Help: "XF86DGAGetVideo:failed to map video memory". I used libXxf86dga-1.1.1 on Ubuntu 10.04 on intel GMA 4500MHD(Intel GM45 chipset)

[Ville Syrjälä]

On Mon, Oct 10, 2011 at 07:31:02PM -0700, Corbin Simpson wrote:
> On Mon, Oct 10, 2011 at 6:12 PM, Focus.Luo <luoyanqing at sjtu.org> wrote:
> > Hi all,
> >
> > 1, Does the intel GM45 chipset support DGA(direct graphic access)?
> >
> > 2, If it supports, why I used the function
> > XF86DGAGetVideo(dis, DefaultScreen(dis), &addr, &width, &bank, &ram); and It
> > returen "XF86DGAGetVideo:failed to map video memory". But I used the
> > function XF86DGAQueryDirectVideo, It work well. Does somebody can help me?
> >
> > thanks,
> >
> >
> >
> > DGA(direct graphic access) Lib: libXxf86dga-1.1.1
> >
> > Xserver: xorg
> >
> > Graphic Driver: intel_drv.so 2.9.1
> >
> > OS: Ubuntu 10.04
> >
> > Gpaphic: intel GMA 4500MHD(Intel GM45 chipset)
> 
> Hi,
> 
> DGA 1, with all of the direct video access, is dead in the core
> server. (Blessedly.) The DGA 2 mouse stuff lives on, though.

The code lives on, but it's practically useless. DGA 1 relative input
event support is the only usable feature left. Here's a brief
explanation: http://lists.x.org/archives/xorg-devel/2011-January/018507.html

I was considering some kind of rewrite of DGA (possibly on top of DRI2
and XI2), but decided against it due to the marginal status of DGA.

-- 
Ville Syrjälä
syrjala at sci.fi
http://www.sci.fi/~syrjala/