From 1f1d2f190dc5a2f8c2d4041fe8a9338f466e28f3 Mon Sep 17 00:00:00 2001
From: Jean Delvare <khali@linux-fr.org>
Date: Fri, 27 Apr 2007 13:37:07 +0000
Subject: [PATCH] pwmconfig: Use smaller steps for low PWM values. Inspired
 from a patch from the openSuse sensors package. This is a good idea because
 the PWM/speed relation isn't linear, and it is frequent that the speed
 changes are concentrated in the low PWM range.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4380 7894878c-1315-0410-8ee3-d5d059ff63e0
---
 CHANGES            |  1 +
 prog/pwm/pwmconfig | 11 ++++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 9f0c73b8..23b3a78d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -8,6 +8,7 @@ SVN HEAD
            Add dme1737 support
   Man page sensors.conf.5: Update the chip statement section
   Program isadump: Detect when address bit 7 is a busy flag
+  Program pwmconfig: Use smaller steps for low PWM values
   Program rrd: Support non-i2c devices (hwmon class)
                Add missing shell declarations
                Update URI
diff --git a/prog/pwm/pwmconfig b/prog/pwm/pwmconfig
index 6217d594..c9140713 100755
--- a/prog/pwm/pwmconfig
+++ b/prog/pwm/pwmconfig
@@ -248,6 +248,10 @@ echo
 PLOTTER=gnuplot
 STEP=15
 PDELAY=2
+# Use a smaller step for low PWM values as this is typically where the
+# more important fan speed changes are happening.
+STEP2=2
+STEP2_BELOW=31
 
 function pwmdetail()
 {
@@ -315,7 +319,12 @@ function pwmdetail()
 			fi
 			break
 		fi
-		let pwm=$pwm-$STEP
+		if [ $pwm -lt $STEP2_BELOW ]
+		then
+			let pwm=$pwm-$STEP2
+		else
+			let pwm=$pwm-$STEP
+		fi
 	done
 	pwmdisable $P	
 	if [ "$PLOT" = "y" ]