[Bug 90447] [SKL][Audio]cannot refresh the ELD information after xinit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90447

--- Comment #19 from Chris Wilson <chris at chris-wilson.co.uk> ---
The stance we have taken is that userspace is in charge of handling
notifications to topology changes - for a couple of reasons, this moves the
policy from the kernel to the user, and the other is that it should allow for
fast reconnection (often also desirable, but impossible if the kernel acts).

You actually need to run "udevadm monitor --property --tag-match=HOTPLUG" to
see if the hotplug event is indeed the uevent being sent. Equally a small X
client listening to RR notifications to confirm that they are being received
and propagated (X needs to be built with udev support for example). And
finally, but not last of all you need a client to respond to the RR
notifications and issue a new modeset (and that depends upon your
window/desktop/session manager).

As a last resort, an xrandr --auto, should issue the modeset required to
confirm that ELD notifications are being sent following a modeset following a
hotplug.

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