[Bug 91929] New: Missing RandR events on hotplug

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 91929
           Summary: Missing RandR events on hotplug
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: loic.yhuel at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

When investigating https://bugs.kde.org/show_bug.cgi?id=346455, I found I don't
get all XRandR events on hotplug until someones calls RRGetInfo (either
"randr", or XRRGetScreenResources in "xev -event randr"), or a VT switch.

By default when plugging the HDMI cable I only get :
 - RRScreenChangeNotify
 - XRROutputChangeNotifyEvent with RR_Disconnected
When using xev, or calling xrandr, I get :
 - a second RRScreenChangeNotify
 - XRROutputChangeNotifyEvent with RR_Connected

On unplug, it seems to be the same (not 100% reliable, sometimes the kernel
doesn't generate any uevent) : I get "dummy" events (RRScreenChangeNotify +
XRROutputChangeNotifyEvent with RR_Connected), and won't get the
RR_Disconnected until someones calls RRGetInfo.

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