X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbacklight%2Fbacklight.c;h=c79ad6520c9f8668f0992c51d7506790f23e8726;hb=30ae637af31551f6c3d8f27db4537aaddda462bb;hp=2f1b3b2f9c6559c548a8d1ef58bf369814b3dbb0;hpb=da927ba997d68401563b927f92e6e40e021a8e5c;p=elogind.git

diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c
index 2f1b3b2f9..c79ad6520 100644
--- a/src/backlight/backlight.c
+++ b/src/backlight/backlight.c
@@ -285,8 +285,7 @@ int main(int argc, char *argv[]) {
 
         r = mkdir_p("/var/lib/systemd/backlight", 0755);
         if (r < 0) {
-                log_error("Failed to create backlight directory /var/lib/systemd/backlight: %s",
-                          strerror(-r));
+                log_error_errno(r, "Failed to create backlight directory /var/lib/systemd/backlight: %m");
                 return EXIT_FAILURE;
         }
 
@@ -319,7 +318,7 @@ int main(int argc, char *argv[]) {
         device = udev_device_new_from_subsystem_sysname(udev, ss, sysname);
         if (!device) {
                 if (errno != 0)
-                        log_error("Failed to get backlight or LED device '%s:%s': %m", ss, sysname);
+                        log_error_errno(errno, "Failed to get backlight or LED device '%s:%s': %m", ss, sysname);
                 else
                         log_oom();
 
@@ -374,6 +373,7 @@ int main(int argc, char *argv[]) {
 
         if (streq(argv[1], "load")) {
                 _cleanup_free_ char *value = NULL;
+                const char *clamp;
 
                 if (!shall_restore_state())
                         return EXIT_SUCCESS;
@@ -391,12 +391,13 @@ int main(int argc, char *argv[]) {
                         return EXIT_FAILURE;
                 }
 
-                clamp_brightness(device, &value, max_brightness);
+                clamp = udev_device_get_property_value(device, "ID_BACKLIGHT_CLAMP");
+                if (!clamp || parse_boolean(clamp) != 0) /* default to clamping */
+                        clamp_brightness(device, &value, max_brightness);
 
                 r = udev_device_set_sysattr_value(device, "brightness", value);
                 if (r < 0) {
-                        log_error("Failed to write system 'brightness' attribute: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Failed to write system 'brightness' attribute: %m");
                         return EXIT_FAILURE;
                 }