On the Dell Inspiron 1520 both the atkbd and acpi-video input devices report
an event for pressing the brightness up / down key-combos, resulting in user
space seeing double events and increasing / decreasing the brightness 2 steps
for each keypress.
This hwdb snippet suppresses the atkbd events, making the Inspiron 1520 work
like most modern laptops which emit brightness up / down events through
acpi-video only.
Reported by Pavel Malyshev <p.malishev@gmail.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1141525
keyboard:dmi:bvn*:bvr*:bd*:svnDell*:pnInspiron*1210:pvr*
KEYBOARD_KEY_84=wlan
+# Dell Inspiron 1520
+keyboard:dmi:bvn*:bvr*:bd*:svnDell*:pnInspiron*1520:pvr*
+ KEYBOARD_KEY_85=unknown # Brightness Down, also emitted by acpi-video, ignore
+ KEYBOARD_KEY_86=unknown # Brightness Up, also emitted by acpi-video, ignore
+
# Latitude XT2
keyboard:dmi:bvn*:bvr*:bd*:svnDell*:pnLatitude*XT2:pvr*
KEYBOARD_KEY_9b=up # tablet rocker up