Ubuntu 12.04 som baixo e com ruído

[roedor]

Migrei há pouco tempo do win7 pro Ubuntu 12.04 e tudo estava funcionando direitinho. Após uma atualização de rotina meu áudio ficou bem baixinho e com um ruído permanente. Alguém já superou este problema?

lspci | grep -i audio
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Caicos HDMI Audio [Radeon HD 6400 Series]
user@user-System-Product-Name:~$ ^C
user@user-System-Product-Name:~$ uname -a
Linux user-System-Product-Name 3.2.0-38-generic #61-Ubuntu SMP Tue Feb 19 12:18:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
user@user-System-Product-Name:~$ ^C
user@user-System-Product-Name:~$ sudo lspci
[sudo] password for user:
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS880 Host Bridge
00:02.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (ext gfx port 0)
00:09.0 PCI bridge: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 4)
00:11.0 SATA controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller (rev 41)
00:14.1 IDE interface: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 IDE Controller (rev 40)
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge (rev 40)
00:14.5 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
00:16.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:16.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Link Control
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Caicos [Radeon HD 6450]
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Caicos HDMI Audio [Radeon HD 6400 Series]
02:00.0 IDE interface: VIA Technologies, Inc. VT6415 PATA IDE Host Controller

uname -a
Linux user-System-Product-Name 3.2.0-38-generic #61-Ubuntu SMP Tue Feb 19 12:18:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

lspci | grep -i audio
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Caicos HDMI Audio [Radeon HD 6400 Series]

cat /proc/asound/pcm
00-00: ALC892 Analog : ALC892 Analog : playback 1 : capture 1
00-01: ALC892 Digital : ALC892 Digital : playback 1
00-02: ALC892 Analog : ALC892 Analog : capture 1
01-03: HDMI 0 : HDMI 0 : playback 1

[Arthur Bernardes]

Amigo, execute em terminal o seguinte comando ==> alsamixer, tire um print da tela, e poste aqui para o Fórum visualizar..!

Execute também em terminal, copie e cole aqui..!

sudo lshw -C sound

[roedor]

Vamos lá Arthur,

Estou com dificuldades para inserir imagens neste fórum, não sei se vai aparecer o print:

lshw -C sound
  *-multimedia           
       descrição: Audio device
       produto: Caicos HDMI Audio [Radeon HD 6400 Series]
       fabricante: Hynix Semiconductor (Hyundai Electronics)
       physical id: 0.1
       informações do barramento: pci@0000:01:00.1
       versão: 00
       largura: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi bus_master cap_list
       configuração: driver=snd_hda_intel latency=0
       recursos: irq:43 memória:feabc000-feabffff
  *-multimedia
       descrição: Audio device
       produto: SBx00 Azalia (Intel HDA)
       fabricante: Hynix Semiconductor (Hyundai Electronics)
       physical id: 14.2
       informações do barramento: pci@0000:00:14.2
       versão: 40
       largura: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuração: driver=snd_hda_intel latency=64
       recursos: irq:16 memória:fe9f8000-fe9fbfff

[roedor]

O print do alsamixer: https://www.dropbox.com/sh/b7h7hzm5ha2hru1/8whFOPgKY1#f:alsamixer.png