Quoting Stanislav Lisovskiy (2018-11-28 13:52:10) > Currently kernel might allocate different connector ids > for the same outputs in case of DP MST, which seems to > confuse userspace. There are can be different connector > ids in the list, which could be assigned to the same > output, while being in different states. > This results in issues, like external displays staying > blank after quick unplugging and plugging back(bug #106250). > Returning only active DP connectors fixes the issue. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106250 > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx> > --- > drivers/gpu/drm/drm_mode_config.c | 16 +++++++++++----- > 1 file changed, 11 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c > index ee80788f2c40..ec5b2b08a45e 100644 > --- a/drivers/gpu/drm/drm_mode_config.c > +++ b/drivers/gpu/drm/drm_mode_config.c > @@ -143,6 +143,7 @@ int drm_mode_getresources(struct drm_device *dev, void *data, > drm_connector_list_iter_begin(dev, &conn_iter); > count = 0; > connector_id = u64_to_user_ptr(card_res->connector_id_ptr); > + DRM_DEBUG_KMS("GetResources: writing connectors start"); > drm_for_each_connector_iter(connector, &conn_iter) { > /* only expose writeback connectors if userspace understands them */ > if (!file_priv->writeback_connectors && > @@ -150,15 +151,20 @@ int drm_mode_getresources(struct drm_device *dev, void *data, > continue; if (READ_ONCE(connector->registration_state) != DRM_CONNECTOR_REGISTERED) continue; > > if (drm_lease_held(file_priv, connector->base.id)) {
