X and Fluxbox :: Xvesa not working on 6600GT

Hi everybody. Just started trying out DSL and I like it a lot. My main system with an EVGA 6600GT is having some trouble with Xvesa. When I boot up it defaults to Xvesa and gets a blank screen. I hit Alt-F1 and it gets me a command prompt. If I run xsetup.sh and choose Xfbdev, it works fine, but scrolling and drawing windows is painfully slow. Xvesa stops with the error "Interrupt point doesn't point at ROM." I did some searching and found the -listmodes switch. Here's what it says:

dsl@box:~$ Xvesa -listmodes
Interrupt pointer doesn't point at ROM
Interrupt pointer doesn't point at ROM
0x0006: 640x200x1 (monochrome) Planar (1 planes)
0x000D: 320x200x4 Planar (4 planes) (no linear framebuffer)
0x000E: 640x200x4 Planar (4 planes) (no linear framebuffer)
0x0010: 640x350x4 Planar (4 planes) (no linear framebuffer)
0x0011: 640x480x1 (monochrome) Planar (1 planes)
0x0012: 640x480x4 Planar (4 planes) (no linear framebuffer)
0x0013: 320x200x8 PseudoColor

It looks like something wrong with reading the video modes from the BIOS. I tried a few other mini-distros too. Xvesa compiled for Puppy Linux works fine. It finds all the video modes, and scrolling is nice and fast. Xvesa for Feather Linux has the same problem. Any pointers on how to recompile Xvesa to test it out?

original here.