I experience this exact problem with an Inspiron 6400 too. It does not happen 
in all cases, but it is rare when it's working. Happens in three ways:
1. When I plug in the headphone, both the speaker and the headphone are muted
2. When I plug out the the headphone(which worked properly) the speaker is 
still muted.(plugging back the headphone works once again) 
3. When I plug in headphone jack, both the speaker and the headphone is 
working. 

Here are the previously mentioned information from DebuggingSoundProblems:
[EMAIL PROTECTED]:~$ tail -2 /proc/asound/oss/sndstat
Mixers:
0: SigmaTel STAC9200

[EMAIL PROTECTED]:~$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 31 [100%] [on]
  Front Right: Playback 31 [100%] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 235 [92%]
  Front Right: Playback 235 [92%]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined cswitch cswitch-joined
  Playback channels: Mono
  Capture channels: Mono
  Mono: Playback [on] Capture [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 15
  Front Left: Capture 0 [0%] [on]
  Front Right: Capture 0 [0%] [on]
Simple mixer control 'Capture Mux',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 4
  Front Left: 2 [50%]
  Front Right: 2 [50%]
Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line'
  Item0: 'Mic'

[EMAIL PROTECTED]:~$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 31 [100%] [on]
  Front Right: Playback 31 [100%] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 235 [92%]
  Front Right: Playback 235 [92%]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined cswitch cswitch-joined
  Playback channels: Mono
  Capture channels: Mono
  Mono: Playback [on] Capture [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 15
  Front Left: Capture 0 [0%] [on]
  Front Right: Capture 0 [0%] [on]
Simple mixer control 'Capture Mux',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 4
  Front Left: 2 [50%]
  Front Right: 2 [50%]
Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line'
  Item0: 'Mic'

[EMAIL PROTECTED]:~$ sudo lspci -nv
00:00.0 0600: 8086:27a0 (rev 03)
        Subsystem: 1028:01bd
        Flags: bus master, fast devsel, latency 0
        Capabilities: [e0] Vendor Specific Information

00:02.0 0300: 8086:27a2 (rev 03)
        Subsystem: 1028:01bd
        Flags: bus master, fast devsel, latency 0, IRQ 169
        Memory at eff00000 (32-bit, non-prefetchable) [size=512K]
        I/O ports at eff8 [size=8]
        Memory at d0000000 (32-bit, prefetchable) [size=256M]
        Memory at efec0000 (32-bit, non-prefetchable) [size=256K]
        Capabilities: [90] Message Signalled Interrupts: 64bit- Queue=0/0 
Enable-
        Capabilities: [d0] Power Management version 2

00:02.1 0380: 8086:27a6 (rev 03)
        Subsystem: 1028:01bd
        Flags: bus master, fast devsel, latency 0
        Memory at eff80000 (32-bit, non-prefetchable) [size=512K]
        Capabilities: [d0] Power Management version 2

00:1b.0 0403: 8086:27d8 (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, fast devsel, latency 0, IRQ 225
        Memory at efebc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] Message Signalled Interrupts: 64bit+ Queue=0/0 
Enable-
        Capabilities: [70] Express Unknown type IRQ 0
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Unknown (5)

00:1c.0 0604: 8086:27d0 (rev 01)
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=0b, subordinate=0b, sec-latency=0
        Memory behind bridge: efd00000-efdfffff
        Capabilities: [40] Express Root Port (Slot+) IRQ 0
        Capabilities: [80] Message Signalled Interrupts: 64bit- Queue=0/0 
Enable+
        Capabilities: [90] #0d [0000]
        Capabilities: [a0] Power Management version 2
        Capabilities: [100] Virtual Channel
        Capabilities: [180] Unknown (5)

00:1c.3 0604: 8086:27d6 (rev 01)
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=0c, subordinate=0d, sec-latency=0
        I/O behind bridge: 0000d000-0000dfff
        Memory behind bridge: efa00000-efcfffff
        Prefetchable memory behind bridge: 00000000e0000000-00000000e0100000
        Capabilities: [40] Express Root Port (Slot+) IRQ 0
        Capabilities: [80] Message Signalled Interrupts: 64bit- Queue=0/0 
Enable+
        Capabilities: [90] #0d [0000]
        Capabilities: [a0] Power Management version 2
        Capabilities: [100] Virtual Channel
        Capabilities: [180] Unknown (5)

00:1d.0 0c03: 8086:27c8 (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0, IRQ 217
        I/O ports at bf80 [size=32]

00:1d.1 0c03: 8086:27c9 (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0, IRQ 225
        I/O ports at bf60 [size=32]

00:1d.2 0c03: 8086:27ca (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0, IRQ 233
        I/O ports at bf40 [size=32]

00:1d.3 0c03: 8086:27cb (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0, IRQ 50
        I/O ports at bf20 [size=32]

00:1d.7 0c03: 8086:27cc (rev 01) (prog-if 20)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0, IRQ 217
        Memory at ffa80000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] Debug port

00:1e.0 0604: 8086:2448 (rev e1) (prog-if 01)
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=03, subordinate=03, sec-latency=32
        Memory behind bridge: ef900000-ef9fffff
        Capabilities: [50] #0d [0000]

00:1f.0 0601: 8086:27b9 (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0
        Capabilities: [e0] Vendor Specific Information

00:1f.2 0101: 8086:27c4 (rev 01) (prog-if 80)
        Subsystem: 1028:01bd
        Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 209
        I/O ports at <ignored>
        I/O ports at <ignored>
        I/O ports at <ignored>
        I/O ports at <ignored>
        I/O ports at bfa0 [size=16]
        Capabilities: [70] Power Management version 2

00:1f.3 0c05: 8086:27da (rev 01)
        Subsystem: 1028:01bd
        Flags: medium devsel, IRQ 4
        I/O ports at 10c0 [size=32]

03:00.0 0200: 14e4:170c (rev 02)
        Subsystem: 1028:01af
        Flags: bus master, fast devsel, latency 64, IRQ 209
        Memory at ef9fe000 (32-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 2

03:01.0 0c00: 1180:0832 (prog-if 10)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 64, IRQ 177
        Memory at ef9fd800 (32-bit, non-prefetchable) [size=2K]
        Capabilities: [dc] Power Management version 2

03:01.1 0805: 1180:0822 (rev 19) (prog-if 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 64, IRQ 58
        Memory at ef9fd400 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 2

03:01.2 0880: 1180:0843 (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, medium devsel, latency 0, IRQ 11
        Memory at ef9fd500 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 2

03:01.3 0880: 1180:0592 (rev 0a)
        Subsystem: 1028:01bd
        Flags: medium devsel, IRQ 11
        Memory at ef9fd600 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 2

03:01.4 0880: 1180:0852 (rev 05)
        Subsystem: 1028:01bd
        Flags: medium devsel, IRQ 11
        Memory at ef9fd700 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 2

0b:00.0 0280: 14e4:4311 (rev 01)
        Subsystem: 1028:0007
        Flags: bus master, fast devsel, latency 0, IRQ 169
        Memory at efdfc000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 2
        Capabilities: [58] Message Signalled Interrupts: 64bit- Queue=0/0 
Enable-
        Capabilities: [d0] Express Legacy Endpoint IRQ 0
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [13c] Virtual Channel

[EMAIL PROTECTED]:~$ asoundconf list
Names of available sound cards:
Intel

[EMAIL PROTECTED]:~$ cat /etc/asound.conf ~/.asoundrc*
cat: /etc/asound.conf: No such file or directory
cat: /home/tolmi/.asoundrc*: No such file or directory

[EMAIL PROTECTED]:~$ dmesg > dmesg.txt

[EMAIL PROTECTED]:~$ sudo cat /proc/interrupts
           CPU0       CPU1       
  0:     582890          0    IO-APIC-edge  timer
  1:       3301          0    IO-APIC-edge  i8042
  8:         66          0    IO-APIC-edge  rtc
  9:          2          0   IO-APIC-level  acpi
 12:        657          0    IO-APIC-edge  i8042
 14:      62948          0    IO-APIC-edge  libata
 15:       5876          0    IO-APIC-edge  libata
 50:     463824          0   IO-APIC-level  uhci_hcd:usb4
 58:          0          0   IO-APIC-level  sdhci:slot0
169:      57076          0   IO-APIC-level  ndiswrapper, [EMAIL 
PROTECTED]:0000:00:02.0
177:          2          0   IO-APIC-level  ohci1394
209:          0          0   IO-APIC-level  eth0
217:          3          0   IO-APIC-level  uhci_hcd:usb1, ehci_hcd:usb5
225:        280          0   IO-APIC-level  uhci_hcd:usb2, HDA Intel
233:     106148          0   IO-APIC-level  uhci_hcd:usb3
NMI:          0          0 
LOC:     582712     582711 
ERR:          0
MIS:          0

** Attachment added: "dmesg of my Dell Inspiron 6400"
   http://librarian.launchpad.net/6821835/dmesg.txt

-- 
Speakers not muted when headphones are plugged in
https://launchpad.net/bugs/37055

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