Lubuntu does not use all of my RAM

[dikdirk]

I am running Lubuntu 12.10 64bit on my hp nx7400 laptop.
I recently upgraded my RAM to 4GB (2x2GB memory modules), however sysinfo only displays 3.3GB of available RAM.

In the bios I can clearly see 4GB of ram installed and I can also run a diagnosis check on the memory in the bios. So it seems to be operating system related.

So, I am wondering what happened to the rest of it.

In this post: http://ubuntuforums.org/showthread.p...0#post12429300
it is suggested that it might have something to do with shared video memory, however it is not posted how to verify that.

Does someone know how to:

• check the amount shared video memory?
• change the amount of shared video memory?
• find out what else might be the cause?

[matt_symes]

HI

This question keeps coming up.

http://unix.stackexchange.com/questi...y-have-4-0-gib

Kind regards

[dikdirk]

HI

This question keeps coming up.

http://unix.stackexchange.com/questi...y-have-4-0-gib

Kind regards

Thank your for the response. Your link, however, seems to be related to 32 bit operating system and architecture. My operating system and architecture is 64 bit:

for example

• unem -a gives: Linux martin-HPnx7400 3.5.0-21-generic #32-Ubuntu SMP Tue Dec 11 18:51:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
• sudo lshw |grep cpu, gives: *-cpu
  bus info: cpu@0
  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 syscall nx x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dtherm tpr_shadow cpufreq

Accoring to wikipedia x86-64 means 64 bit and thus the cause should be something else!

[Cheesemill]

Is there a setting in your BIOS for allocating shared video memory? On my motherboard I can adjust how much RAM the onboard video adapter uses.

[dikdirk]

Is there a setting in your BIOS for allocating shared video memory? On my motherboard I can adjust how much RAM the onboard video adapter uses.

No, unfortunately not.

[fdrake]

did you try reinstallin the kernel after the RAM upgrade? RAM sometimes doesn't get configured automatically

sudo apt-get install linux-image && sudo apt-get update

[kernel2]

is there any way to use Lubuntu 13 64-bit memory of 8 GB?

[kernel2]

Well, come to detail, something I should have done from the beginning.


Motherboard asrock N68-S3-fx
2 memories 1X 4GB DDR3 1600.


Sata 160 gb HD.


In bios I provides the total memory 8 GB shared 256
with nvidia onboard.




Systems tested Lubuntu 13:04 64 and 32 bits.




The installation of both works only with 1 stick of memory connected.


And in Sees Maximum 3 GB, both 64-bit and 32.


When I add another comb memory, the boot screen is dark. Blank Screen.


In 32-bit system the only kernel that worked with 2 sticks Memory was the generic 3.2.40 for ubuntu.


But I only view 3 GB of memory.


I installed kernel-pae, gave me black screen again, Blank Screen, it stop there.


In the 64-bit, even compiling the kernel 3.2.40, still blank screen, the thing is when I put the other comb 4 GB, 8 GB total, is in blank Screen and not out there.


The I modified grub also for possible problems blank screen, changing the grub splash quiet to modonoset.


Only works with one memory of 4 GB, which displays only 3 Gb


The OS was installed via USB stick.
Yet this does not influence.


Anyone can say what I can do for my Lubuntu use 8 GB?

[oldos2er]

You'd be much better off starting a new thread for your questions.

[TenPlus1]

Gfx memory usage is setup in the bios which you would have to change each time, their is no automatic way of doing this...

So long as your system works ok even with 3.3gb of memory available hold on for some future updates either for Ubuntu itself through the kernel or your laptop bios and I'm sure one of these will fix the memory available for you...