[Intel-gfx] [PATCH] drm/i915: revert vga arbiter changes

Chris Wilson chris at chris-wilson.co.uk
Tue Oct 8 18:08:40 CEST 2013

On Tue, Oct 08, 2013 at 05:27:28PM +0200, Daniel Vetter wrote:
> Adding drm/i915 into the vga arbiter chain means that X (in a piece of
> well-meant paranoia) will do a get/put on the vga decoding around
> _every_ accel call down into the ddx. Which results in some nice
> performance disasters [1].

And disables DRI for the system, interferring with the use of OpenGL
compositors, playing games, PRIME, etc. This effect is not limited to
users of i915, but any system with a dGPU and an igfx enabled Core CPU.

I still think we are downplaying the complete and utter disaster caused
by X and the patch, and why the revert is required.

Chris Wilson, Intel Open Source Technology Centre

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