915gm/945gm/XAA lockup playing Xv video a second time (after mode-switch)

[Jesse Barnes]

On Friday, October 12, 2007 12:18 pm Peter Clifton wrote:
> The following seems to fix it for me by forcing a reset of the Xv
> regs after a mode-switch (Does the reset to VT1 clears them?),

Yeah, Enter/LeaveVT touch all sorts of regs.

> however I'm not sure whether it is a "fix" or a "workaround":
>
> --- xserver-xorg-video-intel-2.1.1.bwh.pcjc2.orig/src/i830_video.c   
>   2007-10-11 17:31:01.000000000 +0100 +++
> xserver-xorg-video-intel-2.1.1.bwh.pcjc2/src/i830_video.c  
> 2007-10-11 17:31:01.000000000 +0100 @@ -2927,6 +2927,7 @@
>          */
>         I830StopVideo(pScrn, pPriv, TRUE);
>         pPriv->overlayOK = FALSE;
> +       pPriv->current_crtc = NULL;
>         pPriv->oneLineMode = FALSE;
>      }
>  }

Patch looks reasonable to me, but Zhenyu should probably check just in 
case he wants to do it another way.

Jesse