From 97bf063f32205372aeacdf4cea240653d24b966e Mon Sep 17 00:00:00 2001
From: Oleg Broytman <phd@phdru.name>
Date: Thu, 4 Dec 2025 22:00:05 +0300
Subject: [PATCH] Feat(admin/prog/acpi/LCD): Limit low bound

---
 admin/prog/acpi/LCD | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/admin/prog/acpi/LCD b/admin/prog/acpi/LCD
index 23f6a2f..918be75 100755
--- a/admin/prog/acpi/LCD
+++ b/admin/prog/acpi/LCD
@@ -1,9 +1,10 @@
 #!/bin/sh -e
 
 current=`cat /sys/class/backlight/intel_backlight/brightness`
+max=`cat /sys/class/backlight/intel_backlight/max_brightness`
 
 if [ -z "$1" -o -n "$2" ]; then
-   echo "Usage: $0 brightness [0-`cat /sys/class/backlight/intel_backlight/max_brightness`]" >&2
+   echo "Usage: $0 brightness [10000-$max]" >&2
    echo "Current: $current"
    exit 1
 fi
@@ -18,5 +19,10 @@ case "$1" in
     *) new="$1" ;;
 esac
 
+if [ "$new" -lt 10000 -o "$new" -gt $max]; then
+   echo "Usage: $0 brightness [10000-$max]" >&2
+   exit 1
+fi
+
 echo "$new" |
     sudo tee /sys/class/backlight/intel_backlight/brightness >/dev/null
-- 
2.39.5