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Thread: Ubuntu 64bit doesn't recognise all RAM

  1. #11
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Quote Originally Posted by greenfrog View Post
    The bios is what tells the operating system how much ram is available.

    How much ram does your bios show?
    The OP already answered that
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  2. #12
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    Re: Ubuntu 64bit doesn't recognise all RAM

    That is exactly what I thought.

    The BIOS says I have 8192MB of RAM.

  3. #13
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Quote Originally Posted by JamesStewy View Post
    That is exactly what I thought.

    The BIOS says I have 8192MB of RAM.
    post output of
    Code:
    sudo dmidecode -t 17
    also

    Code:
    uname -m
    to check you are running x64
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  4. #14
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Hi, thanks for your reply.

    Code:
    sudo dmidecode -t 17
    Outputs:

    Code:
    # dmidecode 2.11
    SMBIOS 2.5 present.
    
    Handle 0x0082, DMI type 17, 27 bytes
    Memory Device
            Array Handle: 0x0081
            Error Information Handle: Not Provided
            Total Width: 64 bits
            Data Width: 64 bits
            Size: 4096 MB
            Form Factor: SODIMM
            Set: Unknown
            Locator: DIMM 0
            Bank Locator: CSA 0 & 1
            Type: DDR2
            Type Detail: Synchronous
            Speed: 800 MHz
            Manufacturer: 7F7F
            Serial Number: 00000000
            Asset Tag: Not Specified
            Part Number:   K6451U64E6800F
    
    Handle 0x0083, DMI type 17, 27 bytes
    Memory Device
            Array Handle: 0x0081
            Error Information Handle: Not Provided
            Total Width: 64 bits
            Data Width: 64 bits
            Size: 4096 MB
            Form Factor: SODIMM
            Set: Unknown
            Locator: DIMM 1
            Bank Locator: CSA 2 & 3
            Type: DDR2
            Type Detail: Synchronous
            Speed: 800 MHz
            Manufacturer: 7F7F
            Serial Number: 00000000
            Asset Tag: Not Specified
            Part Number:   K6451U64E6800F
    and

    Code:
    uname -m
    Outputs:

    Code:
    x86_64

  5. #15
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Quote Originally Posted by JamesStewy View Post
    Hi, thanks for your reply.

    Code:
    sudo dmidecode -t 17
    Outputs:

    Code:
    # dmidecode 2.11
    SMBIOS 2.5 present.
    
    Handle 0x0082, DMI type 17, 27 bytes
    Memory Device
            Array Handle: 0x0081
            Error Information Handle: Not Provided
            Total Width: 64 bits
            Data Width: 64 bits
            Size: 4096 MB
            Form Factor: SODIMM
            Set: Unknown
            Locator: DIMM 0
            Bank Locator: CSA 0 & 1
            Type: DDR2
            Type Detail: Synchronous
            Speed: 800 MHz
            Manufacturer: 7F7F
            Serial Number: 00000000
            Asset Tag: Not Specified
            Part Number:   K6451U64E6800F
    
    Handle 0x0083, DMI type 17, 27 bytes
    Memory Device
            Array Handle: 0x0081
            Error Information Handle: Not Provided
            Total Width: 64 bits
            Data Width: 64 bits
            Size: 4096 MB
            Form Factor: SODIMM
            Set: Unknown
            Locator: DIMM 1
            Bank Locator: CSA 2 & 3
            Type: DDR2
            Type Detail: Synchronous
            Speed: 800 MHz
            Manufacturer: 7F7F
            Serial Number: 00000000
            Asset Tag: Not Specified
            Part Number:   K6451U64E6800F
    and

    Code:
    uname -m
    Outputs:

    Code:
    x86_64

    OK all looks good, where in Ubuntu is it reporting only 4gb ?

    post output of

    Code:
    free
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  6. #16
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    Re: Ubuntu 64bit doesn't recognise all RAM

    All the commands I found on the internet to find the amount of RAM say around 4gb including free

    Output:

    Code:
                 total       used       free     shared    buffers     cached
    Mem:       3846480    1858660    1987820          0      68288    1183964
    -/+ buffers/cache:     606408    3240072
    Swap:      4882428          0    4882428

  7. #17
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Quote Originally Posted by JamesStewy View Post
    All the commands I found on the internet to find the amount of RAM say around 4gb including free

    Output:

    Code:
                 total       used       free     shared    buffers     cached
    Mem:       3846480    1858660    1987820          0      68288    1183964
    -/+ buffers/cache:     606408    3240072
    Swap:      4882428          0    4882428
    mmmmm ok.

    I know this sounds bizarre, but remove the original DIMM to see if it sees the second on its own, also place the second in the original bank, you get the gist, process of elimination byt swapping DIMM configuration around in banks etc , though dmidecode is reporting fine.
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  8. #18
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Ok Thanks. Will try tomorrow.

  9. #19
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    Re: Ubuntu 64bit doesn't recognise all RAM

    I know this sounds bizarre, but remove the original DIMM to see if it sees the second on its own, also place the second in the original bank, you get the gist, process of elimination byt swapping DIMM configuration around in banks etc , though dmidecode is reporting fine.
    Upon re-reading my original post I fear I haven't explained my self well. I actually bought a brand new 2x4gb Kit and replaced the stock 2x2gb kit.

    And, as recommended in the first reply on this thread, I tried every possible permutation of my two new sticks of RAM including one at a time. The result of all the tests were the BIOS reported the correct amount of RAM (4gb or 8gb depending if I had 1 or 2 sticks in at the time), Ubuntu always reported i had 4gb of RAM and memtest86+ worked up until the start of test #7 were i started getting millions of errors.

    The only potential reason I can think of at the moment is the integrated graphics isn't configured correctly and Ubuntu isn't realizing. This could be a potential issue as this is my old school laptop and I have no idea what the school may have done prior to me receiving it. This wouldb't have any thing to do with the operating system though as I have wiped the hard disk completely to remove windows and replace it with Ubuntu.

    Is this possible?

    JamesStewy

  10. #20
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    Re: Ubuntu 64bit doesn't recognise all RAM

    Quote Originally Posted by JamesStewy View Post
    Upon re-reading my original post I fear I haven't explained my self well. I actually bought a brand new 2x4gb Kit and replaced the stock 2x2gb kit.

    And, as recommended in the first reply on this thread, I tried every possible permutation of my two new sticks of RAM including one at a time. The result of all the tests were the BIOS reported the correct amount of RAM (4gb or 8gb depending if I had 1 or 2 sticks in at the time), Ubuntu always reported i had 4gb of RAM and memtest86+ worked up until the start of test #7 were i started getting millions of errors.

    The only potential reason I can think of at the moment is the integrated graphics isn't configured correctly and Ubuntu isn't realizing. This could be a potential issue as this is my old school laptop and I have no idea what the school may have done prior to me receiving it. This wouldb't have any thing to do with the operating system though as I have wiped the hard disk completely to remove windows and replace it with Ubuntu.

    Is this possible?

    JamesStewy
    You have really tried to do the right things, and yet no luck.

    Just a quick check. Is this link describing your computer?
    http://uk.computers.toshiba-europe.com/innovation/jsp/SUPPORTSECTION/discontinuedProductPage.do?service=UK&toshibaShop= true&com.broadvision.session.new=Yes&PRODUCT_ID=10 58973
    In that case it should manage with 8 GB RAM. Furthermore it states DDR2 RAM (800 MHz).

    Check with the following command, that your memory sticks have the correct specs.
    Code:
    sudo lshw -class memory
    I suggest that you check also with the original memory sticks, if lshw will display the same or some other ratings, for example clock speed (800 MHz in Toshiba's specs).
    --
    Toshiba writes the following in the specs

    Graphics adaptor type : Mobile Intel® GMA 4500MHD
    memory : up to 1,340 MB total available graphics memory with 4 GB system memory
    memory type : shared

    and we may ask: what happens with more than 4 GB of memory?

    I wouldn't blame the graphics card or graphics driver yet, but who knows for sure.

    Try when booted from an Ubuntu install CD/DVD/USB drive without any proprietary driver installed!

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