--- a/pers-init.el	Tue Nov 28 11:08:51 2017 +0000
+++ b/pers-init.el	Wed May 16 15:40:47 2018 +0100
@@ -420,30 +420,39 @@
   (site-caseq (laptop
 	       (message (format "pw: %s" (device-pixel-width (selected-device))))))
   (if (fboundp 'device-pixel-width)
-      (let ((pw (device-pixel-width (selected-device))))
+      (let ((pw (device-pixel-width (selected-device)))
+	    (ph (device-pixel-height (selected-device))))
 	(cond ((>= pw 1680)
 	       ;; we're on a big external monitor
+	       (require 'font-menu)
+	       (font-menu-set-font nil nil 10)
 	       (set-frame-pixel-size (selected-frame) 900 960)
-	       (set-frame-position (selected-frame) -3 -20)
-	       ((= (device-pixel-height (selected-device)) 768)
-		;; we're on a narrow cinema-ratio laptop
-		(set-frame-pixel-size (selected-frame) 690 710)
-		(set-frame-position (selected-frame) -5 -26))
-	       ((= (device-pixel-height (selected-device)) 900)
-		;; we're on a cinema-ratio laptop
-		(set-frame-pixel-size (selected-frame) 800 820)
-		(set-frame-position (selected-frame) -3 -20))
-	       ((= pw 1600)
-		;; we're on a big external monitor
-		(set-frame-pixel-size (selected-frame) 900 1120)
-		(set-frame-position (selected-frame) -3 -20))
-	       ((= pw 1280)
-		(cond ((eq (device-pixel-height) 720)
-		       (set-frame-pixel-size (selected-frame) 700 655)
-		       (set-frame-position (selected-frame) -3 -30))
-		      (t
-		       (set-frame-pixel-size (selected-frame) 700 960)
-		       (set-frame-position (selected-frame) -3 -20)))))))))
+	       (set-frame-position (selected-frame) -3 -20))
+	      ((= pw 1097)
+	       ;; we're on an XPS 13
+	       (require 'font-menu)
+	       (font-menu-set-font nil nil 9)
+	       (set-frame-pixel-size (selected-frame) 583 583); 39 x 80
+	       (set-frame-position (selected-frame) -5 -26))
+	      ((= ph 768)
+	       ;; we're on a narrow cinema-ratio laptop
+	       (set-frame-pixel-size (selected-frame) 690 710)
+	       (set-frame-position (selected-frame) -5 -26))
+	      ((= ph 900)
+	       ;; we're on a cinema-ratio laptop
+	       (set-frame-pixel-size (selected-frame) 800 820)
+	       (set-frame-position (selected-frame) -3 -20))
+	      ((= pw 1600)
+	       ;; we're on a big external monitor
+	       (set-frame-pixel-size (selected-frame) 900 1120)
+	       (set-frame-position (selected-frame) -3 -20))
+	      ((= pw 1280)
+	       (cond ((= ph 720)
+		      (set-frame-pixel-size (selected-frame) 700 655)
+		      (set-frame-position (selected-frame) -3 -30))
+		     (t
+		      (set-frame-pixel-size (selected-frame) 700 960)
+		      (set-frame-position (selected-frame) -3 -20))))))))
 
 (ht-custom-size)