Con alsamixer ocurrió esto:
"alsamixer: function snd_ctl_open failed for default: No such file or directory"



...proba antes, en una terminal, el comando "alsamixer" y subi todos
los volúmes. Quizás sea eso, sino manda el lspci que vemos qué opción
pasarle al demonio de alsa ;)


Hola Hernan, la tienes instalada en la pc no? si es asi, entra en un
terminal y ejecuta lspci, y mandanos lo que te sale.
saludos

Está instalada en la pc.

Con lspci me respondió así:
"
herman@musix-hp:~$ lspci
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge
00:02.0 PCI bridge: ATI Technologies Inc RS480 PCI-X Root Port
00:11.0 IDE interface: ATI Technologies Inc IXP SB400 Serial ATA Controller
00:12.0 IDE interface: ATI Technologies Inc IXP SB400 Serial ATA Controller
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 04)
00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]
01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
02:00.0 Multimedia audio controller: Creative Labs SB X-Fi
02:01.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)
02:02.0 Multimedia controller: Philips Semiconductors SAA7134/SAA7135HL Video Broadcast Decoder (rev 01)
02:03.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
02:04.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306 Fire II IEEE 1394 OHCI Link Layer Controller (rev 80)
"
(por razones de laburo no volveré hasta el fin de semana)
Desde ya muchas gracias!!
Herman