[Intel-gfx] DRI3 only DDX driver

[Steven Newbury]

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.
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