[Bug 216376] AMDGPU: display output disables and quickly reenables when switching AVR into/from standby doing HDMI passthrough

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216376

Alex Deucher (alexdeucher@gmail.com) changed:

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                 CC|                            |alexdeucher@gmail.com

--- Comment #3 from Alex Deucher (alexdeucher@gmail.com) ---
I suspect the receiver toggles the hotplug pin when it switches to/from
passthrough mode notify the GPU that the EDID will change (e.g., from receiver
audio to monitor audio) otherwise the GPU won't know that the receiver is no
longer part of the chain.  The driver doesn't actually do anything when it
receives this hotplug interrupt.  It just tells userspace.  Your desktop
environment listens for hotplug events and then acts on them (either enabling
or disabling displays).  Your best bet is probably to change the behavior of
your desktop environment when it receives a hotplug notification. 
Alternatively, you could try and block drm hotplug events in udev.

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