Add backlight control shortcuts

config.def.h

@@ -63,6 +63,8 @@ static const Layout layouts[] = {
 static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn() */
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
 static const char *termcmd[]  = { "st", NULL };
+static const char *backlightinccmd[]  = { "xbacklight", "-inc", "5", NULL };
+static const char *backlightdeccmd[]  = { "xbacklight", "-dec", "5", NULL };
 static const char *volup[]  = { "volcont", "--up", NULL };
 static const char *voldown[]  = { "volcont", "--down", "5", NULL };
 static const char *voltog[]  = { "volcont", "--toggle", "5", NULL };
@@ -74,6 +76,8 @@ static Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_r,      spawn,          {.v = dmenucmd } },
 	{ MODKEY,                       XK_Return, spawn,          {.v = termcmd } },
+	{ 0,                            0x1008ff02,spawn,          {.v = backlightinccmd } },
+	{ 0,                            0x1008ff03,spawn,          {.v = backlightdeccmd } },
 	{ 0,                            0x1008ff13,spawn,          {.v = volup } },
 	{ 0,                            0x1008ff11,spawn,          {.v = voldown } },
 	{ 0,                            0x1008ff12,spawn,          {.v = voltog } },