I have a "256mb" mobility X1400; I understand HyperMemory means that there is only 128 mb on the card and it takes the rest from the system's RAM.
The only thing is -- I like this! Do the fglrx drivers allow for this feature? Right now I'm getting applications telling me I have 128 mb of video RAM, and
cameron@vienna:~$ less /var/log/Xorg.0.log | grep RAM
(--) fglrx(0): VideoRAM: 131072 kByte, Type: DDR2
Confirms it. Any thoughts?
You can try if setting the AGP aperture size to 256 M helps but i'm not really sure that it does...