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-rw-r--r--src/backlight/backlight.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c
index 754a646c3d..c708391612 100644
--- a/src/backlight/backlight.c
+++ b/src/backlight/backlight.c
@@ -205,14 +205,18 @@ static unsigned get_max_brightness(struct udev_device *device) {
max_brightness_str = udev_device_get_sysattr_value(device, "max_brightness");
if (!max_brightness_str) {
- log_warning("Failed to read 'max_brightness' attribute");
+ log_warning("Failed to read 'max_brightness' attribute.");
return 0;
}
r = safe_atou(max_brightness_str, &max_brightness);
if (r < 0) {
- log_warning("Failed to parse 'max_brightness' \"%s\": %s",
- max_brightness_str, strerror(-r));
+ log_warning("Failed to parse 'max_brightness' \"%s\": %s", max_brightness_str, strerror(-r));
+ return 0;
+ }
+
+ if (max_brightness <= 0) {
+ log_warning("Maximum brightness is 0, ignoring device.");
return 0;
}