v4l-conf - configure a video4linux driver
v4l-conf [ options ]
v4l-conf is a small helper tool. It figures out the video mode and
framebuffer base address of the graphics board and configures a
video4linux driver like bttv. This is needed for drivers which can DMA
the video over PCI directly into the video memory.
Usually it is not required to use v4l-conf manually, xawtv(1) and
fbtv(1) run it automatically at startup. It might be useful for
trouble-shooting. v4l-conf must be installed suid-root.
v4l-conf knows three ways to get the informations:
* Query the X-Server using the XF86 DGA extension. This is the
default if the DISPLAY environment variable is set.
* Query the framebuffer driver. This is the default if DISPLAY is not
* Query the console driver. This is used on mklinux only.
-h Print a short description of all command line options.
-q Be quiet.
Use the X11 display dpy to get the parameters.
-f Use the framebuffer driver to get the parameters.
Set the video4linux device.
enforce n bpp color depth. Works for switching between 15/16 and
Shift the video display by n bytes.
Set framebuffer address to adr. The value should be specified in
hex. This option is allowed for root only. You can’t overwrite
the autodetected value, this switch is only useful if autodetect
doesn’t work because the X-Server lacks DGA support. You can put
this into /etc/conf.modules, as "post-install bttv ..." for
Hope I haven’t any security flaws in there. If you find one, drop me a
note. Mails with patches are preferred :-)
Gerd Knorr <firstname.lastname@example.org>
Copyright (C) 1997-99 Gerd Knorr <email@example.com>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA.
(c) 1997-99 Gerd Knorr v4l-conf(8)