I modified libxrandr to return the actual error code returned from
XRRSetCrtcConfig():

--- libxrandr-1.5.1.orig/src/XrrCrtc.c
+++ libxrandr-1.5.1/src/XrrCrtc.c
@@ -155,9 +155,10 @@ XRRSetCrtcConfig (Display *dpy,
     req->mode = mode;
     req->rotation = rotation;
     Data32 (dpy, outputs, noutputs << 2);
+    int ret_code = _XReply (dpy, (xReply *) &rep, 0, xFalse);
+    if (ret_code != 0)
+        rep.status = ret_code;
 
-    if (!_XReply (dpy, (xReply *) &rep, 0, xFalse))
-       rep.status = RRSetConfigFailed;
     UnlockDisplay (dpy);
     SyncHandle ();
     return rep.status;


And it shows:

xfce4-settings(displays): Configuring CRTC 79.
xfce4-settings(displays): Applying changes to CRTC 79.
xfce4-settings(displays): Applying CRTC 79 Transform: x=0.000000 y=0.000000, 
filter=bilinear.

(xfsettingsd:7726): xfsettingsd-WARNING **: 12:44:13.650:
XRRSetCrtcConfig()=1, sleeping

(xfsettingsd:7726): xfsettingsd-WARNING **: 12:44:13.655:
XRRSetCrtcConfig()=1, sleeping

(xfsettingsd:7726): xfsettingsd-WARNING **: 12:44:13.657:
XRRSetCrtcConfig()=1, sleeping

(xfsettingsd:7726): xfsettingsd-WARNING **: 12:44:13.658:
XRRSetCrtcConfig()=1, sleeping

(xfsettingsd:7726): xfsettingsd-WARNING **: 12:44:13.660:
XRRSetCrtcConfig()=1, sleeping

(xfsettingsd:7726): xfsettingsd-WARNING **: 12:44:13.661: Failed to configure 
CRTC 79 XRRSetCrtcConfig()=1.
xfce4-settings(displays): Configuring CRTC 80.

(xfsettingsd:7726): xfsettingsd-CRITICAL **: 12:44:13.662: Failed to apply 
display settings
xfce4-settings(displays): RRScreenChangeNotify event received.

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https://bugs.launchpad.net/bugs/1759950

Title:
  Lid-close suspend: blank screen when switching to user session

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