why X insist on using vesa driver?



Dear all,

I have two computers installed Debian sarge. One uses ATI readon 9000 and
the other uses nvidia. I uses dpkg-reconfigre xserver-xfree86 to configure
X, then I found in XF86Config-4 vesa is used:

Section "Device"
Identifier "Generic Video Card"
Driver "vesa"
Option "VBERestore" "true"
EndSection

Why?

Best regards,
Dai Yuwen