diff options
| -rw-r--r-- | backend/drm/backend.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/backend/drm/backend.c b/backend/drm/backend.c index 1492c4d4..d061272d 100644 --- a/backend/drm/backend.c +++ b/backend/drm/backend.c @@ -103,6 +103,21 @@ static void handle_session_active(struct wl_listener *listener, void *data) { wlr_log(WLR_INFO, "DRM fd resumed"); scan_drm_connectors(drm, NULL); + // The previous DRM master leaves KMS in an undefined state. We need + // to restore out own state, but be careful to avoid invalid + // configurations. The connector/CRTC mapping may have changed, so + // first disable all CRTCs, then light up the ones we were using + // before the VT switch. + // TODO: use the atomic API to improve restoration after a VT switch + for (size_t i = 0; i < drm->num_crtcs; i++) { + struct wlr_drm_crtc *crtc = &drm->crtcs[i]; + + if (drmModeSetCrtc(drm->fd, crtc->id, 0, 0, 0, NULL, 0, NULL) != 0) { + wlr_log_errno(WLR_ERROR, "Failed to disable CRTC %"PRIu32" after VT switch", + crtc->id); + } + } + struct wlr_drm_connector *conn; wl_list_for_each(conn, &drm->connectors, link) { struct wlr_output_mode *mode = NULL; |