i have the same problem too. I reformated my laptop and no it doesn't recognise my sound device either.
My laptop spec is lengthy so I apologise, and i have shortened it down by 1/5! but I hope someone can help me from all this info! I have already tried installing realtek ac97. (I've reformatted the laptop before and installed this with something else and it fixed my problem but I can't remember what the "something else" was)
<<< System Summary >>>
> Mainboard : Notebook MIM2220
> Chipset : Intel i910GML/i915GMS
> Processor : Intel Pentium M @ 1696 MHz
> Physical Memory : 256 MB (1 x 256 DDR2-SDRAM )
> Video Card : Intel Corporation 82915GM/GMS, 82910GML Integrated Graphics Device
> Hard Disk : SAMSUNG (40 GB)
> DVD-Rom Drive : HL-DT-ST DVDRAM GMA-4082N
> Network Card : Realtek Semiconductor RT8139 (A/B/C/810x/813x/C+) Fast Ethernet Adapter
> Network Card : Intel Corporation PRO/Wireless 2200BG Network Connection
> Operating System : Microsoft Windows XP Professional 5.01.2600 Service Pack 2
> DirectX : Version 9.0c
>> General Information
Manufacturer : Insyde Software Corporation
Version : M2.00
Date : 05/19/2006 (mm/dd/yyyy)
Address : 0x0 on 512 KB
DMI Version : 2.3
> Chipset : Intel i910GML/i915GMS
>> NorthBridge Information
Architecture : Direct Media Interface (DMI)
Manufacturer : Intel (Mitac)
Codename : Alviso
Revision : C1
Bus Speed : 99.7 MHz
FSB Frequency : 399 MHz (QDR)
FSB max. Support : 533 MHz
RAM max. Support : DDR2 (533 MHz)
>> Video Information
Integrated Controller : Yes
Enabled : Yes
Frame Buffer : 8192 KB
<<< Video >>>
>> Monitor Information #1
Monitor : Plug and Play Monitor
Linked on : Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family
Resolution : 1280x800
Working desktop : 1280x770
Main monitor : Yes
> Monitor Type : Plug and Play Monitor
>> General Information
Product ID : MS_A34C
Manufacture : 2002
Video Input Type : Digital in 0.7/0.3v
Aspect Ratio : 16:10
Gamma Factor : 3.55
DPMS Active-Off : Yes
DPMS Suspend : No
DPMS Standby : No
EDID version : 1.3
> Video Card : Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family
>> General Information
Manufacturer : Intel Corporation (Mitac)
Model : Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family
Bus Type : PCI
Total Memory : 128 MB
Texture Memory : 117 MB
Processor : Intel(R) 915GM/GMS,910GML Express Chipset
Converter : Internal
Refresh Rate (min/max) : 60/60 Hz
>> Video Bios Information
Date : 08/20/20
Version : Hardware Version 0.0
Driver : 6.14.10.4764
Region Code : Installed
Region : 1
User Changes : 4
Vendor Changes : 4
RPC Phase II : Yes
<<< Multimedia >>>
> Device Audio : 82801FB (ICH6) High Definition Audio Controller
>> General Information
Manufacturer : Mitac
Version : 1.0
Output Stream : 4
Input Stream : 4
Bidirectionnal Stream : No
64-bit support : Yes
Mode : High Definition Audio (HDA)
Manufacturer : Realteck
Codec ID : 10EC0260
Codec Revision : 1.004
> Device multimedia : AVIVideo
>> General Information
Device Fullname : AVIVideo
Device Alias : AVIVideo
Peripheral Type : digitalvideo
>> Device Information
Name : Video for Windows
Version : 1.1
>> Device Capabilities
CommandEJECT : No
CommandPLAY : Yes
CommandRECORD : No
CommandSAVE : No
CommandAUDIO : Yes
CommandVIDEO : Yes
CommandFILES : Yes
>> Video Capabilities
CommandFREEZE : No
CommandLOCK : No
CommandREVERSE : Yes
CommandSTRETCH : Yes
CommandSTRETCH INPUT : No
CommandTEST : Yes
CommandSTILL : No
CommandPALETTES : Yes
> Device multimedia : CDAudio
>> General Information
Device Fullname : CDAudio
Device Alias : CDAudio
Peripheral Type : cdaudio
>> Device Information
Name : CD Audio
>> Device Capabilities
CommandEJECT : Yes
CommandPLAY : Yes
CommandRECORD : No
CommandSAVE : No
CommandAUDIO : Yes
CommandVIDEO : No
CommandFILES : No
> Device multimedia : Sequencer
>> General Information
Device Fullname : Sequencer
Device Alias : Sequencer
Peripheral Type : sequencer
>> Device Information
Name : MIDI Sequencer
>> Device Capabilities
CommandEJECT : No
CommandPLAY : No
CommandRECORD : No
CommandSAVE : No
CommandAUDIO : No
CommandVIDEO : No
CommandFILES : No
> Device multimedia : WaveAudio
>> General Information
Device Fullname : WaveAudio
Device Alias : WaveAudio
Peripheral Type : waveaudio
>> Device Information
Name : Sound
> Device multimedia : MPEGVideo
>> General Information
Device Fullname : MPEGVideo
Device Alias : MPEGVideo
Peripheral Type : digitalvideo
>> Device Information
Name : DirectShow
Version : 6.04.2600.0
>> Device Capabilities
CommandEJECT : No
CommandPLAY : Yes
CommandRECORD : No
CommandSAVE : No
CommandAUDIO : Yes
CommandVIDEO : Yes
CommandFILES : Yes
>> Video Capabilities
CommandFREEZE : No
CommandLOCK : No
CommandREVERSE : No
CommandSTRETCH : Yes
CommandSTRETCH INPUT : No
CommandTEST : Yes
CommandSTILL : No
CommandPALETTES : Yes
CommandWINDOWS : Yes
> Audio Compression : Microsoft IMA ADPCM CODEC
>> General Information
Version : 4.0
Short Name : Microsoft IMA ADPCM
Description : Compresses and decompresses IMA ADPCM audio data.
Copyright : Copyright (C) 1992-1996 Microsoft Corporation
Status : Enabled
> Audio Compression : Microsoft ADPCM CODEC
>> General Information
Version : 4.0
Short Name : MS-ADPCM
Description : Compresses and decompresses Microsoft ADPCM audio data.
Copyright : Copyright (C) 1992-1996 Microsoft Corporation
Status : Enabled
> Audio Compression : Microsoft CCITT G.711 A-Law and u-Law CODEC
>> General Information
Version : 4.0
Short Name : Microsoft CCITT G.711
Description : Compresses and decompresses CCITT G.711 A-Law and u-Law audio data.
Copyright : Copyright (c) 1993-1996 Microsoft Corporation
Status : Enabled
> Audio Compression : Microsoft GSM 6.10 Audio CODEC
>> General Information
Version : 4.0
Short Name : Microsoft GSM 6.10
Description : Compresses and decompresses audio data conforming to the ETSI-GSM (European Telecommunications Standards Institute-Groupe Special Mobile) recommendation 6.10.
Copyright : Copyright (C) 1993-1996 Microsoft Corporation
Status : Enabled
> Audio Compression : DSP Group TrueSpeech(TM) Software CODEC
>> General Information
Version : 1.0
Short Name : TrueSpeech(TM)
Description : Compresses and decompresses DSP Group TrueSpeech(TM) audio data.
Copyright : Copyright (C) 1993-1996 DSP Group, Inc.
Status : Enabled
> Audio Compression : Microsoft G.723.1 CODEC
>> General Information
Version : 1.2
Short Name : Microsoft G.723.1
Description : Compresses and decompresses G.723.1 audio data.
Copyright : Copyright © 1996 Intel Corporation and Microsoft Corporation
Status : Enabled
> Audio Compression : Windows Media Audio
>> General Information
Version : 4.2
Short Name : WM-AUDIO
Description : Compresses and decompresses audio data.
Copyright : Copyright (C) Microsoft Corporation, 1999 - 2001
Status : Enabled
> Audio Compression : Sipro Lab Telecom ACELP.net audio codec
>> General Information
Version : 3.2
Short Name : ACELP.net
Description : ACELP.net audio encoder/decoder. For licensing please access HTTP: //www.sipro.com
Copyright : Copyright © 1995-99 Sipro Lab Telecom Inc., Montreal
Status : Enabled
> Audio Compression : Indeo® audio software
>> General Information
Version : 2.5
Short Name : Indeo® audio software
Description : Indeo® audio software
Copyright : Copyright © 1997 Intel Corporation
Status : Enabled
> Audio Compression : Fraunhofer IIS MPEG Layer-3 Codec (advanced)
>> General Information
Version : 1.9
Short Name : MPEG Layer-3 Codec
Description : bitrates up to 56kBit/s, mono and stereo codec (advanced)
Copyright : Copyright © 1996-1999 Fraunhofer Institut Integrierte Schaltungen IIS
Status : Enabled
> Audio Compression : Microsoft PCM Converter
>> General Information
Version : 5.0
Short Name : MS-PCM
Description : Converts frequency and bits per sample of PCM audio data.
Copyright : Copyright (C) 1992-1996 Microsoft Corporation
Status : Enabled
>> Connection Information
Device : Realtek RTL8139 Family PCI Fast Ethernet NIC
LAN : Yes
RAS : No
Share to LAN : No
Share to WAN : Yes
Firewall enabled : Yes
Shared Connection : No
Default connection : No
> Network Card : Realtek RTL8139 Family PCI Fast Ethernet NIC

please can someone help me!