LCD don't work after kernel recompilation

[Eriberto <jemf@gabcmt.eb.mil.br>]

Hello all,

I have a ECS A530 notebook (SiS 315). The problem: the LCD don't work 
after kernel recompilation, except in 640x480 mode. I used kernel 
2.6.12-2. The LCD works with 2.6.8-2 standard kernel (Debian Sarge 
Stable) and with Knoppix 4.0 in 800x600. However, I don't make the 
kernel works properly.

I Used:

CONFIG_FB_SIS=m
CONFIG_FB_SIS_300=y
CONFIG_FB_SIS_315=y

CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_LCD_CLASS_DEVICE=y
CONFIG_LCD_DEVICE=y

Can anybody help-me?

Thanks,

Eriberto