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Thread: Ubuntu 12.10 use only partial memory

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  1. #1
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    Sep 2006
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    Ubuntu 12.10 use only partial memory

    Hi everyone,
    I installed Ubuntu 12.10 Gnome Remix on my new laptop but I've a problem with memory.
    My laptop has 4 GB memory but Ubuntu recognize only 2,4 GB.
    Obviously both BIOS and Windows 8 recognize all 4GB.

    My laptop configuration:
    Lenovo B590
    CPU: Intel Core i5-3210M
    Ram: 4 GB DDR3-SDRAM
    Chipset motherboard: Intel HM77 Express
    Integrated graphics: HD Graphics 4000.
    Operating System: Ubuntu 12.10
    Kernel: Linux 3.5.0-17-generic (x86_64)


    Some useful command outputs:
    Code:
    dmidecode --type memory
    
    	Array Handle: 0x000B
    	Error Information Handle: Not Provided
    	Total Width: 64 bits
    	Data Width: 64 bits
    	Size: 4096 MB
    	Form Factor: SODIMM
    	Set: None
    	Locator: ChannelB-DIMM0
    	Bank Locator: BANK 2
    	Type: DDR3
    	Type Detail: Synchronous
    	Speed: 1600 MHz
    	Manufacturer: Hynix/Hyundai
    	Serial Number: 1A21B5B9
    	Asset Tag: 9876543210
    	Part Number: HMT351S6EFR8C-PB  
    	Rank: Unknown
    	Configured Clock Speed: 1600 MHz

    Code:
    free -m
    
                       total       used       free     shared    buffers     cached
    Mem:          2483       1136       1346          0         56        515
    -/+ buffers/cache:        563       1919
    Swap:         4884          0       4884

    Code:
    cat /proc/meminfo | grep "Mem*"
    
    MemTotal:        2542664 kB
    MemFree:         1373552 kB
    Also running live version of Ubuntu the memory is always only 2,4GB.

    Can someone help me?
    Thanks a lot.

  2. #2
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    Re: Ubuntu 12.10 use only partial memory

    it may be possible that the lost memory is borrowed from Intel HD Graphics?
    if it's true, it always borrows fixed maximum memory?!

  3. #3
    Join Date
    Sep 2008
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    Re: Ubuntu 12.10 use only partial memory

    You're fine, stop worrying. I have 4 GB of RAM in my notebook, and have never once seen RAM usage go above 1 GB. I'm not sure if you have the System Monitor applet installed, but if you do, this command in the terminal will bring it up:

    gnome-system-monitor
    Assuming you have the applet, you'll see that you RAM usage is probably ~ 500 MB or less. You simply don't need 4 GB of memory for any Ubuntu application I'm aware of.

    Regarding the missing 2 GB, I would guess that your Intel integrated graphics are using it, though I could be wrong. But it remains irrelevant, 2 GB of usable RAM is more than enough.

  4. #4
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    Re: Ubuntu 12.10 use only partial memory

    Thanks for the answer.
    I know that 2,4 gb for standard use is enought, but for example if I'd like virtualize another system I need more memory.
    So the problem exist and I can't ignore it :S

  5. #5
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    Re: Ubuntu 12.10 use only partial memory

    A little googling reveals to me that HD 4000 graphics can use a maximum of 1.7 GB of system RAM for onboard video. Have you tried going into your system bios and looking for a setting to change the amount of RAM your onboard video uses? Most decent bioses have that option.

    I honestly don't see a problem here though. If you go into System Monitor and see that all 2.4 GB of RAM is being used, take a screenshot and show us. But until that happens, there is absolutely no problem here. Besides, if it bothers you that much, just add some RAM, but I can almost guarantee you will never use it except maybe in Windows.

  6. #6
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    Sep 2006
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    Re: Ubuntu 12.10 use only partial memory

    The problem disappeared with new kernel 3.8.0-19-generic.
    The system recognize 3,7GB of Memory now.
    Thanks to everyone.

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