https://github.com/systemd/systemd/issues/15360

The additional rules fix a firmware bug in the en keyboard of Librem notebooks by Purism.

By doing so the break the keyboard with other layouts which do not have the same bug in their firmware.

hwdb.d/60-keyboard.hwdb

@@ -1463,17 +1463,29 @@ evdev:input:b0003v047FpC006*
 # Purism
 ###########################################################
 
-# Purism Librem 13 V2
-evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v2*:*
- KEYBOARD_KEY_56=backslash
-
-# Purism Librem 13 V3
-evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v3*:*
- KEYBOARD_KEY_56=backslash
-
-# Purism Librem 13 V4
-evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v4*:*
- KEYBOARD_KEY_56=backslash
+# If you're using an us layout keyboard in one of the below models of 
+# Purism Librem 13 consider copying this file to /etc/systemd/hwdb.d/
+# to enable the following rule acording to your model.
+#
+# There's a bug in the keyboards firmware and the additional rule
+# will make your keyboard behave as expected.
+# 
+# More info:
+# - https://github.com/systemd/systemd/issues/15360
+# - https://github.com/systemd/systemd/pull/11516
+# - https://tracker.pureos.net/T888
+# 
+# # Purism Librem 13 V2
+# evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v2*:*
+#  KEYBOARD_KEY_56=backslash
+# 
+# # Purism Librem 13 V3
+# evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v3*:*
+#  KEYBOARD_KEY_56=backslash
+# 
+# # Purism Librem 13 V4
+# evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v4*:*
+#  KEYBOARD_KEY_56=backslash
 
 ###########################################################
 # Quanta