[Bug 91929] Missing RandR events on hotplug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91929

--- Comment #7 from Loïc Yhuel <loic.yhuel at gmail.com> ---
Kscreen doesn't run in kwin, but in kded5 (decides which config to apply), and
kscreen_backend_launcher (XRandR calls). These two parts communicate over DBus.

So you have XRandR events from hotplug, which generate DBus signals from the
backend to the daemon, which calls the backend, which generates other events...


It doesn't use xcb_randr_get_screen_info (only for XRandR 1.1 backend).

It uses xcb_randr_get_screen_resources, but only once. After it uses
xcb_randr_get_screen_resources_current (see
https://quickgit.kde.org/?p=libkscreen.git&a=blob&h=fae1dcc971d5d3a16e95bfa745d6822c69fa2a55&hb=effd39e2ebe767868660b52a8758873e45e4c656&f=backends%2Fxrandr%2Fxrandr.cpp).
So it doesn't do a full reprobe (RRGetInfo).


On XRROutputChangeNotifyEvent with RR_Connected, it will call
XRandROutput::update -> XRandROutput::init -> XRandROutput::updateModes, which
uses xcb_randr_get_screen_resources_current.

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