fb.modes
NAME DESCRIPTION OPTIONS INTERNALS SEE ALSO
fb.modes - frame buffer modes file
/etc/fb.modes contains an unlimited number of video mode descriptions. The general format of a video mode is:
mode
geometry xresyres vxresvyres depth timings pixclockleft rightupper lowerhslen vslen options value''
endmode
geometry options:
xres
visible horizontal resolution (in pixels)
yres
visible vertical resolution (in pixels)
vxres
virtual horizontal resolution (in pixels)
vyres
virtual vertical resolution (in pixels)
depth
display depth (in bits per pixel)
timing options:
pixclock
length of one pixel (in picoseconds)
left
left margin (in pixels)
right
right margin (in pixels)
upper
upper margin (in pixel lines)
lower
lower margin (in pixel lines)
hslen
horizontal sync length (in pixels)
vslen
vertical sync length (in pixel lines)
other options:
the first value of this options is the default
hsync {low|high}
the horizontal sync polarity
vsync {low|high}
the vertical sync polarity
csync {low|high}
the composite sync polarity
extsync {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
laced {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
double {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
Generally a frame buffer display is organized as follows:
| | ^ | | | | | | 5 | | | | | v | | |
| # ^ # | | | # | # | | | # | # | | | 1 # | 2 # 3 | 4 | |##|| | # | # | | | # | 6 # | | | # | # | | | # v # | |
| | ^ | | | | | | 7 | | | | | v | | |
| | ^ | | | | | | 8 | | | | | v | | |
1 left margin 2 xres 3 right margin 4 horizontal sync len 5 upper margin 6 yres 7 lower margin 8 vertical sync len
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
htotal = left + xres + right + hslen vtotal = upper + yres + lower + vslen
The length of one line can now be calculated with pixclock
line = pixclock * htotal
and we have the horizontal frequency
hfreq = 1E12 / line = 1E12 / (pixclock * htotal)
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
if (lace) vtotal /= 2 if (double) vtotal *= 2
frame = vtotal * line
and we get also the vertical frequency
vfreq = 1E12 / frame = hfreq / vtotal
2 pages link to fb.modes(5):