[Bug 141439] Re: Laptop nc8430, 4GB Ram and fglrx

[Jörn Dreyer]

> May I ask how did you verify that the destop kernels have HIGHMEM4G set?
/boot should contain all configs for the kernels installed on your system:
$ grep _HIGHMEM /boot/config-2.6.22-14-generic 
# CONFIG_DEBUG_HIGHMEM is not set
CONFIG_HIGHMEM=y
CONFIG_HIGHMEM4G=y
# CONFIG_HIGHMEM64G is not set

> does setting HIGHMEM4G mean that they I _should_ be able to see 4G (/proc/meminfo) when not using fglrx?
this one is more complicated.
short answer: it depends on your cpu, mainboard, bios, os and PAE support - on 32bit laptops most likely not.
long answer: http://blogs.msdn.com/dcook/archive/2007/03/25/who-ate-my-memory.aspx

concerning this bug: I somewhere read it had to do with MTRRs. However,
my problem is ... deferred as I will simply use 3GP of physical memory
... my mainboard or bios does not seem to support PAE.

-- 
Laptop nc8430, 4GB Ram and fglrx
https://bugs.launchpad.net/bugs/141439
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