I have exactly the same issue on 32 bit Ubuntu Intrepid Ibex 8.10.
My Samsung R60 - XY01 has Intel Core 2 Duo T5250 and BIOS detects full 4Gb.
I tried compiling kernel with PAE support (4GB and 64GB turned on) from 2.6.27
source.
Now i'm running 2.6.27-7-server, was running 2.6.27-7-generic.
free:
total used free shared buffers
cached
Mem: 2850784 2764372 86412 0 89668 855304
Still 4GB are detected as 2.7Gb.
Here is dmidecode part (don't know if it says something):
..............................
Handle 0x000A, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 1 GB
Error Information Handle: Not Provided
Number Of Devices: 2
Handle 0x000B, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x000A
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: 2048 MB
Form Factor: DIMM
Set: 1
Locator: J400
Bank Locator: Channel A0
Type: DRAM
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Handle 0x000C, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x000A
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: 2048 MB
Form Factor: DIMM
Set: 3
Locator: J501
Bank Locator: Channel B0
Type: DRAM
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Handle 0x000D, DMI type 18, 23 bytes
32-bit Memory Error Information
Type: OK
Granularity: Unknown
Operation: Unknown
Vendor Syndrome: Unknown
Memory Array Address: Unknown
Device Address: Unknown
Resolution: Unknown
Handle 0x000E, DMI type 19, 15 bytes
Memory Array Mapped Address
Starting Address: 0x00000000000
Ending Address: 0x000FFFFFFFF
Range Size: 4 GB
Physical Array Handle: 0x000A
Partition Width: 0
Handle 0x000F, DMI type 20, 19 bytes
Memory Device Mapped Address
Starting Address: 0x00000000000
Ending Address: 0x0007FFFFFFF
Range Size: 2 GB
Physical Device Handle: 0x000B
Memory Array Mapped Address Handle: 0x000E
Partition Row Position: 2
Interleave Position: 1
Interleaved Data Depth: 6
.....................................
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2.6.27-7-generic not detecting 4GB RAM
https://bugs.launchpad.net/bugs/287031
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