Hi Dave,
in kernel bug 43155, we found out that the HDMI audio controller on
AMD graphics is also disabled when the graphics chip is disabled via
vga-switcher:
https://bugzilla.kernel.org/show_bug.cgi?id=43155
This screws up the sound driver, takes too long time for boot.
Since the audio controller/codec becomes active again once when the
graphics is turned on, the best solution would be to add a client to
vga-swicheroo for handling the status of the HDMI audio controller.
But, looking at the current vga_switcheroo.c, it seems that the
current code assumes only two clients and doesn't consider about
non-graphics PCI entries.
As a workaround, I'm thiking of a sort of slave client belonging to
the video client, so that a callback like set_gpu_state() can be
called.
Or, if you have any better idea, let me know.
thanks,
Takashi
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