Document known issue

Closes #17787

wiki/src/support/known_issues.mdwn

@@ -314,6 +314,15 @@ Specs: https://www.cnet.com/products/lenovo-ideapad-z585-15-6-a8-4500m-6-gb-ram-
 
 Goes back continuously to Boot Loader on Tails installed on DVD.
 
+### Microsoft Surface Laptop 3
+
+<!--
+Last updated: 2020-07-03
+-->
+
+The keyboard and mouse do not work on this laptop.
+If you find a workaround, please let us know.
+
 ### Clevo W258CU, ThinkPad X121e, T420i, T410, T520, W520, T530, T60, E325, and E530
 
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