As Julien wrote, /usr/lib/xorg/modules/drivers/mga_drv.so is not a VA-API driver.
According to http://www.freedesktop.org/wiki/Software/vaapi there is no driver for Matrox MGA and there is also no mga_drv_video.so in Debian sid: jluebbe@polaris: ~ $ apt-file search mga_drv_video.so jluebbe@polaris: ~ $ apt-file search drv_video.so i965-va-driver: /usr/lib/dri/i965_drv_video.so libva1: /usr/lib/dri/dummy_drv_video.so vdpau-va-driver: /usr/lib/dri/nvidia_drv_video.so vdpau-va-driver: /usr/lib/dri/s3g_drv_video.so vdpau-va-driver: /usr/lib/dri/vdpau_drv_video.so xvba-va-driver: /usr/lib/dri/fglrx_drv_video.so xvba-va-driver: /usr/lib/dri/xvba_drv_video.so jluebbe@polaris: ~ $ Thus, this bug should be closed. Regrads, Jan -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org