radeonfb problem

Hello,
I have 19" lcd display, which native resolution is 1280x1024.
I have been trying to turn on framebuffer under that resolution, but I 
wasn't able to do that.
All I can do is :
1) set 1024x768 resolution, by adding vga=0x317 to my grub.conf
2) set 1280x1024 by typing "modprobe radeonfb", after the framebuffer is 
on by vga=0x317
I've tried to add :
vga=0x307 video=radeonfb:1280x1024-24@60
but it didn't worked.
When I try to get my native resolution the screen is black, and I can't 
even turn on display's OSD menu.
I would be grateful for your help,
 
                         Tomek


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