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backlight: warn if kernel exposes backlight device with bogus max_brightness

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We shouldn't silently tape over broken kernel drivers.
This commit is contained in:
Lennart Poettering
2014-04-23 19:06:38 +02:00
parent e30fa16e27
commit c7fdf44d08
1 changed files with 7 additions and 3 deletions
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src/backlight/backlight.c
+7 -3
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@@ -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;
}