Problema no som

[leticiarina]

Boa tarde, pessoal!
Sou iniciante no Ubuntu e estou com problemas no áudio. É a segunda vez que instalo o sistema no mesmo notebook e é a segunda vez que fico sem nenhum som, mesmo com fone de ouvido. Estou utilizando o 14.10 mas tive problema com 14.04 também. Já procurei várias soluções, testei os alto-falantes, verifiquei se não estava no mudo, alterei as configurações através do alsamixer, reinstalei o pulseaudio, pacotes alsa, procurei o driver pra instalar e o sistema afirma que não tem nenhum driver complementar necessário...
lspci

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00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 3 (rev 02)
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 02)
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 02)
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [IDE mode] (rev 02)
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02)
03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
0a:04.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
0a:04.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 1394 Host Controller
0a:04.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card Reader (SD/MMC/MS/MS PRO/xD)
0a:04.3 SD Host controller: Texas Instruments PCIxx12 SDA Standard Compliant SD Host Controller
0a:08.0 Ethernet controller: Intel Corporation PRO/100 VE Network Connection (rev 02)


aplay -l

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**** Lista de Dispositivos PLAYBACK Hardware ****
placa 0: Intel [HDA Intel], dispositivo 0: CX20551 Analog [CX20551 Analog]
  Dispositivo secundário: 0/1
  Dispositivo secundário #0: subdevice #0
placa 0: Intel [HDA Intel], dispositivo 1: CX20551 Digital [CX20551 Digital]
  Dispositivo secundário: 1/1
  Dispositivo secundário #0: subdevice #0

Espero que alguém possa me ajudar...