struct fb_var_screeninfo {    __u32 xres;            /* visible resolution        */    __u32 yres;    __u32 xres_virtual;        /* virtual resolution        */    __u32 yres_virtual;    __u32 xoffset;            /* offset from virtual to visible */    __u32 yoffset;            /* resolution            */    __u32 bits_per_pixel;        /* guess what            */    __u32 grayscale;        /* != 0 Graylevels instead of colors */    struct fb_bitfield red;        /* bitfield in fb mem if true color, */    struct fb_bitfield green;    /* else only length is significant */    struct fb_bitfield blue;    struct fb_bitfield transp;    /* transparency            */        __u32 nonstd;            /* != 0 Non standard pixel format */    __u32 activate;            /* see FB_ACTIVATE_*        */    __u32 height;            /* height of picture in mm */    __u32 width;            /* width of picture in mm */    __u32 accel_flags;        /* (OBSOLETE) see fb_info.flags */    /* Timing: All values in pixclocks, except pixclock (of course) */    __u32 pixclock;            /* pixel clock in ps (pico seconds) */    __u32 left_margin;        /* time from sync to picture    */    __u32 right_margin;        /* time from picture to sync    */    __u32 upper_margin;        /* time from sync to picture    */    __u32 lower_margin;    __u32 hsync_len;        /* length of horizontal sync    */    __u32 vsync_len;        /* length of vertical sync    */    __u32 sync;            /* see FB_SYNC_*        */    __u32 vmode;            /* see FB_VMODE_*        */    __u32 rotate;            /* angle we rotate counter clockwise */    __u32 reserved[5];        /* Reserved for future compatibility */};