.exe from extracted folder in (d) to C:\WINDOWS\SYSTEM32
f) Run Audio path from extracted Audio Path folder in c)
g) Restart
h) You should be able play sound with IDT HD Audio after restart.

However, in Device Manager, there is a exclamation icon on "Audio Device on High Definition Audio Bus". This is installed by KB835221 patch. Just ignore it. The CQAudioSolution will make sure that there is no more issue with missing IDT HD Audio when restarting after installing the IDT HD Audio driver.



  1. thanks bro for your advice, it's really helm me much

  2. thank's very much, your advice helped me for installing soundcard driver of my brother's computer..

  3. broo,, masih ga bisa install audio nya.. pusing nih

  4. Thanks Bro!
    I followed exactly that procedure but no sound is heard when system restarts. Device manager even doesn't show IDT HD Audio Codec..
    If run the UAA patches again, they show and sound is heard but on restart, sound disappears...
    Help me..

  5. Thanks a lot bro..helped me a lot...

  6. Your writing really helped my problem, because it is very difficult to install audio drivers on compaq cq40-321TU notebook with operating system Windows XP SP3

    thanks very much

  7. Dear Bro,
    I follow both of the sound disappear after restart part 1 & part 2, Sound can work, but if be booting, the Start Window sound can’t hear (sound scheme: Windows default), after that sound work normally.
    Laptop : Compaq Pressario CQ40-530TU
    OS : Microsoft Windows XP version 2002 professional Service Pack 3
    Thanks n Warm Regards,

  8. HDMI driver can't download...please hel me...

  9. hi i think your tutorial works but.. some tutorials are not working.

  10. if there are any comments that may improve this post, i would gratefully appreciate that, can you describe in details, sure it will help me and other stoo

  11. thanks brother i solved my problem with u r procedure.pradeep

  12. thanks gan, benar2 membantu !!
    it works !

  13. mas aq ikti cara di atas emag bisa audio bisa berjala, tapi seelah di restart speaker iternalya bisu alias ga berfugsi tapi kla pake headset atau speker eksternal bisa. mohon penerahannya mas. lukman.alkarim@gmail.com

  14. link 4share dah di delete..
    tlg uplod lagi bro

    Lapi q cq40-532TU