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monitor-config-manager: Fallback to closed laptop lid configuration

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When closing the lid of a laptop, we reconfigure all the monitors in order
to update the CRTCs and (if enabled) the global UI scaling factor.

To do this, we try first to reuse the current configuration for the usable
monitors, but if we have only monitor enabled and this one is on the laptop
lid we just end up creating a new configuration where the primary monitor is
the laptop one (as per find_primary_monitor() in MetaMonitorConfigManager),
but ignoring the user parameters.

In case the user selected a different resolution / scaling compared to the
default one, while the laptop lid is closed we might change the monitors
layout, causing applications to rescale or reposition.

To avoid this, when creating the monitors configuration from the current
current state, in case we have only one monitor available and that one is
the laptop panel, let's just reuse this configuration.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1200

(cherry-picked from commit e48516679c)
This commit is contained in:
Marco Trevisan (Treviño) 2020-04-16 00:28:05 +02:00
parent f3420b0341
commit 079a625eaa
1 changed files with 15 additions and 3 deletions
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18
src/backends/meta-monitor-config-manager.c
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@ -330,23 +330,35 @@ MetaMonitorsConfigKey *
meta_create_monitors_config_key_for_current_state (MetaMonitorManager *monitor_manager)
{
MetaMonitorsConfigKey *config_key;
MetaMonitorSpec *laptop_monitor_spec;
GList *l;
GList *monitor_specs;
laptop_monitor_spec = NULL;
monitor_specs = NULL;
for (l = monitor_manager->monitors; l; l = l->next)
{
MetaMonitor *monitor = l->data;
MetaMonitorSpec *monitor_spec;
if (meta_monitor_is_laptop_panel (monitor) &&
meta_monitor_manager_is_lid_closed (monitor_manager))
continue;
if (meta_monitor_is_laptop_panel (monitor))
{
laptop_monitor_spec = meta_monitor_get_spec (monitor);
if (meta_monitor_manager_is_lid_closed (monitor_manager))
continue;
}
monitor_spec = meta_monitor_spec_clone (meta_monitor_get_spec (monitor));
monitor_specs = g_list_prepend (monitor_specs, monitor_spec);
}
if (!monitor_specs && laptop_monitor_spec)
{
monitor_specs =
g_list_prepend (NULL, meta_monitor_spec_clone (laptop_monitor_spec));
}
if (!monitor_specs)
return NULL;