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backend/drm: don't modeset with a NULL mode after TTY switch
This fixes a segfault in drm_connector_set_mode (mode = NULL). This happens because we set wlr_output.enabled to true if the connector is attached to the CRTC. When the user disables an output in the wlroots-based compositor, switches to another VT (enabling the output), then switches back, wlroots sets wlr_output.enabled to true but wlr_output.current_mode is NULL. We should consider not reading properties from KMS after a TTY switch, disabling all connectors. However this may result in flickering (outputs being disabled then re-enabled). Closes: https://github.com/swaywm/wlroots/issues/1874
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2 changed files with 3 additions and 1 deletions
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@ -93,7 +93,7 @@ static void session_signal(struct wl_listener *listener, void *data) {
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struct wlr_drm_connector *conn;
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wl_list_for_each(conn, &drm->outputs, link){
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if (conn->output.enabled) {
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if (conn->output.enabled && conn->output.current_mode != NULL) {
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drm_connector_set_mode(&conn->output,
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conn->output.current_mode);
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} else {
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@ -1439,6 +1439,8 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
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wlr_conn->output.name);
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}
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// TODO: this results in connectors being enabled without a mode
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// set
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wlr_output_update_enabled(&wlr_conn->output, wlr_conn->crtc != NULL);
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wlr_conn->desired_enabled = true;
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