[Intel-gfx] DRI3 only DDX driver

[Steven Newbury]

On Fri, 2014-10-17 at 11:13 +0100, Steven Newbury wrote:
> On Mon, 2014-09-01 at 12:09 +0100, Steven Newbury wrote:
> > I tried building the xorg intel ddx driver with only DRI3 support,
> > with DRI1 and DRI2 disabled.
> > 
> > glxinfo says direct rendering is enabled, but gives no core
> > contexts*.
> > 
> > gnome-shell appears to be using software fallback, generally there
> > seems to be no hardware acceleration.  I'm wondering if DRI3 isn't
> > ever initialising successfully, and now there's no DRI2 to fall 
> > back
> > to.
> > 
> > What is the minimal kernel version for DRI3?  I'm currently stuck 
> > on
> > the 3.14 stable series due to an unresolved kernel bug (which I 
> > need
> > to bisect...), is it too old?
> > 
> > I remember before the intel (SNA) support landed 
> > LIBGL_DEBUG=verbose
> > used to mention DRI3 failing, I see nothing mentioning DRI3 at all
> > now.  Is there some way of determining which DRI extension is in 
> > use?
> > DRI3 is properly listed in xdpyinfo.
> > 
> > 
> > * I also get no core contexts also with xwayland/glx, related?
> 
> As a follow-up, I think this is related to
> https://bugs.freedesktop.org/show_bug.cgi?id=85064
> 
> Something tells me DRI3 isn't really working with i965.  This is
> largely going unnoticed since when DRI2 is available it's usually 
> used
> instead.  webkit-gtk is not falling back to DRI2 without DRI3 being
> specifically disabled with LIBGL_DRI3_DISABLE=1.
> 
Sorry for replying to myself again!  I should have mentioned, I'm back 
on the current kernel now, so that can be eliminated.

I get the same behaviour with uxa/glamor backends as with sna.  It's 
still suspicious to me that core contexts are unavailable with DRI3, 
either with the intel driver build with --disable-dri2, or from 
xwayland.
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