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-.TH fb.modes 8 "Aug 1996" local "Linux frame buffer utils"
-.SH NAME
-fb.modes \- frame buffer modes file
-.SH DESCRIPTION
-.I /etc/fb.modes
-contains an unlimited number of video mode descriptions. The general format
-of a video mode is:
-.sp
-mode
-.RI \" name \"
-.RS
-geometry
-.RI < xres >
-.RI < yres >
-.RI < vxres >
-.RI < vyres >
-.RI < depth >
-.br
-timings
-.RI < pixclock >
-.RI < left >
-.RI < right >
-.RI < upper >
-.RI < lower >
-.RI < hslen >
-.RI < vslen >
-.br
-.B options
-.RI < value >
-.RE
-endmode
-.SH OPTIONS
-geometry options:
-.RS
-.TP
-.I xres
-visible horizontal resolution (in pixels)
-.TP
-.I yres
-visible vertical resolution (in pixels)
-.TP
-.I vxres
-virtual horizontal resolution (in pixels)
-.TP
-.I vyres
-virtual vertical resolution (in pixels)
-.TP
-.I depth
-display depth (in bits per pixel)
-.RE
-.PP
-timing options:
-.RS
-.TP
-.I pixclock
-length of one pixel (in picoseconds)
-.TP
-.I left
-left margin (in pixels)
-.TP
-.I right
-right margin (in pixels)
-.TP
-.I upper
-upper margin (in pixel lines)
-.TP
-.I lower
-lower margin (in pixel lines)
-.TP
-.I hslen
-horizontal sync length (in pixels)
-.TP
-.I vslen
-vertical sync length (in pixel lines)
-.RE
-.PP
-other options:
-.RS
-the first value of this options is the default
-.TP
-.IR \fBhsync "\ {" low | high }
-the horizontal sync polarity
-.TP
-.IR \fBvsync "\ {" low | high }
-the vertical sync polarity
-.TP
-.IR \fBcsync "\ {" low | high }
-the composite sync polarity
-.TP
-.IR \fBextsync "\ {" false | true }
-enable or disable external resync. If enabled the sync timings are not
-generated by the frame buffer device and must be provided externally
-instead. Note that this option may not be supported by every frame buffer
-device
-.TP
-.IR \fBlaced "\ {" false | true }
-enable or disable interlace. If enabled the display will be split in two
-frames, each frame contains only even and odd lines respectively. These two
-frames will be displayed alternating, this way twice the lines can be
-displayed and the vertical frequency for monitor stays the same, but the
-visible vertical frequency gets halved
-.TP
-.IR \fBdouble "\ {" false | true }
-enable or disable doublescan. If enabled every line will be displayed twice
-and this way the horizontal frequency can easily be doubled, so that the
-same resolution can be displayed on different monitors, even if the
-horizontal frequency specification differs. Note that this option may not be
-supported by every frame buffer device
-.RE
-.SH INTERNALS
-Generally a frame buffer display is organized as follows:
-.sp
-.ad c
-+\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-+\-\-\-+
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " ^ "\ \ \ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " | "\ " \fI5 "\ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " v "\ \ \ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-+\-\-\-#################\-\-\-+\-\-\-+
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " ^ "\ \ \ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " | "\ \ \ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " | "\ \ \ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-.RI "| " 1 " #       " \fB| "   " 2 "   # " 3 " | " 4 " |"
-.br
-.RB "|" "<\->" "#" "<\-\-\-\-\-\-+\-\-\-\-\-\->" "#" "<\->" "|" "<\->" "|"
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " | "\ \ \ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " | "\ " \fI6 "\ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " | "\ \ \ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ #\ \ \ \ \ \ \ " v "\ \ \ \ \ \ \ #\ \ \ |\ \ \ |"
-.br
-+\-\-\-#################\-\-\-+\-\-\-+
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " ^ "\ \ \ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " | "\ " \fI7 "\ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " v "\ \ \ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-+\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-+\-\-\-+
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " ^ "\ \ \ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " | "\ " \fI8 "\ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-.RB "|\ \ \ |\ \ \ \ \ \ \ " v "\ \ \ \ \ \ \ |\ \ \ |\ \ \ |"
-.br
-+\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-+\-\-\-+
-.sp
-.ad n
-.RS
-.I 1
-\t left margin
-.br
-.I 2
-\t xres
-.br
-.I 3
-\t right margin
-.br
-.I 4
-\t horizontal sync len
-.br
-.I 5
-\t upper margin
-.br
-.I 6
-\t yres
-.br
-.I 7
-\t lower margin
-.br
-.I 8
-\t vertical sync len
-.RE
-.sp
-The area bordered with `#' is the visible display area. Horizontal and
-vertical frequencies can now easily be calculated, for this the sum of
-horizontal or vertical values are important
-.RS
-.sp
-htotal\ =\ left\ +\ xres\ +\ right\ +\ hslen
-.br
-vtotal\ =\ upper\ +\ yres\ +\ lower\ +\ vslen
-.sp
-.RE
-The length of one line can now be calculated with pixclock
-.RS
-.sp
-line\ =\ pixclock\ *\ htotal
-.sp
-.RE
-and we have the horizontal frequency
-.RS
-.sp
-hfreq\ =\ 1E12\ /\ line\ =\ 1E12\ /\ (pixclock\ *\ htotal)
-.sp
-.RE
-To get the vertical frequency vtotal must eventually adjusted. If the
-display is laced, vtotal must be halved or if the display is a doublescan
-one, vtotal must be doubled. Now we can calculate the length of one frame
-.RS
-.sp
-if\ (lace)\ \ \ vtotal\ /=\ 2
-.br
-if\ (double)\ vtotal\ *=\ 2
-.sp
-frame\ =\ vtotal\ *\ line
-.sp
-.RE
-and we get also the vertical frequency
-.RS
-.sp
-vfreq\ =\ 1E12\ /\ frame\ =\ hfreq\ /\ vtotal
-.sp
-.RE
-.SH SEE ALSO
-.BR fbset "(8), " fbdev (4)