Plug in the dxr3 card

run lspci - there it is
01:09.0 Multimedia controller: Sigma Designs, Inc. REALmagic Hollywood Plus DVD Decoder (rev 02)
01:09.0 0480: 1105:8300 (rev 02)


emerge =mplayer-1.0_rc2_p26753-r1
(because I have an overlay with dxr3 forced on)

Checking for NAS ... no
Checking for DXR2 ... no
Checking for DXR3/H+ ... no
Checking for IVTV TV-Out (pre linux-2.6.24) ... no

The autodection failed. 
No kernel support or firmware is loaded yet.  Just plug in the card.
Nasty side effect. I don't have the loop through cable connected and my nVidia
with the binary driver is convinced its a secondary display, so I see nothing
on the monitor in Xorg. Console is ok though.

The build log contains

<quote>
Config files successfully generated by ./configure --cc=i686-pc-linux-gnu-gcc --host-cc=i686-pc-linux-gnu-gcc --prefix=/usr --confdir=/etc/mplayer --datadir=/usr/share/mplayer --libdir=/usr/lib --enable-menu --enable-network --disable-tv-bsdbt848 --disable-faad-external --disable-ivtv --disable-pvr --disable-fribidi --disable-enca --disable-nemesi --disable-libcdio --disable-libdv
--disable-x264 --disable-x264-lavc --disable-ass --charset=UTF-8 --disable-lirc --disable-lircc --disable-joystick --disable-smb --disable-dvb --disable-dvbhead --disable-tv-teletext --disable-radio-v4l2 --disable-radio-bsdbt848 --disable-live --disable-musepack --disable-pnm --disable-speex --disable-libamr_nb --disable-libamr_wb --disable-twolame --disable-toolame --xanimcodecsdir=/usr/lib/xanim/mods --realcodecsdir=/opt/RealPlayer/codecs --disable-directfb --disable-ggi --disable-aa --disable-zr --enable-gui --enable-xvmc --with-xvmclib=XvMCW --disable-3dfx --disable-tdfxvid --disable-tdfxfb --disable-arts --disable-jack --disable-ladspa --disable-nas --disable-openal --disable-pulse --disable-sse2 --disable-ssse3 --disable-altivec !

  Install prefix: /usr
  Data directory: /usr/share/mplayer
  Config direct.: /etc/mplayer

  Byte order: little-endian
  Optimizing for: native

  Languages:
    Messages/GUI: en
    Manual pages: en en

  Enabled optional drivers:
    Input: ftp tv-v4l2 tv-v4l tv cddb cdda libdvdcss(internal) dvdread(internal) vcd network
    Codecs: xvid libavcodec qtx real xanim win32 faad2 faac libmpeg2 libdca liba52 mp3lib libtheora tremor(internal) libmad liblzo gif
    Audio output: alsa esd oss v4l2 sdl mpegpes(file)
    Video output: v4l2 sdl gif89a jpeg png mpegpes(file) fbdev svga caca xvidix cvidix opengl dga xvmc xv x11 xover md5sum tga
  Disabled optional drivers:
    Input: dvdnav vstream pvr radio tv-teletext tv-dshow live555 nemesi dvb smb
    Codecs: x264 libdv libamr_wb libamr_nb musepack speex toolame twolame
    Audio output: sun openal jack pulse arts ivtv dxr2 nas
    Video output: zr zr2 ivtv dxr3 dxr2 vesa pnm aa ggi xmga mga winvidix 3dfx dfbmga directfb bl xvr100 tdfx_vid s3fb tdfxfb
   
</quote>

dxr3 is in the Disabled optional drivers list but its not got a --disable config flag. That reads as if mplayer is not being
consistant in the way it treats dxr3.  i.e. some bits assume its off, some on, unless its explictly stated.

configure.log says

 ============ Checking for DXR3/H+ ============

#include <linux/em8300.h>
int main(void) { return 0; }

i686-pc-linux-gnu-gcc -march=athlon-xp -pipe -O2 -fomit-frame-pointer -D__STDC_LIMIT_MACROS  -I/usr/X11R6/include -I/usr/include/ -I/usr/include/SDL  -D_REENTRANT     -lncurses -lpng -lz -ljpeg -lgif   -lXext -lX11 -lpthread -lXss -lXv -lXvMC -lXvMCW -lXinerama -lXxf86vm -lXxf86dga -lGL -ldl -L/usr/lib -lcaca -lcucul -lvga -lSDL -lpthread  -o /var/tmp/portage/media-video/mplayer-1.0_rc2_p26753-r1/temp/mplayer-conf-24052-4402 /var/tmp/portage/media-video/mplayer-1.0_rc2_p26753-r1/temp/mplayer-conf-8164-4402.c
/var/tmp/portage/media-video/mplayer-1.0_rc2_p26753-r1/temp/mplayer-conf-8164-4402.c:1:26: error: linux/em8300.h: No such file or directory


Result is: no

So its looking for em8300.h which is one of the files provided by the driver for the card and on my system,
its not there anyway, so thats ok. 

Next step - install the driver.

emerge media-video/em8300-modules gets me   media-video/em8300-modules-0.16.4-r1
That installed agaist Linux spike 2.6.23-gentoo-r6 #2 PREEMPT Sun Jan 20 11:26:25 GMT 2008 i686 AMD Athlon(tm) XP 3200+ 
AuthenticAMD GNU/Linux
That means my linux symlink is broken but its ok for the investigation - I just need to use that kernel.

emerge =mplayer-1.0_rc2_p26753-r1 still shows

Checking for DXR2 ... no 
Checking for DXR3/H+ ... no 
Checking for IVTV TV-Out (pre linux-2.6.24) ... no 

So its not detecting linux/em8300.h

Add in media-video/em8300-libraries, get  media-video/em8300-libraries-0.16.4

emerge belongs em8300 fails to find em8300.h
So either Gentoo does not install it but should, or its been removed but mplayer still looks for it.