[Bug 59785] [dual-gpu regression] Display shuts off when switching to discrete graphics card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59785

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
That sounds like the root cause of the issue - that you have no acpi (or mux?)
driver for the backlight that knows how to route it through the mux.

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