Perché non posso vedere i lettori cd/dvd?

giovanni@giovanni-P4S61:~$ lshw
WARNING: you should run this program as super-user.
giovanni-p4s61            
    description: Computer
    width: 32 bits
  *-core
       description: Motherboard
       physical id: 0
     *-memory
          description: System memory
          physical id: 0
          size: 1446MiB
     *-cpu:0
          product: Intel(R) Pentium(R) 4 CPU 3.00GHz
          vendor: Intel Corp.
          physical id: 1
          bus info: cpu@0
          version: 15.3.4
          serial: 0000-0F34-0000-0000-0000-0000
          size: 3GHz
          width: 32 bits
          capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs bts pni dtes64 monitor ds_cpl cid xtpr
          configuration: id=1
        *-logicalcpu:0
             description: Logical CPU
             physical id: 1.1
             width: 32 bits
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 1.2
             width: 32 bits
             capabilities: logical
     *-cpu:1
          product: Intel(R) Pentium(R) 4 CPU 3.00GHz
          vendor: Intel Corp.
          physical id: 2
          bus info: cpu@1
          version: 15.3.4
          serial: 0000-0F34-0000-0000-0000-0000
          size: 3GHz
          width: 32 bits
          capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs bts pni dtes64 monitor ds_cpl cid xtpr
          configuration: id=1
        *-logicalcpu:0
             description: Logical CPU
             physical id: 1.1
             width: 32 bits
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 1.2
             width: 32 bits
             capabilities: logical
     *-pci
          description: Host bridge
          product: 661FX/M661FX/M661MX Host
          vendor: Silicon Integrated Systems [SiS]
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 11
          width: 32 bits
          clock: 33MHz
          configuration: driver=agpgart-sis latency=32
          resources: irq:0 memory:e0000000-e3ffffff
        *-pci
             description: PCI bridge
             product: AGP Port (virtual PCI-to-PCI bridge)
             vendor: Silicon Integrated Systems [SiS]
             physical id: 1
             bus info: pci@0000:00:01.0
             version: 00
             width: 32 bits
             clock: 66MHz
             capabilities: pci normal_decode bus_master
             resources: ioport:a000(size=4096) memory:cfd00000-cfefffff memory:bfa00000-cfbfffff
           *-display UNCLAIMED
                description: VGA compatible controller
                product: 661/741/760 PCI/AGP or 662/761Gx PCIE VGA Display Adapter
                vendor: Silicon Integrated Systems [SiS]
                physical id: 0
                bus info: pci@0000:01:00.0
                version: 00
                width: 32 bits
                clock: 66MHz
                capabilities: vga_controller cap_list
                configuration: latency=0
                resources: memory:c0000000-c7ffffff memory:cfee0000-cfefffff ioport:ac00(size=128)
        *-isa
             description: ISA bridge
             product: SiS963 [MuTIOL Media IO] LPC Controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 25
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master
             configuration: latency=0
        *-serial UNCLAIMED
             description: SMBus
             product: SiS961/2/3 SMBus controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 2.1
             bus info: pci@0000:00:02.1
             version: 00
             width: 32 bits
             clock: 33MHz
             configuration: latency=0
             resources: ioport:c00(size=32)
        *-ide
             description: IDE interface
             product: 5513 IDE Controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 2.5
             bus info: pci@0000:00:02.5
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: ide bus_master
             configuration: driver=pata_sis latency=128
             resources: irq:0 ioport:1f0(size=8) ioport:3f6 ioport:170(size=8) ioport:376 ioport:ff00(size=16)
        *-multimedia
             description: Multimedia audio controller
             product: SiS7012 AC'97 Sound Controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 2.7
             bus info: pci@0000:00:02.7
             version: a0
             width: 32 bits
             clock: 33MHz
             capabilities: bus_master cap_list
             configuration: driver=snd_intel8x0 latency=32 maxlatency=11 mingnt=52
             resources: irq:18 ioport:dc00(size=256) ioport:d800(size=128)
        *-usb:0
             description: USB controller
             product: USB 1.1 Controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 3
             bus info: pci@0000:00:03.0
             version: 0f
             width: 32 bits
             clock: 33MHz
             capabilities: ohci bus_master
             configuration: driver=ohci_hcd latency=32 maxlatency=80
             resources: irq:20 memory:cfff9000-cfff9fff
        *-usb:1
             description: USB controller
             product: USB 1.1 Controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 3.1
             bus info: pci@0000:00:03.1
             version: 0f
             width: 32 bits
             clock: 33MHz
             capabilities: ohci bus_master
             configuration: driver=ohci_hcd latency=32 maxlatency=80
             resources: irq:21 memory:cfffa000-cfffafff
        *-usb:2
             description: USB controller
             product: USB 2.0 Controller
             vendor: Silicon Integrated Systems [SiS]
             physical id: 3.2
             bus info: pci@0000:00:03.2
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: ehci bus_master cap_list
             configuration: driver=ehci-pci latency=32 maxlatency=80
             resources: irq:23 memory:cfffb000-cfffbfff
        *-network
             description: Ethernet interface
             product: SiS900 PCI Fast Ethernet
             vendor: Silicon Integrated Systems [SiS]
             physical id: 4
             bus info: pci@0000:00:04.0
             logical name: eth0
             version: 90
             serial: 00:0b:6a:8e:bc:7f
             size: 100Mbit/s
             capacity: 100Mbit/s
             width: 32 bits
             clock: 33MHz
             capabilities: bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
             configuration: autonegotiation=on broadcast=yes driver=sis900 driverversion=v1.08.10 Apr. 2 2006 duplex=full ip=192.168.1.2 latency=32 link=yes maxlatency=11 mingnt=52 multicast=yes port=MII speed=100Mbit/s
             resources: irq:19 ioport:d400(size=256) memory:cfff8000-cfff8fff memory:5c000000-5c01ffff
        *-communication UNCLAIMED
             description: Modem
             product: SM56 Data Fax Modem
             vendor: Motorola
             physical id: 9
             bus info: pci@0000:00:09.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: generic cap_list
             configuration: latency=32 maxlatency=62 mingnt=1
             resources: memory:cfff7000-cfff7fff ioport:d000(size=256)
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.