[Libva] Disabling sync on vblank

[Ratin]

Shouldn't adding SwapbuffersWait parameter in /etc/X11/xorg.conf work?

Section "Device"
   Option "SwapbuffersWait" false
   Identifier  "Card0"
   Driver      "intel"
   BusID       "PCI:0:2:0"
EndSection

- Ratin

On Sun, Jun 26, 2016 at 8:46 AM, Xiang, Haihao <haihao.xiang at intel.com>
wrote:

>
> Hi Yann,
>
> vaPutSurface() is calling  DRI2SwapBuffers on X11 to display the image,
> the behavior is controlled by  display server. You may check
> xf86-video-intel for how is DRI2SwapBuffers implemented.
>
> Thanks
> Haihao
>
>
> >-----Original Message-----
> >From: Libva [mailto:libva-bounces at lists.freedesktop.org] On Behalf Of
> Yann
> >Dirson
> >Sent: Sunday, June 26, 2016 11:11 PM
> >To: libva at lists.freedesktop.org
> >Subject: [Libva] Disabling sync on vblank
> >
> >Hello,
> >
> >When I'm decoding a video (using i965-va-driver, libva 1.7.0) and
> >displaying frames using
> >vaPutSurface, it looks as if the latter was syncing on vblank: i
> >observe the frame rate of my
> >program to be exactly that of the video mode refresh.
> >
> >I would like to test if we can do triple-buffering rather than sync on
> >vblank, and see the
> >influence on the result.
> >
> >It does not look like any parameter honored by other software pieces
> >(Option VSync of the X intel
> >driver, XV_SYNC_TO_VBLANK, glx's vblank_mode) has any influence.
> >I cannot find any explicit reference to vsync or vblank in the libva
> >or va-driver source code,
> >and at first read (followed Broadwell path, admitedly quickly) it is
> >not obvious that the
> >intel-vaapi-driver exlicitly requires any synchro.  Can anyone shed some
> light ?
> >
> >Best regards,
> >--
> >Yann
> >_______________________________________________
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> >Libva at lists.freedesktop.org
> >https://lists.freedesktop.org/mailman/listinfo/libva
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