[Linux-fbdev-devel] (no subject)

[=?iso-8859-1?Q?<p.g...@li...>]

Hi,=0D=0AI have a problem when I change the bpp value, here is the code:=0D=
=0A=0D=0Aif( ioctl(fbd, FBIOGET_VSCREENINFO, &var_info) =3D=3D -1){=0D=0A=
	perror("\nError IOCTL 1");=0D=0A	exit(0);=0D=0A}           =0D=0Aprintf(=
"\n bpp: %d", var_info.bits_per_pixel);   // output is  bpp: 16=0D=0Avar_=
info.bits_per_pixel =3D 24;=0D=0Aif( ioctl(fbd, FBIOPUT_VSCREENINFO, &var=
_info) =3D=3D -1){=0D=0A	perror("\nError IOCTL 2");=0D=0A	exit(0);=0D=0A}=
           =0D=0AThe program exit with the following message error: =0D=0A=
Error IOCTL 2: Invalid argument=0D=0A=0D=0AHow can I set the bpp value? S=
hould I modify the file /etc/X11/XF86Config?=0D=0A=0D=0AI have another pr=
oblem, I try to write a simple program that reads frame from framebuffer =
and then creates a Divx file of a few seconds.=0D=0AI map the framebuffer=
 to a buffer, but the program crash with a segmentation fault:=0D=0A     =
                                            =0D=0A    screen_buffer =3D (=
char *)malloc(DIM_BUFFER * sizeof(char));=0D=0A    screen_buffer =3D (voi=
d *)mmap(0, DIM_BUFFER, PROT_READ, MAP_SHARED, fbd, 0);                 =0D=
=0A	=0D=0A    encFrame.image =3D (void *)screen_buffer;  <--- causes seg =
fault=0D=0A=0D=0AWhat's wrong?  =0D=0A=0D=0AThanks,=0D=0APaolo Gilardetti=
=0D=0A	 =0D=0A