The kernel that came with the Feisty CD worked fine as far as muting the speakers when plugging in the headphones, but with the update from -15 to -16 it started having this problem. Output of tail -2 /proc/asound/oss/sndstat: Mixers: 0: Analog Devices AD1986A Output of amixer: Simple mixer control 'Master',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 22 [71%] [on] Front Right: Playback 22 [71%] [on] Simple mixer control 'PCM',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 25 [81%] [3.00dB] [on] Front Right: Playback 25 [81%] [3.00dB] [on] Simple mixer control 'Mic',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Mono Limits: Playback 0 - 31 Mono: Capture [on] Front Left: Playback 30 [97%] [10.50dB] [off] Front Right: Playback 30 [97%] [10.50dB] [off] Simple mixer control 'Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 3 [100%] Front Right: 3 [100%] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 15 Front Left: Capture 15 [100%] [22.50dB] [on] Front Right: Capture 15 [100%] [22.50dB] [on] Simple mixer control 'Mix',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Mono Mono: Capture [off] Simple mixer control 'Caller ID',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'External Amplifier',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'Internal Mic',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Mono Limits: Playback 0 - 31 Mono: Capture [off] Front Left: Playback 17 [55%] [-9.00dB] [off] Front Right: Playback 17 [55%] [-9.00dB] [off] Simple mixer control 'Off-hook',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Output of lspci -nv: 00:00.0 0600: 8086:27a0 (rev 03) Subsystem: 17aa:2061 Flags: bus master, fast devsel, latency 0 Capabilities: [e0] Vendor Specific Information 00:01.0 0604: 8086:27a1 (rev 03) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 Memory behind bridge: d0000000-d1ffffff Prefetchable memory behind bridge: 00000000c0000000-00000000cfffffff Capabilities: [88] Subsystem: 17aa:2062 Capabilities: [80] Power Management version 2 Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable- Capabilities: [a0] Express Root Port (Slot+) IRQ 0 00:1b.0 0403: 8086:27d8 (rev 02) Subsystem: 17aa:2066 Flags: bus master, fast devsel, latency 0, IRQ 22 Memory at d2400000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Capabilities: [70] Express Unknown type IRQ 0 00:1c.0 0604: 8086:27d0 (rev 02) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 Capabilities: [40] Express Root Port (Slot+) IRQ 0 Capabilities: [80] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable- Capabilities: [90] Subsystem: 17aa:2067 Capabilities: [a0] Power Management version 2 00:1c.1 0604: 8086:27d2 (rev 02) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=03, subordinate=03, sec-latency=0 Memory behind bridge: d2000000-d20fffff Capabilities: [40] Express Root Port (Slot+) IRQ 0 Capabilities: [80] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable- Capabilities: [90] Subsystem: 17aa:2068 Capabilities: [a0] Power Management version 2 00:1d.0 0c03: 8086:27c8 (rev 02) (prog-if 00 [UHCI]) Subsystem: 17aa:206b Flags: bus master, medium devsel, latency 0, IRQ 18 I/O ports at 1800 [size=32] 00:1d.1 0c03: 8086:27c9 (rev 02) (prog-if 00 [UHCI]) Subsystem: 17aa:206c Flags: bus master, medium devsel, latency 0, IRQ 19 I/O ports at 1820 [size=32] 00:1d.2 0c03: 8086:27ca (rev 02) (prog-if 00 [UHCI]) Subsystem: 17aa:206d Flags: bus master, medium devsel, latency 0, IRQ 20 I/O ports at 1840 [size=32] 00:1d.3 0c03: 8086:27cb (rev 02) (prog-if 00 [UHCI]) Subsystem: 17aa:206e Flags: bus master, medium devsel, latency 0, IRQ 16 I/O ports at 1860 [size=32] 00:1d.7 0c03: 8086:27cc (rev 02) (prog-if 20 [EHCI]) Subsystem: 17aa:206f Flags: bus master, medium devsel, latency 0, IRQ 18 Memory at d2404000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port 00:1e.0 0604: 8086:2448 (rev e2) (prog-if 01 [Subtractive decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=05, subordinate=09, sec-latency=32 I/O behind bridge: 00002000-00002fff Memory behind bridge: d2100000-d21fffff Prefetchable memory behind bridge: 0000000088000000-000000008bffffff Capabilities: [50] Subsystem: 17aa:2070 00:1f.0 0601: 8086:27b9 (rev 02) Subsystem: 17aa:2071 Flags: bus master, medium devsel, latency 0 Capabilities: [e0] Vendor Specific Information 00:1f.2 0101: 8086:27c4 (rev 02) (prog-if 80 [Master]) Subsystem: 17aa:2072 Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 19 I/O ports at 01f0 [size=8] I/O ports at 03f4 [size=1] I/O ports at 0170 [size=8] I/O ports at 0374 [size=1] I/O ports at 18b0 [size=16] Capabilities: [70] Power Management version 2 00:1f.3 0c05: 8086:27da (rev 02) Subsystem: 17aa:2073 Flags: medium devsel, IRQ 10 I/O ports at 18c0 [size=32] 01:00.0 0300: 10de:01d7 (rev a1) (prog-if 00 [VGA]) Subsystem: 17aa:2065 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at d1000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at d0000000 (64-bit, non-prefetchable) [size=16M] Capabilities: [60] Power Management version 2 Capabilities: [68] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Capabilities: [78] Express Endpoint IRQ 0 03:00.0 0280: 8086:4227 (rev 02) Subsystem: 8086:1011 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at d2000000 (32-bit, non-prefetchable) [size=4K] Capabilities: [c8] Power Management version 2 Capabilities: [d0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Capabilities: [e0] Express Legacy Endpoint IRQ 0 05:01.0 0200: 10ec:8139 (rev 10) Subsystem: 17aa:2074 Flags: bus master, medium devsel, latency 64, IRQ 21 I/O ports at 2000 [size=256] Memory at d2100000 (32-bit, non-prefetchable) [size=256] Capabilities: [50] Power Management version 2 05:04.0 0607: 1524:1410 (rev 01) Subsystem: 17aa:2075 Flags: bus master, medium devsel, latency 168, IRQ 16 Memory at d2102000 (32-bit, non-prefetchable) [size=4K] Bus: primary=05, secondary=06, subordinate=09, sec-latency=176 Memory window 0: 88000000-8bfff000 (prefetchable) Memory window 1: 8c000000-8ffff000 I/O window 0: 00002400-000024ff I/O window 1: 00002800-000028ff 16-bit legacy interface ports at 0001 05:06.0 0c00: 1180:0832 (prog-if 10 [OHCI]) Subsystem: 17aa:2076 Flags: bus master, medium devsel, latency 64, IRQ 22 Memory at d2100800 (32-bit, non-prefetchable) [size=2K] Capabilities: [dc] Power Management version 2 05:06.1 0805: 1180:0822 (rev 19) Subsystem: 17aa:2077 Flags: bus master, medium devsel, latency 64, IRQ 18 Memory at d2100400 (32-bit, non-prefetchable) [size=256] Capabilities: [80] Power Management version 2 05:06.2 0880: 1180:0843 (rev 01) Subsystem: 17aa:2078 Flags: medium devsel, IRQ 5 Memory at d2101000 (32-bit, non-prefetchable) [disabled] [size=256] Capabilities: [80] Power Management version 2 05:06.3 0880: 1180:0592 (rev 0a) Subsystem: 17aa:2079 Flags: medium devsel, IRQ 5 Memory at d2101400 (32-bit, non-prefetchable) [disabled] [size=256] Capabilities: [80] Power Management version 2 05:06.4 0880: 1180:0852 (rev 05) Subsystem: 17aa:207a Flags: medium devsel, IRQ 5 Memory at d2101800 (32-bit, non-prefetchable) [disabled] [size=256] Capabilities: [80] Power Management version 2 Output of asoundconf list: Names of available sound cards: Intel Output of cat /proc/interrupts: CPU0 CPU1 0: 643196 0 IO-APIC-edge timer 1: 2009 0 IO-APIC-edge i8042 8: 25 0 IO-APIC-edge rtc 9: 17725 0 IO-APIC-fasteoi acpi 12: 110717 162674 IO-APIC-edge i8042 14: 82997 0 IO-APIC-edge libata 15: 6415 0 IO-APIC-edge libata 16: 194055 0 IO-APIC-fasteoi uhci_hcd:usb5, yenta, nvidia 17: 412069 0 IO-APIC-fasteoi ipw3945 18: 253388 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2, sdhci:slot0 19: 66 0 IO-APIC-fasteoi uhci_hcd:usb3 20: 32 0 IO-APIC-fasteoi uhci_hcd:usb4 21: 0 0 IO-APIC-fasteoi eth0 22: 172298 0 IO-APIC-fasteoi ohci1394, HDA Intel NMI: 0 0 LOC: 643004 643003 ERR: 0 MIS: 0 Many thanks!