fb_find_mode(9)
NAME
fb_find_mode - finds a valid video mode
SYNOPSIS
int fb_find_mode(struct fb_var_screeninfo * var, struct fb_info * info,
const char * mode_option,
const struct fb_videomode * db, unsigned int dbsize,
const struct fb_videomode * default_mode,
unsigned int default_bpp);
ARGUMENTS
- var
- frame buffer user defined part of display
- info
- frame buffer info structure
- mode_option
- string video mode to find
- db
- video mode database
- dbsize
- size of db
- default_mode
- default video mode to fall back to
- default_bpp
- default color depth in bits per pixel
DESCRIPTION
Finds a suitable video mode, starting with the specified mode in
mode_option with fallback to default_mode. If default_mode fails, all
modes in the video mode database will be tried.
Valid mode specifiers for mode_option:
<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m] or
<name>[-<bpp>][@<refresh>]
with <xres>, <yres>, <bpp> and <refresh> decimal numbers and <name> a
string.
If ´M´ is present after yres (and before refresh/bpp if present), the
function will compute the timings using VESA(tm) Coordinated Video
Timings (CVT). If ´R´ is present after ´M´, will compute with reduced
blanking (for flatpanels). If ´i´ is present, compute interlaced mode.
If ´m´ is present, add margins equal to 1.8% of xres rounded down to 8
pixels, and 1.8% of yres. The char ´i´ and ´m´ must be after ´M´ and
´R´. Example:
1024x768MR-860m - Reduced blank with margins at 60Hz.
NOTE
The passed struct var is _not_ cleared! This allows you to supply
values for e.g. the grayscale and accel_flags fields.
Returns zero for failure, 1 if using specified mode_option, 2 if using
specified mode_option with an ignored refresh rate, 3 if default mode
is used, 4 if fall back to any valid mode.