Use the gpu_fan set value as the starting fan speed.

Don't try and change the value if get() doesn't match as it's unreliable, just save the reentrant value.
Limit fanspeeds to reported iMax and iMin.

adl.c

@@ -324,7 +324,7 @@ void init_adl(int nDevs)
 		if (opt_autofan) {
 			ga->autofan = true;
 			/* Set a safe starting default if we're automanaging fan speeds */
-			set_fanspeed(gpu, 85);
+			set_fanspeed(gpu, gpus[gpu].gpu_fan);
 			ga->managed = true;
 		}
 		if (opt_autoengine) {
@@ -828,10 +828,12 @@ void gpu_autotune(int gpu, bool *enable)
 	if (temp && fanpercent >= 0 && ga->autofan) {
 		int top = gpus[gpu].gpu_fan;
 		int bot = gpus[gpu].min_fan;
+		int iMin = 0, iMax = 100;
 
-		if (temp > ga->overtemp && fanpercent < 100) {
+		get_fanrange(gpu, &iMin, &iMax);
+		if (temp > ga->overtemp && fanpercent < iMax) {
 			applog(LOG_WARNING, "Overheat detected on GPU %d, increasing fan to 100%", gpu);
-			newpercent = 100;
+			newpercent = iMax;
 		} else if (temp > ga->targettemp && fanpercent < top) {
 			if (opt_debug)
 				applog(LOG_DEBUG, "Temperature over target, increasing fanspeed");
@@ -847,23 +849,14 @@ void gpu_autotune(int gpu, bool *enable)
 			newpercent = ga->targetfan - 1;
 		}
 
-		if (newpercent > 100)
-			newpercent = 100;
-		else if (newpercent < 0)
-			newpercent = 0;
+		if (newpercent > iMax)
+			newpercent = iMax;
+		else if (newpercent < iMin)
+			newpercent = iMin;
 		if (newpercent != fanpercent) {
 			fan_optimal = false;
 			applog(LOG_INFO, "Setting GPU %d fan percentage to %d", gpu, newpercent);
 			set_fanspeed(gpu, newpercent);
-			if (newpercent > fanpercent) {
-				int changefan = gpu_fanspeed(gpu);
-
-				if (changefan < newpercent) {
-					newpercent += 10;
-					newpercent -= newpercent % 10;
-					set_fanspeed(gpu, newpercent);
-				}
-			}
 		}
 	}