fbset not working

Miklós Márton
I have an mini2440 board with 3.5"LCD. 
I have compiled Angstrom distro with openembeddded. It works fine. but
theres is an ~ 15 px wide blank stripo on the left side. 
I have tried to reduce the left margin with fbset, but no success. 
The busybox's fbset always print the current mode, and did not modify
anything. 

So I have bitbaked the normal fbset. It created the fbset.real. It has fine
help, and more options than the busybox's fbset. 
Unfortunatelly it gives me:
ioctl FBIOPUT_VSCREENINFO: Invalid argument
to every modify command.