From: Henri Verbeet <hverbeet@gmail.com>
Subject: Re: [PATCH 1/7] winemac.drv: Add macdrv_get_gpus() helper.
Message-Id: <CAOsNvwzG6dPp29NSa_Usy9YzOuqS38f6P2hr3m5ArJPumeQ=Tg@mail.gmail.com>
Date: Wed, 24 Apr 2019 20:09:33 +0430
In-Reply-To: <9FAA7CED-9241-4F30-A563-9F22A386D405@codeweavers.com>
References: <000dcee0-600e-3263-4ccf-bcb94d9a9aa1@codeweavers.com> <46EB3F2A-9392-421C-B1BF-30F4EB4B118F@codeweavers.com> <b8a995b1-82af-ab54-8ef7-67494beb8ce8@codeweavers.com> <9FAA7CED-9241-4F30-A563-9F22A386D405@codeweavers.com>

On Wed, 24 Apr 2019 at 19:52, Ken Thomases <ken@codeweavers.com> wrote:
> Right, but with automatic graphics switching there are two GPUs that could potentially drive the main display.
>
This may be a slight tangent, but while early switchable GPUs had both
GPUs connected to the display through a multiplexer, on current setups
only the integrated/weak/low-power GPU is actually connected to the
display, and the other GPU is actually headless. The GPU connected to
the display is then responsible for getting the contents of the other
GPU onto the screen. I'm not sure how accurately that topology is
reflected by the relevant MacOS APIs.