I'm seeing the same issue. What appears to be happening is that there
are multiple outputs with the same name, but with different properties.
After breaking in gsd_rr_config_match at the end of
gsd_rr_config_load_current:
(gdb) p c1->priv->outputs[9]->priv->name
$54 = 0x1b3b370 "DP-3"
(gdb) p c1->priv->outputs[3]->priv->name
$55 = 0x1b3b2f0 "DP-3"
(gdb) p c1->priv->outputs[9]->priv->product
$56 = 0
(gdb) p c1->priv->outputs[3]->priv->product
$57 = 41150
(gdb) p c1->priv->outputs[3]->priv->vendor
$58 = "DEL"
(gdb) p c1->priv->outputs[9]->priv->vendor
$59 = "\000\000\000"
(gdb) p c1->priv->outputs[9]->priv->serial
$60 = 0
(gdb) p c1->priv->outputs[3]->priv->serial
$61 = 808666700
I assume these duplicates come from XRRGetScreenResources, which means
it might be a driver issue.
Are you using the NVIDIA binary driver by any chance? (I am)
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https://bugs.launchpad.net/bugs/1542699
Title:
unity-settings-daemon crashed with SIGABRT in g_assertion_message()
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