'\" t
.\"     Title: fb_find_mode
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Frame Buffer Library
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "FB_FIND_MODE" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Frame Buffer Library"
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.SH "NAME"
fb_find_mode \- finds a valid video mode
.SH "SYNOPSIS"
.HP \w'int\ fb_find_mode('u
.BI "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" ");"
.SH "ARGUMENTS"
.PP
\fIvar\fR
.RS 4
frame buffer user defined part of display
.RE
.PP
\fIinfo\fR
.RS 4
frame buffer info structure
.RE
.PP
\fImode_option\fR
.RS 4
string video mode to find
.RE
.PP
\fIdb\fR
.RS 4
video mode database
.RE
.PP
\fIdbsize\fR
.RS 4
size of
\fIdb\fR
.RE
.PP
\fIdefault_mode\fR
.RS 4
default video mode to fall back to
.RE
.PP
\fIdefault_bpp\fR
.RS 4
default color depth in bits per pixel
.RE
.SH "DESCRIPTION"
.PP
Finds a suitable video mode, starting with the specified mode in
\fImode_option\fR
with fallback to
\fIdefault_mode\fR\&. If
\fIdefault_mode\fR
fails, all modes in the video mode database will be tried\&.
.PP
Valid mode specifiers for
\fImode_option\fR:
.PP
<xres>x<yres>[M][R][\-<bpp>][@<refresh>][i][m] or <name>[\-<bpp>][@<refresh>]
.PP
with <xres>, <yres>, <bpp> and <refresh> decimal numbers and <name> a string\&.
.PP
If \*(AqM\*(Aq is present after yres (and before refresh/bpp if present), the function will compute the timings using VESA(tm) Coordinated Video Timings (CVT)\&. If \*(AqR\*(Aq is present after \*(AqM\*(Aq, will compute with reduced blanking (for flatpanels)\&. If \*(Aqi\*(Aq is present, compute interlaced mode\&. If \*(Aqm\*(Aq is present, add margins equal to 1\&.8% of xres rounded down to 8 pixels, and 1\&.8% of yres\&. The char \*(Aqi\*(Aq and \*(Aqm\*(Aq must be after \*(AqM\*(Aq and \*(AqR\*(Aq\&. Example:
.PP
1024x768MR\-8\fI60m\fR
\- Reduced blank with margins at 60Hz\&.
.SH "NOTE"
.PP
The passed struct
\fIvar\fR
is _not_ cleared! This allows you to supply values for e\&.g\&. the grayscale and accel_flags fields\&.
.PP
Returns zero for failure, 1 if using specified
\fImode_option\fR, 2 if using specified
\fImode_option\fR
with an ignored refresh rate, 3 if default mode is used, 4 if fall back to any valid mode\&.
.SH "COPYRIGHT"
.br