1. SWIN problem First, I ioctled GCAP and there was VID_TYPE_OVERLAY. next, GFBUF-SFBUF-GWIN-SWIN. ( I've got DGA base address from X server using XF86DGAGetVideoLL function and passed it to video_window's base member. ) But when I ioctled SWIN, it returned -1. so I can't start capture. 2. xawtv I've got xawtv from Gerd's page, and 'rpm -ta'ed and installed all progs using -Uvh switch. Running xawtv, it told me that ... -----message------- image format list for port 43 inux/i686 (2.2.18) Xv: using port 42 for video 0x32315659 (YV12) planar 0x30323449 (I420) planar Xv: no usable image format found (port 43) The app-defaults file is not correctly installed. Your fault (core dumped) --------------------- 3. dga executable binary from XFree 4.0.2 It is 'small program testing DGA extension'. In addition to manual ( man dga ), it should display some information and fill the screen with a different color by key stroke. But not my case. No information, and after keystroke(except q:quit) all system operation halted (screen filled with some color). I reinstalled my box to avoid these problems, but in the same situation. does anybody knows about these problems?