poulsbo-driver-2d, mplayer, vaapi, isDRI1Connected

Compiling mplayer-vaapi on ubuntu intrepid (i386) from this repository:
https://launchpad.net/~fitpc2/+archive/ppa

results in mplayer crashing before starting playback:

/home/julius/mplayer/mplayer-install/bin/mplayer -vo vaapi -va vaapi somefile.mkv
MPlayer SVN-r29479-4.3.2 (C) 2000-2009 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing somefile.mkv
[mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0
[mkv] Track ID 2: audio (A_DTS) "German DTS 754kbps", -aid 0, -alang ger
[mkv] Track ID 3: audio (A_DTS) "English DTS 1509kbps", -aid 1, -alang eng
[mkv] Track ID 4: subtitles (S_TEXT/UTF8) "German", -sid 0, -slang ger
[mkv] Will play video track 1.
Matroska file format detected.
VIDEO: [avc1] 1920x816 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s)
libva: libva version 0.30.4-sds2
mplayer: dri1_util.c:110: isDRI1Connected: Assertion `dri_state->fd >= 0' failed.

MPlayer interrupted by signal 6 in module: preinit_libvo
- MPlayer crashed. This shouldn't happen.
  It can be a bug in the MPlayer code _or_ in your drivers _or_ in your
  gcc version. If you think it's MPlayer's fault, please read
  DOCS/HTML/en/bugreports.html and follow the instructions there. We can't and
  won't help unless you provide this information when reporting a possible bug.