On 04/30/2012 07:31 AM, Ralf Mardorf wrote:
On Sun, 2012-04-29 at 22:35 +0200, Kaj Ailomaa wrote:
On 04/29/2012 04:00 PM, Ralf Mardorf wrote:
I still wonder what to do, to get access to the
4GB RAM, instead of just 3.8GB, since arch is 64-bit.

Which kernel are you using?

spinymouse@precise:~$ uname -a
Linux precise 3.2.0-23-lowlatency #31-Ubuntu SMP PREEMPT Wed Apr 11
02:24:03 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

I noticed that for another 64bit Linux on my machine too, while a 32bit
Linux with a PAE is ok. I searched the Internet and found out that
several people on different Linux have the same problem.

- Ralf



And you are not using a builtin graphic card which uses a part of your RAM?
Is this a problem with other kernels as well?
You could try installing one of these to double check http://kernel.ubuntu.com/~kernel-ppa/mainline/

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