KMS + fb + FBIOPUT_VSCREENINFO

["Peter Hanzel" <hanzelpeter@gmail.com>]

Hello.

I have tried DRM with intel KMS and it is workiing. I am using only 
framebuffer console.
Fbcon initializes 1280x800 mode and it works like a charm.

But when I try to call FBIOPUT_VSCREENINFO on /dev/fb0, it always returns 
EINVAL,
I have checked drivers/gpu/drm/i915/intel_fb.c
and found that

intelfb_check_var        returns -EINVAL     if (var->pixclock == -1 || 
!var->pixclock)
intelfb_set_par             returns -EINVAL    if (var->pixclock != -1) { 
DRM_ERROR("PIXEL CLCOK SET\n");  return

So the FBIOPUT_VSCREENINFO always fails.

So is the change of resolution not supported through FBIOPUT_VSCREENINFO 
call?

Thanks.