2.5.70 - Blank Screen with VESA VGA Framebuffer

I have a Sony VAIO laptop with ATI Mobility M1 AGP chip. I can use
XFree86 on 2.4.x if I enable VESA VGA Frame buffer and enable vga=788 on
kernel command line. With Kernel 2.5.70 after enabling VESA VGA
Framebuffer console and specifying vga= commandline, I just get a blank
screen just after the boot process starts and X doesn't work. (Garbled
screen). Without the vga= commandline, I get normal boot screen but X
needs the vga= option and doesn't work.

I have tried everything but to no avail. Does anyone know what do I need
to do in order to get kernel 2.5.X working with Framebuffer console
(VESA VGA or atyfb) and vga=788? I tried video=atyfb but that too
doesn't work.. 

Regards

Parag


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