I've just installed pulseaudio (1:0.9.16~test6-3-g57e1-0ubuntu1) on Karmic Alpha 4 and rebooted.
Now my sound output has gone...
When I open Sound Preferences I have the following under each tab:

- Hardware > Choose a device to configure: > (empty field)
- Input > Inpout volume > (Grayed out)
- Input > Choose a device for sound input: > (empty field)
- Output > Choose a device for sound output: > Null Output

My computer is a HP laptop, model DV9850EL.
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This the output for "killall pulseaudio;pulseaudio -vvvv":

I: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
I: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted
D: core-rtclock.c: Timer slack is set to 50 us.
I: core-util.c: Failed to acquire high-priority scheduling: Input/output error
I: main.c: This is PulseAudio 0.9.16-test6-3-g57e1
D: main.c: Compilation host: x86_64-pc-linux-gnu
D: main.c: Compilation CFLAGS: -g -O2 -g -Wall -O3 -Wall -W -Wextra -pipe -Wno-long-long -Winline -Wvla -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wold-style-definition -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wcast-align -Wstrict-aliasing=2 -Wwrite-strings -Wno-unused-parameter -ffast-math -Wp,-D_FORTIFY_SOURCE=2 -fno-common -fdiagnostics-show-option
D: main.c: Running on host: Linux x86_64 2.6.31-7-generic #27-Ubuntu SMP Mon Aug 24 19:18:31 UTC 2009
D: main.c: Found 2 CPUs.
I: main.c: Page size is 4096 bytes
D: main.c: Compiled with Valgrind support: no
D: main.c: Running in valgrind mode: no
D: main.c: Optimized build: yes
D: main.c: All asserts enabled.
I: main.c: Machine ID is d0369a60b29b784df7e93e194a87e78c.
I: main.c: Session ID is d0369a60b29b784df7e93e194a87e78c-1251274101.999419-862063398.
I: main.c: Using runtime directory /home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-runtime.
I: main.c: Using state directory /home/fab/.pulse.
I: main.c: Using modules directory /usr/lib/pulse-0.9.16/modules.
I: main.c: Running in system mode: no
I: main.c: Fresh high-resolution timers available! Bon appetit!
I: cpu-x86.c: CPU flags: MMX SSE SSE2 SSE3 SSSE3 SSE4_1 
I: svolume_mmx.c: Initialising MMX optimized functions.
I: remap_mmx.c: Initialising MMX optimized remappers.
I: svolume_sse.c: Initialising SSE optimized functions.
D: memblock.c: Using shared memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65472
I: module.c: Loaded "module-suspend-on-idle" (index: #0; argument: "").
D: database-tdb.c: Opened TDB database '/home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-device-volumes.tdb'
I: module-device-restore.c: Sucessfully opened database file '/home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-device-volumes'.
I: module.c: Loaded "module-device-restore" (index: #1; argument: "").
D: database-tdb.c: Opened TDB database '/home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-stream-volumes.tdb'
I: module-stream-restore.c: Sucessfully opened database file '/home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-stream-volumes'.
I: module.c: Loaded "module-stream-restore" (index: #2; argument: "").
D: database-tdb.c: Opened TDB database '/home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-card-database.tdb'
I: module-card-restore.c: Sucessfully opened database file '/home/fab/.pulse/d0369a60b29b784df7e93e194a87e78c-card-database'.
I: module.c: Loaded "module-card-restore" (index: #3; argument: "").
I: module.c: Loaded "module-augment-properties" (index: #4; argument: "").
D: cli-command.c: Checking for existance of '/usr/lib/pulse-0.9.16/modules/module-udev-detect.so': success
D: module-udev-detect.c: /dev/snd/controlC0 is accessible: yes
D: module-udev-detect.c: /devices/pci0000:00/0000:00:1b.0/sound/card0 is busy: yes
I: module-udev-detect.c: Found 1 cards.
I: module.c: Loaded "module-udev-detect" (index: #5; argument: "").
D: cli-command.c: Checking for existance of '/usr/lib/pulse-0.9.16/modules/module-bluetooth-discover.so': success
D: dbus-util.c: Successfully connected to D-Bus system bus c91a5d9323e0a3d7a114c9f44a94ed63 as :1.79
D: bluetooth-util.c: dbus: interface=org.freedesktop.DBus, path=/org/freedesktop/DBus, member=NameAcquired
D: bluetooth-util.c: dbus: interface=org.freedesktop.DBus.Introspectable, path=/, member=Introspect
I: module.c: Loaded "module-bluetooth-discover" (index: #6; argument: "").
D: cli-command.c: Checking for existance of '/usr/lib/pulse-0.9.16/modules/module-esound-protocol-unix.so': success
I: module.c: Loaded "module-esound-protocol-unix" (index: #7; argument: "").
I: module.c: Loaded "module-native-protocol-unix" (index: #8; argument: "").
D: cli-command.c: Checking for existance of '/usr/lib/pulse-0.9.16/modules/module-gconf.so': success
I: module.c: Loaded "module-gconf" (index: #9; argument: "").
I: module-default-device-restore.c: Saved default sink 'auto_null' not existant, not restoring default sink setting.
I: module-default-device-restore.c: Saved default source 'auto_null.monitor' not existant, not restoring default source setting.
I: module.c: Loaded "module-default-device-restore" (index: #10; argument: "").
I: module.c: Loaded "module-rescue-streams" (index: #11; argument: "").
D: module-always-sink.c: Autoloading null-sink as no other sinks detected.
I: module-device-restore.c: Restoring volume for sink auto_null.
I: module-device-restore.c: Restoring mute state for sink auto_null.
I: sink.c: Created sink 0 "auto_null" with sample spec s16le 2ch 44100Hz and channel map front-left,front-right
I: sink.c:     device.description = "Null Output"
I: sink.c:     device.class = "abstract"
I: sink.c:     device.icon_name = "audio-card"
I: source.c: Created source 0 "auto_null.monitor" with sample spec s16le 2ch 44100Hz and channel map front-left,front-right
I: source.c:     device.description = "Monitor of Null Output"
I: source.c:     device.class = "monitor"
I: source.c:     device.icon_name = "audio-input-microphone"
D: module-null-sink.c: Thread starting up
D: module-suspend-on-idle.c: Sink auto_null becomes idle, timeout in 5 seconds.
I: module.c: Loaded "module-null-sink" (index: #12; argument: "sink_name=auto_null").
I: module.c: Loaded "module-always-sink" (index: #13; argument: "").
I: module.c: Loaded "module-intended-roles" (index: #14; argument: "").
I: client.c: Created 0 "ConsoleKit Session /org/freedesktop/ConsoleKit/Session2"
D: module-console-kit.c: Added new session /org/freedesktop/ConsoleKit/Session2
I: module.c: Loaded "module-console-kit" (index: #15; argument: "").
I: module.c: Loaded "module-position-event-sounds" (index: #16; argument: "").
I: module.c: Loaded "module-cork-music-on-phone" (index: #17; argument: "").
D: dbus-util.c: Successfully connected to D-Bus session bus 8780e7af92ac1268f24106144a94ed76 as :1.78
D: main.c: Got org.pulseaudio.Server!
I: main.c: Daemon startup complete.
I: client.c: Created 1 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for python2.6
I: client.c: Created 2 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gnome-panel
I: client.c: Created 3 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for firefox
I: client.c: Created 4 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gnome-terminal
I: client.c: Created 5 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for polkit-gnome-authentication-agent-1
I: client.c: Created 6 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gtk-window-decorator
I: client.c: Created 7 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gdm-user-switch-applet
I: client.c: Created 8 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for nautilus
I: client.c: Created 9 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for trashapplet
I: client.c: Created 10 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gnome-power-manager
I: client.c: Created 11 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for indicator-applet
I: client.c: Created 12 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for bluetooth-applet
I: client.c: Created 13 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for nm-applet
I: client.c: Created 14 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gnome-volume-control-applet
I: module-suspend-on-idle.c: Sink auto_null idle for too long, suspending ...
D: sink.c: Suspend cause of sink auto_null is 0x0004, suspending
I: client.c: Created 15 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: module-augment-properties.c: Looking for .desktop file for gnome-settings-daemon
I: client.c: Created 16 "Native client (UNIX socket client)"
D: protocol-native.c: Protocol version: remote 16, local 16
I: protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
D: protocol-native.c: SHM possible: yes
D: protocol-native.c: Negotiated SHM: yes
D: core-subscribe.c: Dropped redundant event due to change event.
D: module-augment-properties.c: Looking for .desktop file for gnome-volume-control-applet
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