My Compaq Presario R4146EA seems to have similar problem, here I show
you my terminal (my Jaunty is in Spanish, sorry), I'm redirected from
this post https://answers.launchpad.net/ubuntu/+source/gnome-
media/+question/72058

(I'm newbie in Ubuntu, so I'm sorry by my mistakes reporting this
problem):

$ sudo dmidecode
# dmidecode 2.9
SMBIOS 2.31 present.
34 structures occupying 1093 bytes.
Table at 0x000DF810.

Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
        Vendor: Hewlett-Packard
        Version: F.1A
        Release Date: 09/03/2005
        Address: 0xE6680
        Runtime Size: 104832 bytes
        ROM Size: 512 kB
        Characteristics:
                PCI is supported
                PC Card (PCMCIA) is supported
                PNP is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                Boot from CD is supported
                Selectable boot is supported
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Printer services are supported (int 17h)
                CGA/mono video services are supported (int 10h)
                ACPI is supported
                USB legacy is supported
                AGP is supported
                LS-120 boot is supported
                Smart battery is supported

Handle 0x0001, DMI type 1, 25 bytes
System Information
        Manufacturer: Hewlett-Packard
        Product Name: Presario R4100 (EF001EA#ABE)      
        Version: F.1A
        Serial Number: CND5380TZC
        UUID: 0D289A07-2703-11DA-B501-000FB078976D
        Wake-up Type: Power Switch

Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
        Manufacturer: Hewlett-Packard 
        Product Name: 3085
        Version: 42.3A
        Serial Number: CND5380TZC

Handle 0x0003, DMI type 3, 21 bytes
Chassis Information
        Manufacturer: Hewlett-Packard 
        Type: Notebook
        Lock: Not Present
        Version: N/A
        Serial Number: None
        Asset Tag:                     
        Boot-up State: Safe
        Power Supply State: Safe
        Thermal State: Safe
        Security Status: None
        OEM Information: 0x00000000
        Height: 52 U
        Number Of Power Cords: 18
        Contained Elements: 0

Handle 0x0004, DMI type 4, 35 bytes
Processor Information
        Socket Designation: U23
        Type: Central Processor
        Family: Athlon 64
        Manufacturer: AuthenticAMD
        ID: F2 0F 02 00 FF FB 8B 07
        Signature: Family 15, Model 47, Stepping 2
        Flags:
                FPU (Floating-point unit on-chip)
                VME (Virtual mode extension)
                DE (Debugging extension)
                PSE (Page size extension)
                TSC (Time stamp counter)
                MSR (Model specific registers)
                PAE (Physical address extension)
                MCE (Machine check exception)
                CX8 (CMPXCHG8 instruction supported)
                APIC (On-chip APIC hardware supported)
                SEP (Fast system call)
                MTRR (Memory type range registers)
                PGE (Page global enable)
                MCA (Machine check architecture)
                CMOV (Conditional move instruction supported)
                PAT (Page attribute table)
                PSE-36 (36-bit page size extension)
                CLFSH (CLFLUSH instruction supported)
                MMX (MMX technology supported)
                FXSR (Fast floating-point save and restore)
                SSE (Streaming SIMD extensions)
                SSE2 (Streaming SIMD extensions 2)
        Version: AMD Athlon(tm) 64 
        Voltage: 2.2 V
        External Clock: Unknown
        Max Speed: 2000 MHz
        Current Speed: 2000 MHz
        Status: Populated, Enabled
        Upgrade: ZIF Socket
        L1 Cache Handle: Not Provided
        L2 Cache Handle: 0x0005
        L3 Cache Handle: Not Provided
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified

Handle 0x0005, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L2 Cache
        Configuration: Enabled, Socketed, Level 2
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 512 KB
        Maximum Size: 1024 KB
        Supported SRAM Types:
                Burst
                Pipeline Burst
        Installed SRAM Type: Synchronous
        Speed: Unknown
        Error Correction Type: Unknown
        System Type: Unknown
        Associativity: Unknown

Handle 0x0006, DMI type 9, 13 bytes
System Slot Information
        Designation: PCI Slot J1100
        Type: 32-bit PCI
        Current Usage: In Use
        Length: Long
        ID: 0
        Characteristics:
                5.0 V is provided
                3.3 V is provided
                PME signal is supported

Handle 0x0007, DMI type 9, 13 bytes
System Slot Information
        Designation: PCI Slot J1101
        Type: 32-bit PCI
        Current Usage: In Use
        Length: Long
        ID: 0
        Characteristics:
                5.0 V is provided
                3.3 V is provided
                PME signal is supported

Handle 0x0008, DMI type 10, 6 bytes
On Board Device Information
        Type: Video
        Status: Enabled
        Description: SidePort    ...

Handle 0x000A, DMI type 12, 5 bytes
System Configuration Options
        Option 1: Jumper settings can be described here.

Handle 0x000B, DMI type 15, 29 bytes
System Event Log
        Area Length: 16 bytes
        Header Start Offset: 0x0000
        Header Length: 16 bytes
        Data Start Offset: 0x0010
        Access Method: General-purpose non-volatile data functions
        Access Address: 0x0000
        Status: Valid, Not Full
        Change Token: 0x00000000
        Header Format: Type 1
        Supported Log Type Descriptors: 3
        Descriptor 1: POST error
        Data Format 1: POST results bitmap
        Descriptor 2: Single-bit ECC memory error
        Data Format 2: Multiple-event
        Descriptor 3: Multi-bit ECC memory error
        Data Format 3: Multiple-event

Handle 0x000C, DMI type 16, 15 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: <OUT OF SPEC>
        Maximum Capacity: 8 GB
        Error Information Handle: Not Provided
        Number Of Devices: 2

Handle 0x000D, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x000C
        Error Information Handle: No Error
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 512 MB
        Form Factor: DIMM
        Set: 1
        Locator: JP11
        Bank Locator: Bank 0
        Type: DRAM
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: Not Specified
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified

Handle 0x000E, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x000C
        Error Information Handle: No Error
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 512 MB
        Form Factor: DIMM
        Set: 2
        Locator: JP30
        Bank Locator: Bank 1
        Type: DRAM
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: Not Specified
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified

Handle 0x000F, DMI type 18, 23 bytes
32-bit Memory Error Information
        Type: OK
        Granularity: Unknown
        Operation: Unknown
        Vendor Syndrome: Unknown
        Memory Array Address: Unknown
        Device Address: Unknown
        Resolution: Unknown

Handle 0x0010, DMI type 19, 15 bytes
Memory Array Mapped Address
        Starting Address: 0x00000000000
        Ending Address: 0x0003FFFFFFF
        Range Size: 1 GB
        Physical Array Handle: 0x000C
        Partition Width: 0

Handle 0x0011, DMI type 20, 19 bytes
Memory Device Mapped Address
        Starting Address: 0x00000000000
        Ending Address: 0x0001FFFFFFF
        Range Size: 512 MB
        Physical Device Handle: 0x000D
        Memory Array Mapped Address Handle: 0x0010
        Partition Row Position: 2
        Interleave Position: 1
        Interleaved Data Depth: 6

Handle 0x0012, DMI type 22, 26 bytes
Portable Battery
        Location: Left Front
        Manufacturer: Not Specified
        Name: <BAD INDEX>
        Design Capacity: Unknown
        Design Voltage: Unknown
        SBDS Version: Not Specified
        Maximum Error: Unknown
        SBDS Serial Number: 0000
        SBDS Manufacture Date: 1980-00-00
        SBDS Chemistry: Not Specified
        OEM-specific Information: 0x00000000

Handle 0x0013, DMI type 23, 13 bytes
System Reset
        Status: Enabled
        Watchdog Timer: Present
        Boot Option: Do Not Reboot
        Boot Option On Limit: Do Not Reboot
        Reset Count: Unknown
        Reset Limit: Unknown
        Timer Interval: Unknown
        Timeout: Unknown

Handle 0x0014, DMI type 24, 5 bytes
Hardware Security
        Power-On Password Status: Disabled
        Keyboard Password Status: Unknown
        Administrator Password Status: Enabled
        Front Panel Reset Status: Unknown

Handle 0x0015, DMI type 25, 9 bytes
        System Power Controls
        Next Scheduled Power-on: 12-31 23:59:59

Handle 0x0016, DMI type 26, 22 bytes
Voltage Probe
        Description: Voltage Probe 1
        Location: Processor
        Status: OK
        Maximum Value: Unknown
        Minimum Value: Unknown
        Resolution: Unknown
        Tolerance: Unknown
        Accuracy: Unknown
        OEM-specific Information: 0x00000000
        Nominal Value: 8.192 V

Handle 0x0017, DMI type 26, 20 bytes
Voltage Probe
        Description: Voltage Probe 2
        Location: Processor
        Status: OK
        Maximum Value: Unknown
        Minimum Value: Unknown
        Resolution: Unknown
        Tolerance: Unknown
        Accuracy: Unknown
        OEM-specific Information: 0x00000000

Handle 0x0018, DMI type 27, 14 bytes
Cooling Device
        Temperature Probe Handle: 0x001A
        Type: Fan
        Status: OK
        Cooling Unit Group: 255
        OEM-specific Information: 0x00000000
        Nominal Speed: Unknown Or Non-rotating

Handle 0x0019, DMI type 27, 12 bytes
Cooling Device
        Temperature Probe Handle: 0x001A
        Type: Fan
        Status: OK
        Cooling Unit Group: 255
        OEM-specific Information: 0x00000000

Handle 0x001A, DMI type 28, 22 bytes
Temperature Probe
        Description: Temperature Probe 1
        Location: Processor
        Status: OK
        Maximum Value: Unknown
        Minimum Value Unknown
        Resolution: Unknown
        Tolerance: Unknown
        Accuracy: Unknown
        OEM-specific Information: 0x00000000
        Nominal Value: Unknown

Handle 0x001B, DMI type 28, 20 bytes
Temperature Probe
        Description: Temperature Probe 2
        Location: Processor
        Status: OK
        Maximum Value: Unknown
        Minimum Value Unknown
        Resolution: Unknown
        Tolerance: Unknown
        Accuracy: Unknown
        OEM-specific Information: 0x00000000

Handle 0x001C, DMI type 29, 22 bytes
Electrical Current Probe
        Description: Electrical Current Probe 1
        Location: Processor
        Status: OK
        Maximum Value: Unknown
        Minimum Value: Unknown
        Resolution: Unknown
        Tolerance: Unknown
        Accuracy: Unknown
        OEM-specific Information: 0x00000000
        Nominal Value: Unknown

Handle 0x001D, DMI type 29, 20 bytes
Electrical Current Probe
        Description: Electrical Current Probe 2
        Location: Processor
        Status: OK
        Maximum Value: Unknown
        Minimum Value: Unknown
        Resolution: Unknown
        Tolerance: Unknown
        Accuracy: Unknown
        OEM-specific Information: 0x00000000

Handle 0x001E, DMI type 30, 6 bytes
Out-of-band Remote Access
        Manufacturer Name: Intel
        Inbound Connection: Enabled
        Outbound Connection: Disabled

Handle 0x001F, DMI type 32, 20 bytes
System Boot Information
        Status: <OUT OF SPEC>

Handle 0x0020, DMI type 126, 4 bytes
Inactive

Handle 0x0021, DMI type 127, 4 bytes
End Of Table

Wrong DMI structures count: 34 announced, only 33 decoded.

(Showkey for mute key):

~$ sudo showkey -s
el modo kb era RAW
[ si lo está intentando bajo las X, podría no funcionar
ya que el servidor X también está leyendo /dev/console ]

pulse cualquier tecla (el programa termina 10s después de la última pulsación 
de tecla)...
0x9c 
0xe0 0x2e 
0xe0 0x20 0xe0 0xa0 

(Volume up pressed):

~$ sudo showkey -s
el modo kb era RAW
[ si lo está intentando bajo las X, podría no funcionar
ya que el servidor X también está leyendo /dev/console ]

pulse cualquier tecla (el programa termina 10s después de la última pulsación 
de tecla)...
0x9c 
0xe0 0x30 

(Here I press volume down key):

~$ sudo showkey -s
el modo kb era RAW
[ si lo está intentando bajo las X, podría no funcionar
ya que el servidor X también está leyendo /dev/console ]

pulse cualquier tecla (el programa termina 10s después de la última pulsación 
de tecla)...
0x9c 
0xe0 0x2e

-- 
Problematic volume control keys and mute key of several notebooks + Patch
https://bugs.launchpad.net/bugs/330259
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