[Bug 91929] Missing RandR events on hotplug

[bugzilla-daemon at freedesktop.org]

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

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm, nasty. So,

diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 1b1a125..0a59d1d 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -4900,6 +4900,7 @@ void sna_mode_discover(struct sna *sna)
                                DBG(("%s: output %s (id=%d), changed state,
reprobing\n",
                                     __FUNCTION__, output->name,
sna_output->id));
                                sna_output->last_detect = 0;
+                               changed |= 4;
                        }
                        continue;
                }
@@ -4918,7 +4919,8 @@ void sna_mode_discover(struct sna *sna)
                changed |= 2;
        }

-       if (changed) {
+       /* Have the list of available outputs been updated? */
+       if (changed & 3) {
                DBG(("%s: outputs changed, broadcasting\n", __FUNCTION__));

                sna_mode_set_primary(sna);
@@ -4933,7 +4935,9 @@ void sna_mode_discover(struct sna *sna)
                xf86RandR12TellChanged(screen);
        }

-       RRGetInfo(screen, TRUE);
+       /* If anything has changed, refresh the RandR information */
+       if (changed)
+               RRGetInfo(screen, TRUE);
        RRTellChanged(screen);
 }

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