Hi all,
Some time ago, I asked some questions about how to handle issues with
DRM drivers attempting to touch eDP while muxed away, due to implicit
assumptions about eDP being permanently connected. I've proposed some
changes which prevent eDP access on switched-away eDP outputs for at
least i915, but now I'd like to follow up on one of the topics that was
brought up during that previous conversation: namely, how to deal with
systems with multiple mux devices, where it may be desirable to address
the muxes independently of each other. Currently, the apple-gmux driver
seems to support multiple muxes by just switching them in sync with each
other, exposing only one logical mux device to the vga-switcheroo
subsystem to control both physical muxes.
Since then, I've proposed a driver for a mux that is present on some
upcoming notebook designs, some of which have distinct muxes for
internal and external display connections [1]. I don't believe any of
these systems are available publicly just yet, but it's only a matter of
time before they are. During the previous discussion, I believe Daniel
Vetter stated that the ability to address multiple muxes is something
that could be addressed when designing a "proper" userspace API for
vga-switcheroo (i.e., not debugfs), so I'd like to get the conversation
started on how we could go about designing this API.
[1] https://patchwork.kernel.org/patch/11751453/
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