This is actually a repost of a problem that received few serious replies 
(IMNSHO).

Basically 2.4.0 detects 192 MB(maybe 191, but big whoop) of memory. This 
is correct. However, 2.4.1-ac6 (as did Linus-blessed 2.4.1) detects 64. 
The problem is simple. 2.4.1 and later for some reason uses bios-88, 
instead of e820.

Attached are the dmesgs from 2.4.0 and 2.4.1-ac6.