* connector is linked to. Drivers should never set this property directly,
* it is handled by the DRM core by calling the &drm_connector_funcs.dpms
* callback. For atomic drivers the remapping to the "ACTIVE" property is
- * implemented in the DRM core. This is the only standard connector
- * property that userspace can change.
+ * implemented in the DRM core.
*
* Note that this property cannot be set through the MODE_ATOMIC ioctl,
* userspace must use "ACTIVE" on the CRTC instead.
* after modeset, the kernel driver may set this to "BAD" and issue a
* hotplug uevent. Drivers should update this value using
* drm_connector_set_link_status_property().
+ *
+ * When user-space receives the hotplug uevent and detects a "BAD"
+ * link-status, the sink doesn't receive pixels anymore (e.g. the screen
+ * becomes completely black). The list of available modes may have
+ * changed. User-space is expected to pick a new mode if the current one
+ * has disappeared and perform a new modeset with link-status set to
+ * "GOOD" to re-enable the connector.
+ *
+ * If multiple connectors share the same CRTC and one of them gets a "BAD"
+ * link-status, the other are unaffected (ie. the sinks still continue to
+ * receive pixels).
+ *
+ * When user-space performs an atomic commit on a connector with a "BAD"
+ * link-status without resetting the property to "GOOD", the sink may
+ * still not receive pixels. When user-space performs an atomic commit
+ * which resets the link-status property to "GOOD" without the
+ * ALLOW_MODESET flag set, it might fail because a modeset is required.
+ *
+ * User-space can only change link-status to "GOOD", changing it to "BAD"
+ * is a no-op.
+ *
+ * For backwards compatibility with non-atomic userspace the kernel
+ * tries to automatically set the link-status back to "GOOD" in the
+ * SETCRTC IOCTL. This might fail if the mode is no longer valid, similar
+ * to how it might fail if a different screen has been connected in the
+ * interim.
* non_desktop:
* Indicates the output should be ignored for purposes of displaying a
* standard desktop environment or console. This is most likely because