The instance name is never escaped in the udev rule, but unescaped in the unit.
This results in the following error message on Asus boards:

  Failed to get backlight or LED device 'backlight:eeepc/wmi': No such file or 
directory
---
 units/systemd-backli...@.service.in | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/units/systemd-backli...@.service.in 
b/units/systemd-backli...@.service.in
index 5caa5d5..e945d87 100644
--- a/units/systemd-backli...@.service.in
+++ b/units/systemd-backli...@.service.in
@@ -6,7 +6,7 @@
 #  (at your option) any later version.
 
 [Unit]
-Description=Load/Save Screen Backlight Brightness of %I
+Description=Load/Save Screen Backlight Brightness of %i
 Documentation=man:systemd-backlight@.service(8)
 DefaultDependencies=no
 RequiresMountsFor=/var/lib/systemd/backlight
@@ -17,5 +17,5 @@ Before=sysinit.target shutdown.target
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStart=@rootlibexecdir@/systemd-backlight load %I
-ExecStop=@rootlibexecdir@/systemd-backlight save %I
+ExecStart=@rootlibexecdir@/systemd-backlight load %i
+ExecStop=@rootlibexecdir@/systemd-backlight save %i
-- 
1.9.0

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