Also updated to 2.6.24-21-generic, and also lost all sound, and as above, 
"dmesg|grep snd" gives no output, neither with nor without sudo. I am not on a 
Dell, although I do have what I have found to be an extremely poorly supported 
motherboard, namely the Biostar P4M90-M4. Here are my specs:
:~$ sudo lshw
                   
    description: Desktop Computer
    product: P4M90-M4
    vendor: BIOSTAR Group
    version: Ver:1.0
    serial: OEM
    width: 32 bits
    capabilities: smbios-2.4 dmi-2.4 smp-1.4 smp
    configuration: boot=normal chassis=desktop cpus=2 
uuid=00000000-0000-0000-3412-000078563412
  *-core
       description: Motherboard
       product: P4M90-M4
       vendor: BIOSTAR Group
       physical id: 0
       version: Ver:1.0
       slot: COM1
     *-firmware
          description: BIOS
          vendor: Phoenix Technologies, LTD
          physical id: 0
          version: 6.00 PG (12/21/2007)
          size: 128KiB
          capacity: 448KiB
          capabilities: isa pci pnp apm upgrade shadowing cdboot bootselect 
socketedrom edd int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 
int5printscreen int9keyboard int14serial int17printer int10video acpi usb agp 
ls120boot zipboot biosbootspecification
     *-cpu:0
          description: CPU
          product: Intel(R) Pentium(R) 4 CPU 2.40GHz
          vendor: Intel Corp.
          physical id: 4
          bus info: [EMAIL PROTECTED]
          version: 15.2.9
          slot: Socket 775
          size: 2400MHz
          capacity: 4GHz
          width: 32 bits
          clock: 200MHz
          capabilities: boot fpu fpu_exception wp vme de pse tsc msr pae mce 
cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss 
ht tm pbe pebs bts cid xtpr
          configuration: id=1
        *-cache:0
             description: L1 cache
             physical id: 8
             slot: Internal Cache
             size: 8KiB
             capacity: 20KiB
             capabilities: synchronous internal write-back
        *-cache:1
             description: L2 cache
             physical id: 9
             slot: External Cache
             size: 512KiB
             capacity: 512KiB
             capabilities: synchronous external write-back
        *-logicalcpu:0
             description: Logical CPU
             physical id: 1.1
             width: 32 bits
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 1.2
             width: 32 bits
             capabilities: logical
     *-memory
          description: System Memory
          physical id: 17
          slot: System board or motherboard
          size: 1GiB
          capacity: 1GiB
        *-bank:0
             description: DIMM
             physical id: 0
             slot: A0
             size: 1GiB
        *-bank:1
             description: DIMM [empty]
             physical id: 1
             slot: A1
     *-cpu:1
          physical id: 2
          bus info: [EMAIL PROTECTED]
          version: 15.2.9
          size: 18EHz
          capabilities: ht
          configuration: id=1
        *-logicalcpu:0
             description: Logical CPU
             physical id: 1.1
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 1.2
             capabilities: logical
        *-cache:0
             description: L1 cache
             physical id: 0
             size: 8KiB
        *-cache:1
             description: L2 cache
             physical id: 1
             size: 512KiB
     *-pci:0
          description: Host bridge
          product: P4M900 Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 100
          bus info: [EMAIL PROTECTED]:00:00.0
          version: 00
          width: 32 bits
          clock: 33MHz
          configuration: driver=agpgart-via latency=8 module=via_agp
        *-system UNCLAIMED
             description: PIC
             product: P4M900 I/O APIC Interrupt Controller
             vendor: VIA Technologies, Inc.
             physical id: 0.5
             bus info: [EMAIL PROTECTED]:00:00.5
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: io_x_-apic bus_master
             configuration: latency=0
        *-pci:0
             description: PCI bridge
             product: VT8237 PCI Bridge
             vendor: VIA Technologies, Inc.
             physical id: 1
             bus info: [EMAIL PROTECTED]:00:01.0
             version: 00
             width: 32 bits
             clock: 66MHz
             capabilities: pci pm normal_decode bus_master cap_list
           *-display UNCLAIMED
                description: VGA compatible controller
                product: Chrome9 HC IGP
                vendor: VIA Technologies, Inc.
                physical id: 0
                bus info: [EMAIL PROTECTED]:01:00.0
                version: 01
                width: 32 bits
                clock: 66MHz
                capabilities: pm agp agp-3.0 vga_controller bus_master cap_list
                configuration: latency=32 mingnt=2
        *-pci:1
             description: PCI bridge
             product: P4M900 PCI to PCI Bridge Controller
             vendor: VIA Technologies, Inc.
             physical id: 2
             bus info: [EMAIL PROTECTED]:00:02.0
             version: 80
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress pm msi ht normal_decode bus_master 
cap_list
             configuration: driver=pcieport-driver
        *-pci:2
             description: PCI bridge
             product: P4M900 PCI to PCI Bridge Controller
             vendor: VIA Technologies, Inc.
             physical id: 3
             bus info: [EMAIL PROTECTED]:00:03.0
             version: 80
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress pm msi ht normal_decode bus_master 
cap_list
             configuration: driver=pcieport-driver
        *-ide:0
             description: IDE interface
             product: VIA Technologies, Inc.
             vendor: VIA Technologies, Inc.
             physical id: f
             bus info: [EMAIL PROTECTED]:00:0f.0
             version: 80
             width: 32 bits
             clock: 33MHz
             capabilities: ide pm bus_master cap_list
             configuration: driver=sata_via latency=32 module=sata_via
        *-ide:1
             description: IDE interface
             product: VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE
             vendor: VIA Technologies, Inc.
             physical id: f.1
             bus info: [EMAIL PROTECTED]:00:0f.1
             logical name: scsi2
             logical name: scsi3
             version: 07
             width: 32 bits
             clock: 33MHz
             capabilities: ide pm bus_master cap_list emulated
             configuration: driver=pata_via latency=32 module=pata_via
           *-disk:0
                description: ATA Disk
                product: WDC WD800JB-00ET
                vendor: Western Digital
                physical id: 0
                bus info: [EMAIL PROTECTED]:0.0.0
                logical name: /dev/sda
                version: 77.0
                serial: WD-WMAHL2892200
                size: 74GiB (80GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=5f665f66
              *-volume:0
                   description: EXT3 volume
                   vendor: Linux
                   physical id: 1
                   bus info: [EMAIL PROTECTED]:0.0.0,1
                   logical name: /dev/sda1
                   logical name: /
                   logical name: /dev/.static/dev
                   version: 1.0
                   serial: 95dda7fd-0750-473a-b92a-69874c11387c
                   size: 71GiB
                   capacity: 71GiB
                   capabilities: primary bootable journaled extended_attributes 
large_files huge_files recover ext3 ext2 initialized
                   configuration: created=2008-08-20 22:09:00 filesystem=ext3 
modified=2008-10-28 14:31:29 mount.fstype=ext3 
mount.options=rw,relatime,errors=remount-ro,data=ordered mounted=2008-10-28 
06:57:53 state=mounted
              *-volume:1
                   description: Extended partition
                   physical id: 2
                   bus info: [EMAIL PROTECTED]:0.0.0,2
                   logical name: /dev/sda2
                   size: 2769MiB
                   capacity: 2769MiB
                   capabilities: primary extended partitioned 
partitioned:extended
                 *-logicalvolume
                      description: Linux swap / Solaris partition
                      physical id: 5
                      logical name: /dev/sda5
                      capacity: 2768MiB
                      capabilities: nofs
           *-disk:1
                description: ATA Disk
                product: Hitachi HDT72503
                vendor: Hitachi
                physical id: 0.1.0
                bus info: [EMAIL PROTECTED]:0.1.0
                logical name: /dev/sdb
                version: V54O
                serial: VF1200R2CMK5JA
                size: 298GiB (320GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=000d7e23
              *-volume
                   description: EXT3 volume
                   vendor: Linux
                   physical id: 1
                   bus info: [EMAIL PROTECTED]:0.1.0,1
                   logical name: /dev/sdb1
                   logical name: /media/storage
                   version: 1.0
                   serial: bfe37834-a8da-4f43-81a7-c67928f282e0
                   size: 298GiB
                   capacity: 298GiB
                   capabilities: primary journaled extended_attributes 
large_files huge_files recover ext3 ext2 initialized
                   configuration: created=2007-04-09 13:48:46 filesystem=ext3 
modified=2008-10-28 14:32:07 mount.fstype=ext3 
mount.options=rw,relatime,data=ordered mounted=2008-10-28 14:32:07 state=mounted
           *-cdrom
                description: DVD reader
                product: COMBO LTC-48161H
                vendor: LITE-ON
                physical id: 1
                bus info: [EMAIL PROTECTED]:0.0.0
                logical name: /dev/cdrom
                logical name: /dev/dvd
                logical name: /dev/scd0
                logical name: /dev/sr0
                version: KH0G
                capabilities: removable audio cd-r cd-rw dvd
                configuration: ansiversion=5 status=open
        *-usb:0
             description: USB Controller
             product: VT82xxxxx UHCI USB 1.1 Controller
             vendor: VIA Technologies, Inc.
             physical id: 10
             bus info: [EMAIL PROTECTED]:00:10.0
             version: a0
             width: 32 bits
             clock: 33MHz
             capabilities: pm uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=32 module=uhci_hcd
        *-usb:1
             description: USB Controller
             product: VT82xxxxx UHCI USB 1.1 Controller
             vendor: VIA Technologies, Inc.
             physical id: 10.1
             bus info: [EMAIL PROTECTED]:00:10.1
             version: a0
             width: 32 bits
             clock: 33MHz
             capabilities: pm uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=32 module=uhci_hcd
        *-usb:2
             description: USB Controller
             product: VT82xxxxx UHCI USB 1.1 Controller
             vendor: VIA Technologies, Inc.
             physical id: 10.2
             bus info: [EMAIL PROTECTED]:00:10.2
             version: a0
             width: 32 bits
             clock: 33MHz
             capabilities: pm uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=32 module=uhci_hcd
        *-usb:3
             description: USB Controller
             product: VT82xxxxx UHCI USB 1.1 Controller
             vendor: VIA Technologies, Inc.
             physical id: 10.3
             bus info: [EMAIL PROTECTED]:00:10.3
             version: a0
             width: 32 bits
             clock: 33MHz
             capabilities: pm uhci bus_master cap_list
             configuration: driver=uhci_hcd latency=32 module=uhci_hcd
        *-usb:4
             description: USB Controller
             product: USB 2.0
             vendor: VIA Technologies, Inc.
             physical id: 10.4
             bus info: [EMAIL PROTECTED]:00:10.4
             version: 86
             width: 32 bits
             clock: 33MHz
             capabilities: pm ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=32 module=ehci_hcd
        *-isa
             description: ISA bridge
             product: VT8237A PCI to ISA Bridge
             vendor: VIA Technologies, Inc.
             physical id: 11
             bus info: [EMAIL PROTECTED]:00:11.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: isa pm cap_list
             configuration: latency=0
        *-network
             description: Ethernet interface
             product: VT6102 [Rhine-II]
             vendor: VIA Technologies, Inc.
             physical id: 12
             bus info: [EMAIL PROTECTED]:00:12.0
             logical name: eth0
             version: 7c
             serial: 00:e0:4d:82:f6:3b
             size: 100MB/s
             capacity: 100MB/s
             width: 32 bits
             clock: 33MHz
             capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 
10bt-fd 100bt 100bt-fd autonegotiation
             configuration: autonegotiation=on broadcast=yes driver=via-rhine 
driverversion=1.4.3 duplex=full ip=192.168.1.67 latency=32 link=yes 
maxlatency=8 mingnt=3 module=via_rhine multicast=yes port=MII speed=100MB/s
        *-pci:3
             description: PCI bridge
             product: VT8237A PCI to PCI Bridge
             vendor: VIA Technologies, Inc.
             physical id: 13.1
             bus info: [EMAIL PROTECTED]:00:13.1
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci ht subtractive_decode bus_master cap_list
           *-communication
                description: Modem
                product: HSP MicroModem 56
                vendor: PCTel Inc
                physical id: 3
                bus info: [EMAIL PROTECTED]:04:03.0
                version: 02
                width: 32 bits
                clock: 33MHz
                capabilities: pm hayes_16750 cap_list
                configuration: driver=serial latency=0
     *-pci:1
          description: Host bridge
          product: P4M900 Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 101
          bus info: [EMAIL PROTECTED]:00:00.1
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:2
          description: Host bridge
          product: P4M900 Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 102
          bus info: [EMAIL PROTECTED]:00:00.2
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:3
          description: Host bridge
          product: P4M900 Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 103
          bus info: [EMAIL PROTECTED]:00:00.3
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:4
          description: Host bridge
          product: P4M900 Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 104
          bus info: [EMAIL PROTECTED]:00:00.4
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:5
          description: Host bridge
          product: P4M900 Security Device
          vendor: VIA Technologies, Inc.
          physical id: 105
          bus info: [EMAIL PROTECTED]:00:00.6
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:6
          description: Host bridge
          product: P4M900 Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 106
          bus info: [EMAIL PROTECTED]:00:00.7
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:7
          description: Host bridge
          product: VT8251 Ultra VLINK Controller
          vendor: VIA Technologies, Inc.
          physical id: 107
          bus info: [EMAIL PROTECTED]:00:11.7
          version: 00
          width: 32 bits
          clock: 33MHz
          configuration: latency=32
     *-pci:8
          description: Host bridge
          product: VT8237A Host Bridge
          vendor: VIA Technologies, Inc.
          physical id: 108
          bus info: [EMAIL PROTECTED]:00:13.0
          version: 00
          width: 32 bits
          clock: 33MHz
     *-multimedia UNCLAIMED
          description: Audio device
          product: VIA High Definition Audio Controller
          vendor: VIA Technologies, Inc.
          physical id: 1
          bus info: [EMAIL PROTECTED]:80:01.0
          version: 10
          width: 64 bits
          clock: 33MHz
          capabilities: pm msi pciexpress bus_master cap_list
          configuration: latency=0
     *-scsi:0
          physical id: 3
          bus info: [EMAIL PROTECTED]:3
          logical name: scsi5
          capabilities: emulated scsi-host
          configuration: driver=usb-storage
        *-disk
             description: SCSI Disk
             product: Photosmart C5180
             vendor: HP
             physical id: 0.0.0
             bus info: [EMAIL PROTECTED]:0.0.0
             logical name: /dev/sdc
             version: 1.00
             capabilities: removable
             configuration: ansiversion=2
           *-medium
                physical id: 0
                logical name: /dev/sdc
     *-scsi:1
          physical id: 5
          bus info: [EMAIL PROTECTED]:2
          logical name: scsi4
          capabilities: emulated scsi-host
          configuration: driver=usb-storage
        *-cdrom
             description: DVD-RAM writer
             product: DVD A  DH20A3H
             vendor: ATAPI
             physical id: 0.0.0
             bus info: [EMAIL PROTECTED]:0.0.0
             logical name: /dev/cdrom1
             logical name: /dev/dvd1
             logical name: /dev/scd1
             logical name: /dev/sr1
             version: YP5X
             capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
             configuration: status=open

I thank you for everything that you do.

-- 
no sound after update to 2.6.24-21-generic
https://bugs.launchpad.net/bugs/283790
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