Thread: Ubuntu 11.10 64 bit does not recognizes my 4G RAM (32bit+PAE does)

hi folks,

question may have been answered before, failed find answer because, if exists, it's buried in thousands of google results problem (people tring 32 bit non-pae systems map more ~3 gb ram).



have installed ubuntu 11.10 in dell inspiron n4050 laptop core i5 processor (sandy bridge, 2nd generation), system fails recognize 4gb of ram.

in 64 bit installation, free shows me:

code:

$ free              total       used       free     shared    buffers     cached mem:       3963304    2107852    1855452          0     110656    1245604 -/+ buffers/cache:     751592    3211712 swap:      5857276     150400    5706876

for pure experimentation/investigation, formatted system removing 64 bit edition , installed ubuntu 32 bits + pae enabled kernel; 4096 mb of memory correctly identified.

since have no plans of running 32 bit system in machine, removed 32 bit edition (formatting disk) , installed 64 bit edition again try solve problem. have got similar problem?



quick facts:

- system is running 64 bit ubuntu 11.10 now;
- use linux ten years , i'm not afraid of commands;
- memory is ok; passes memtest86, shown expected in 32 bit + pae edition;
- memory identified windows 7 came pre-installed in machine (now removed);
- system have intel hd graphics controller (afaik) should not reserve memory -- system have here, seems driver allocates memory on fly instead of reserving it;
- system updated;


also, follows uname , lspci

code:

$uname -a linux stark 3.0.0-16-generic #28-ubuntu smp fri jan 27 17:44:39 utc 2012 x86_64 x86_64 x86_64 gnu/linux  ~$ lspci 00:00.0 host bridge: intel corporation 2nd generation core processor family dram controller (rev 09) 00:02.0 vga compatible controller: intel corporation 2nd generation core processor family integrated graphics controller (rev 09) 00:16.0 communication controller: intel corporation 6 series/c200 series chipset family mei controller #1 (rev 04) 00:1a.0 usb controller: intel corporation 6 series/c200 series chipset family usb enhanced host controller #2 (rev 05) 00:1b.0 audio device: intel corporation 6 series/c200 series chipset family high definition audio controller (rev 05) 00:1c.0 pci bridge: intel corporation 6 series/c200 series chipset family pci express root port 1 (rev b5) 00:1c.1 pci bridge: intel corporation 6 series/c200 series chipset family pci express root port 2 (rev b5) 00:1c.3 pci bridge: intel corporation 6 series/c200 series chipset family pci express root port 4 (rev b5) 00:1c.7 pci bridge: intel corporation 6 series/c200 series chipset family pci express root port 8 (rev b5) 00:1d.0 usb controller: intel corporation 6 series/c200 series chipset family usb enhanced host controller #1 (rev 05) 00:1f.0 isa bridge: intel corporation hm67 express chipset family lpc controller (rev 05) 00:1f.2 sata controller: intel corporation 6 series/c200 series chipset family 6 port sata ahci controller (rev 05) 00:1f.3 smbus: intel corporation 6 series/c200 series chipset family smbus controller (rev 05) 05:00.0 ethernet controller: realtek semiconductor co., ltd. rtl8101e/rtl8102e pci express fast ethernet controller (rev 05) 09:00.0 network controller: atheros communications inc. ar9285 wireless network adapter (pci-express) (rev 01)

knows happening?

posted marko darko

hi folks,

question may have been answered before, failed find answer because, if exists, it's buried in thousands of google results problem (people tring 32 bit non-pae systems map more ~3 gb ram).



have installed ubuntu 11.10 in dell inspiron n4050 laptop core i5 processor (sandy bridge, 2nd generation), system fails recognize 4gb of ram.

in 64 bit installation, free shows me:

code:

$ free              total       used       free     shared    buffers     cached mem:       3963304    2107852    1855452          0     110656    1245604 -/+ buffers/cache:     751592    3211712 swap:      5857276     150400    5706876

...........

why you think virtually not full 4gb?

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