Sabayon 9: Sound stopped working

[truth is life]

My laptop abruptly stopped producing any sound (aside from that associated with normal operation, drive sounds and the like) yesterday after I used a pair of earphones and later restarted the computer. I have adjusted every setting I can find (alsamixer, in-application volume settings, the keyboard volume and mute buttons) and it has done absolutely nothing; the speakers don't seem to produce any noise whatsoever, and neither do the earphones when plugged in. This is the first time I have ever used earphones, but it does seem a bit unlikely that they could possibly be the cause of the problem. All the following, however, is with the earphones not plugged in.

uname -a:

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Linux Derpy 3.4.0-sabayon #1 SMP Wed Jul 18 23:06:31 UTC 2012 x86_64 Pentium(R) Dual-Core CPU T4200 @ 2.00GHz GenuineIntel GNU/Linux

lspci -v:

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00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09)
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, fast devsel, latency 0
   Capabilities: [e0] Vendor Specific Information: Len=0a <?>
   Kernel driver in use: agpgart-intel
   Kernel modules: intel-agp

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device 1862
   Flags: bus master, fast devsel, latency 0, IRQ 47
   Memory at fd800000 (64-bit, non-prefetchable) [size=4M]
   Memory at d0000000 (64-bit, prefetchable) [size=256M]
   I/O ports at cc00 [size=8]
   Expansion ROM at <unassigned> [disabled]
   Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
   Capabilities: [d0] Power Management version 3
   Kernel driver in use: i915
   Kernel modules: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
   Subsystem: ASUSTeK Computer Inc. Device 1862
   Flags: bus master, fast devsel, latency 0
   Memory at fdd00000 (64-bit, non-prefetchable) [size=1M]
   Capabilities: [d0] Power Management version 3

00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03) (prog-if 00 [UHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 16
   I/O ports at c880 [size=32]
   Capabilities: [50] PCI Advanced Features
   Kernel driver in use: uhci_hcd
   Kernel modules: uhci-hcd

00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03) (prog-if 00 [UHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 21
   I/O ports at c800 [size=32]
   Capabilities: [50] PCI Advanced Features
   Kernel driver in use: uhci_hcd
   Kernel modules: uhci-hcd

00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03) (prog-if 00 [UHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 19
   I/O ports at c480 [size=32]
   Capabilities: [50] PCI Advanced Features
   Kernel driver in use: uhci_hcd
   Kernel modules: uhci-hcd

00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03) (prog-if 20 [EHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 18
   Memory at fdefbc00 (32-bit, non-prefetchable) [size=1K]
   Capabilities: [50] Power Management version 2
   Capabilities: [58] Debug port: BAR=1 offset=00a0
   Capabilities: [98] PCI Advanced Features
   Kernel driver in use: ehci_hcd
   Kernel modules: ehci-hcd

00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
   Subsystem: Santa Cruz Operation Device 1043
   Flags: bus master, fast devsel, latency 0, IRQ 46
   Memory at fdef4000 (64-bit, non-prefetchable) [size=16K]
   Capabilities: [50] Power Management version 2
   Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
   Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
   Capabilities: [100] Virtual Channel
   Capabilities: [130] Root Complex Link
   Kernel driver in use: snd_hda_intel
   Kernel modules: snd-hda-intel

00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03) (prog-if 00 [Normal decode])
   Flags: bus master, fast devsel, latency 0
   Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
   Capabilities: [40] Express Root Port (Slot-), MSI 00
   Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
   Capabilities: [90] Subsystem: ASUSTeK Computer Inc. Device 1867
   Capabilities: [a0] Power Management version 2
   Capabilities: [100] Virtual Channel
   Capabilities: [180] Root Complex Link
   Kernel driver in use: pcieport
   Kernel modules: shpchp

00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03) (prog-if 00 [Normal decode])
   Flags: bus master, fast devsel, latency 0
   Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
   Memory behind bridge: fdf00000-fdffffff
   Capabilities: [40] Express Root Port (Slot-), MSI 00
   Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
   Capabilities: [90] Subsystem: ASUSTeK Computer Inc. Device 1867
   Capabilities: [a0] Power Management version 2
   Capabilities: [100] Virtual Channel
   Capabilities: [180] Root Complex Link
   Kernel driver in use: pcieport
   Kernel modules: shpchp

00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03) (prog-if 00 [Normal decode])
   Flags: bus master, fast devsel, latency 0
   Bus: primary=00, secondary=03, subordinate=04, sec-latency=0
   I/O behind bridge: 0000d000-0000dfff
   Memory behind bridge: fe000000-feafffff
   Prefetchable memory behind bridge: 00000000fa000000-00000000fcffffff
   Capabilities: [40] Express Root Port (Slot+), MSI 00
   Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
   Capabilities: [90] Subsystem: ASUSTeK Computer Inc. Device 1867
   Capabilities: [a0] Power Management version 2
   Capabilities: [100] Virtual Channel
   Capabilities: [180] Root Complex Link
   Kernel driver in use: pcieport
   Kernel modules: shpchp

00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 (rev 03) (prog-if 00 [Normal decode])
   Flags: bus master, fast devsel, latency 0
   Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
   Capabilities: [40] Express Root Port (Slot-), MSI 00
   Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
   Capabilities: [90] Subsystem: ASUSTeK Computer Inc. Device 1867
   Capabilities: [a0] Power Management version 2
   Capabilities: [100] Virtual Channel
   Capabilities: [180] Root Complex Link
   Kernel driver in use: pcieport
   Kernel modules: shpchp

00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03) (prog-if 00 [Normal decode])
   Flags: bus master, fast devsel, latency 0
   Bus: primary=00, secondary=06, subordinate=06, sec-latency=0
   I/O behind bridge: 0000e000-0000efff
   Memory behind bridge: feb00000-febfffff
   Prefetchable memory behind bridge: 00000000bde00000-00000000bdffffff
   Capabilities: [40] Express Root Port (Slot+), MSI 00
   Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
   Capabilities: [90] Subsystem: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6
   Capabilities: [a0] Power Management version 2
   Capabilities: [100] Virtual Channel
   Capabilities: [180] Root Complex Link
   Kernel driver in use: pcieport
   Kernel modules: shpchp

00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) (prog-if 00 [UHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 23
   I/O ports at c400 [size=32]
   Capabilities: [50] PCI Advanced Features
   Kernel driver in use: uhci_hcd
   Kernel modules: uhci-hcd

00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) (prog-if 00 [UHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 19
   I/O ports at c080 [size=32]
   Capabilities: [50] PCI Advanced Features
   Kernel driver in use: uhci_hcd
   Kernel modules: uhci-hcd

00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) (prog-if 00 [UHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 18
   I/O ports at c000 [size=32]
   Capabilities: [50] PCI Advanced Features
   Kernel driver in use: uhci_hcd
   Kernel modules: uhci-hcd

00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0, IRQ 23
   Memory at fdefb800 (32-bit, non-prefetchable) [size=1K]
   Capabilities: [50] Power Management version 2
   Capabilities: [58] Debug port: BAR=1 offset=00a0
   Capabilities: [98] PCI Advanced Features
   Kernel driver in use: ehci_hcd
   Kernel modules: ehci-hcd

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) (prog-if 01 [Subtractive decode])
   Flags: bus master, fast devsel, latency 0
   Bus: primary=00, secondary=07, subordinate=07, sec-latency=32
   Capabilities: [50] Subsystem: ASUSTeK Computer Inc. Device 1867

00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, medium devsel, latency 0
   Capabilities: [e0] Vendor Specific Information: Len=0c <?>
   Kernel modules: iTCO_wdt

00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03) (prog-if 01 [AHCI 1.0])
   Subsystem: ASUSTeK Computer Inc. Device 1867
   Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 45
   I/O ports at bc00 [size=8]
   I/O ports at b880 [size=4]
   I/O ports at b800 [size=8]
   I/O ports at b480 [size=4]
   I/O ports at b400 [size=32]
   Memory at fdefb000 (32-bit, non-prefetchable) [size=2K]
   Capabilities: [80] MSI: Enable+ Count=1/16 Maskable- 64bit-
   Capabilities: [70] Power Management version 3
   Capabilities: [a8] SATA HBA v1.0
   Capabilities: [b0] PCI Advanced Features
   Kernel driver in use: ahci

02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
   Subsystem: AzureWave AW-NE785 / AW-NE785H 802.11bgn Wireless Full or Half-size Mini PCIe Card
   Flags: bus master, fast devsel, latency 0, IRQ 17
   Memory at fdff0000 (64-bit, non-prefetchable) [size=64K]
   Capabilities: [40] Power Management version 3
   Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
   Capabilities: [60] Express Legacy Endpoint, MSI 00
   Capabilities: [100] Advanced Error Reporting
   Capabilities: [140] Virtual Channel
   Capabilities: [160] Device Serial Number 00-15-17-ff-ff-24-14-12
   Capabilities: [170] Power Budgeting <?>
   Kernel driver in use: ath9k
   Kernel modules: ath9k

06:00.0 Ethernet controller: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0)
   Subsystem: ASUSTeK Computer Inc. Device 14f5
   Flags: bus master, fast devsel, latency 0, IRQ 48
   Memory at febc0000 (64-bit, non-prefetchable) [size=256K]
   I/O ports at ec00 [size=128]
   Capabilities: [40] Power Management version 2
   Capabilities: [48] MSI: Enable+ Count=1/1 Maskable- 64bit+
   Capabilities: [58] Express Endpoint, MSI 00
   Capabilities: [100] Advanced Error Reporting
   Capabilities: [180] Device Serial Number ff-39-40-4f-00-26-18-ff
   Kernel driver in use: ATL1E
   Kernel modules: atl1e


lsusb:

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Bus 001 Device 002: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC Webcam / CNF7129
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub


lsmod:

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Module                  Size  Used by
xt_hl                   1088  6
ip6t_rt                 1760  3
nf_conntrack_ipv6       4776  6
nf_defrag_ipv6          5325  1 nf_conntrack_ipv6
ipt_REJECT              1904  1
xt_LOG                  9336  1
xt_limit                1432  2
xt_tcpudp               2112  18
xt_addrtype             2224  4
xt_state                 976  12
ip6table_filter         1072  1
ip6_tables             13967  2 ip6t_rt,ip6table_filter
ipv6                  242765  42 nf_conntrack_ipv6,nf_defrag_ipv6
nf_conntrack_netbios_ns      896  0
nf_conntrack_broadcast     1085  1 nf_conntrack_netbios_ns
nf_nat_ftp              1360  0
nf_nat                 12036  1 nf_nat_ftp
nf_conntrack_ipv4       8906  8 nf_nat
nf_defrag_ipv4          1150  1 nf_conntrack_ipv4
nf_conntrack_ftp        5016  1 nf_nat_ftp
nf_conntrack           51308  8 nf_conntrack_ipv6,xt_state,nf_conntrack_netbios_ns,nf_conntrack_broadcast,nf_nat_ftp,nf_nat,nf_conntrack_ipv4,nf_conntrack_ftp
iptable_filter          1120  1
ip_tables              13045  1 iptable_filter
x_tables               13437  12 xt_hl,ip6t_rt,ipt_REJECT,xt_LOG,xt_limit,xt_tcpudp,xt_addrtype,xt_state,ip6table_filter,ip6_tables,iptable_filter,ip_tables
ath9k                  70299  0
mac80211              191701  1 ath9k
ath9k_common            1809  1 ath9k
ath9k_hw              300954  2 ath9k,ath9k_common
uvcvideo               54983  0
i915                  319639  3
videobuf2_core         15080  1 uvcvideo
snd_hda_codec_via      27392  1
snd_hda_intel          19352  3
ath                    13316  3 ath9k,ath9k_common,ath9k_hw
videodev               77816  1 uvcvideo
asus_laptop            14152  0
atl1e                  22768  0
drm_kms_helper         20647  1 i915
drm                   173252  4 i915,drm_kms_helper
snd_hda_codec          65040  2 snd_hda_codec_via,snd_hda_intel
media                   7986  2 uvcvideo,videodev
snd_hwdep               4542  1 snd_hda_codec
snd_pcm                56359  2 snd_hda_intel,snd_hda_codec
i2c_algo_bit            4122  1 i915
snd_timer              14262  1 snd_pcm
snd                    45343  12 snd_hda_codec_via,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
video                  10046  1 i915
intel_agp               9384  1 i915
intel_gtt              10607  3 i915,intel_agp
i2c_core               14904  5 i915,videodev,drm_kms_helper,drm,i2c_algo_bit
videobuf2_vmalloc       1753  1 uvcvideo
coretemp                4712  0
iTCO_wdt               11496  0
snd_page_alloc          5925  2 snd_hda_intel,snd_pcm
videobuf2_memops        1703  1 videobuf2_vmalloc
iTCO_vendor_support     1617  1 iTCO_wdt
serio_raw               3528  0
microcode               9003  0
cfg80211              130592  3 ath9k,mac80211,ath
joydev                  8096  0
pcspkr                  1520  0
sparse_keymap           2329  1 asus_laptop
xts                     2773  0
gf128mul                5338  1 xts
sha512_generic          4545  0
sha1_generic            1787  0
aes_x86_64              7340  0
virtio_pci              6011  0
virtio_blk              5657  0
virtio_net             11429  0
virtio_console         13214  0
virtio_balloon          3893  0
virtio_ring             4002  5 virtio_pci,virtio_blk,virtio_net,virtio_console,virtio_balloon
virtio                  3245  5 virtio_pci,virtio_blk,virtio_net,virtio_console,virtio_balloon
sha256_generic          9549  0
iscsi_tcp               7676  0
tg3                   117108  0
e1000                  86604  0
fuse                   56448  1
xfs                   414374  0
nfs                   220422  0
nfs_acl                 1983  1 nfs
auth_rpcgss            26370  1 nfs
lockd                  51820  1 nfs
sunrpc                145175  4 nfs,nfs_acl,auth_rpcgss,lockd
jfs                   140033  0
reiserfs              206220  0
ext4                  233921  2
jbd2                   44066  1 ext4
ext3                  106523  0
jbd                    37038  1 ext3
ext2                   53476  0
mbcache                 4529  3 ext4,ext3,ext2
scsi_wait_scan           695  0
sl811_hcd               8903  0
ohci_hcd               17564  0
uhci_hcd               18690  0
ehci_hcd               33618  0
sx8                    10965  0
imm                     8661  0
parport                26727  1 imm
pata_pcmcia             9621  0
pcmcia                 29272  1 pata_pcmcia


cat /proc/asound/card0/codec#* | grep -i codec:

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VIA VT1708S

tail -n 500 /var/log/messages | grep -i --text error:

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Aug  6 19:45:56 localhost kernel: [    4.822761] EXT2-fs (sda5): error: couldn't mount because of unsupported optional features (240)
Aug  6 19:45:56 localhost kernel: [    4.826358] EXT3-fs (sda5): error: couldn't mount because of unsupported optional features (240)
Aug  6 19:45:56 localhost kernel: [    9.993071] Error: Driver 'pcspkr' is already registered, aborting...
Aug  6 19:45:59 localhost NetworkManager[7943]:    SCPlugin-Ifnet: Found error: Unknown config for eth0
Aug  6 19:45:59 localhost NetworkManager[7943]:    SCPlugin-Ifnet: Found error: Unknown config for wlan0
Aug  6 19:45:59 localhost NetworkManager[7943]:    keyfile:     error: invalid or missing connection property 'connection setting not found'
Aug  6 19:46:00 localhost NetworkManager[7943]: <warn> failed to allocate link cache: (-12) Netlink Error (errno = Operation not supported)
Aug  6 19:46:00 localhost NetworkManager[7943]: <warn> bluez error getting default adapter: The name org.bluez was not provided by any .service files


Odd, that last one only had a couple of NetworkManager entries in it the last time I checked...