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On T2 Macs with MMIO gmux, when GMUX_PORT_SWITCH_DISPLAY is read, it can have values of 2, 3, 4, and 5. Odd values correspond to the discrete gpu, and even values correspond to the integrated gpu. The current logic is that only 2 corresponds to IGD, but this doesn't work for T2 Macs. Instead, check the first bit to determine the connected gpu. As T2 Macs with gmux only can switch the internal display, it is untested if this change (or a similar change) would be applicable to GMUX_PORT_SWITCH_DDC and GMUX_PORT_SWITCH_EXTERNAL. Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Orlando Chamberlain <orlandoch.dev@gmail.com> Link: https://lore.kernel.org/r/20230303112842.3094-2-orlandoch.dev@gmail.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.