D26692.diff
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	Index: head/usr.bin/backlight/backlight.8
	===================================================================
	--- head/usr.bin/backlight/backlight.8
	+++ head/usr.bin/backlight/backlight.8
	@@ -22,7 +22,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd October 02, 2020
	+.Dd October 06, 2020
	.Dt BACKLIGHT 8
	.Os
	.Sh NAME
	@@ -63,6 +63,7 @@
	Query information about the backlight (name, type).
	.It Ar value
	Set the brightness level to this value, must be between 0 and 100.
	+A trailing '%' is valid.
	.It Ar incr \| +
	.Op Ar value
	Decrement the backlight level.
	Index: head/usr.bin/backlight/backlight.c
	===================================================================
	--- head/usr.bin/backlight/backlight.c
	+++ head/usr.bin/backlight/backlight.c
	@@ -144,6 +144,9 @@
	action = BACKLIGHT_SET_BRIGHTNESS;

	if (argc == 1) {
	+ /* ignore a trailing % for user friendlyness */
	+ if (argv[0][strlen(argv[0]) - 1] == '%')
	+ argv[0][strlen(argv[0]) - 1] = '\0';
	percent = strtonum(argv[0], 0, 100, &percent_error);
	if (percent_error)
	errx(1, "Cannot parse brightness level %s: %s",