core: make errors on reading experimental options from config less scary.

The config file is written poorly: first off, not all available options
are written (they have to be written manually, since there's no struct
enumeration); then, default values are not commented out.

driver-opencl.c

@@ -567,6 +567,7 @@ char *set_intensity(char *arg)
 	else {
 		gpus[device].dynamic = false;
 		val = atoi(nextptr);
+		if (val == 0) return "disabled";
 		if (val < MIN_INTENSITY || val > MAX_INTENSITY)
 			return "Invalid value passed to set intensity";
 		tt = &gpus[device].intensity;
@@ -583,6 +584,7 @@ char *set_intensity(char *arg)
 		else {
 			gpus[device].dynamic = false;
 			val = atoi(nextptr);
+			if (val == 0) return "disabled";
 			if (val < MIN_INTENSITY || val > MAX_INTENSITY)
 				return "Invalid value passed to set intensity";
 
@@ -614,6 +616,7 @@ char *set_xintensity(char *arg)
 	if (nextptr == NULL)
 		return "Invalid parameters for shader based intensity";
 	val = atoi(nextptr);
+	if (val == 0) return "disabled";
 	if (val < MIN_XINTENSITY || val > MAX_XINTENSITY)
 		return "Invalid value passed to set shader-based intensity";
 
@@ -625,6 +628,7 @@ char *set_xintensity(char *arg)
 
 	while ((nextptr = strtok(NULL, ",")) != NULL) {
 		val = atoi(nextptr);
+		if (val == 0) return "disabled";
 		if (val < MIN_XINTENSITY || val > MAX_XINTENSITY)
 			return "Invalid value passed to set shader based intensity";
 		gpus[device].dynamic = false; // Disable dynamic intensity
@@ -653,6 +657,7 @@ char *set_rawintensity(char *arg)
 	if (nextptr == NULL)
 		return "Invalid parameters for raw intensity";
 	val = atoi(nextptr);
+	if (val == 0) return "disabled";
 	if (val < MIN_RAWINTENSITY || val > MAX_RAWINTENSITY)
 		return "Invalid value passed to set raw intensity";
 
@@ -664,6 +669,7 @@ char *set_rawintensity(char *arg)
 
 	while ((nextptr = strtok(NULL, ",")) != NULL) {
 		val = atoi(nextptr);
+		if (val == 0) return "disabled";
 		if (val < MIN_RAWINTENSITY || val > MAX_RAWINTENSITY)
 			return "Invalid value passed to set raw intensity";
 		gpus[device].dynamic = false; // Disable dynamic intensity

sgminer.c

@@ -1412,10 +1412,10 @@ static char *parse_config(json_t *config, bool fileconf, int parent_iteration)
 				 * file, just skipping over them provided the
 				 * JSON is still valid after that. */
 				if (fileconf) {
-					applog(LOG_ERR, "Invalid config option %s: %s", p, err);
+					applog(LOG_WARNING, "Skipping config option %s: %s", p, err);
 					fileconf_load = -1;
 				} else {
-					snprintf(err_buf, sizeof(err_buf), "Parsing JSON option %s: %s",
+					snprintf(err_buf, sizeof(err_buf), "Error parsing JSON option %s: %s",
 						p, err);
 					return err_buf;
 				}