[ubuntu-za] [GLUG-tech] 4gb RAM lucid 64 reboot loop issue

William Walter Kinghorn williamk at dut.ac.za
Wed May 26 14:22:05 BST 2010

Hi All,

You need to install Physical Address Extension (PAE) aware kernel under 32 bit Ubuntu Linux

64 bit Linux kernel will take care of 4G or more memory. Just grab latest 64 bit version and install it.

look at http://www.cyberciti.biz/faq/ubuntu-linux-4gb-ram-limitation-solution/

although it is for 8.10, I think it is still valid

From: ubuntu-za-bounces at lists.ubuntu.com [ubuntu-za-bounces at lists.ubuntu.com] On Behalf Of Hannes Coetzee [scorpking at scorpking.za.org]
Sent: 26 May 2010 15:05
To: Ubuntu South African Local Community
Subject: Re: [ubuntu-za] [GLUG-tech] 4gb RAM lucid 64 reboot loop issue

> Right, acpi=off is not an option. CPU scaling is turned off, so the
> CPU runs very hot, CPU fan hits max speed, so battery life is shot to
> heck, and pressing the power button just makes the laptop go dead
> instantly.
Check your BOIS settings for the power switch issue. It could be set to
"Instant Off" or something similar.
> Running with mem=4000m and Ubuntu says it has 2.9gb available :(
> that'l have to do for now...
As far as I know you will have to fiddle with the kernel to get more
than 3GB RAM picked up by Ubuntu (Google knows).

For the rest of the problems I'd start looking in the BIOS. I've noticed
some weird behavior before with Linux if the BIOS settings are not correct.


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