diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52b6a84a..94942ddb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Convert fan curve percentage to 0-255 expected by kernel driver only if '%' char is used, otherwise the expected range for fan power is 0-255
+### Added
+- LED modes for G513QR
 
 # [4.0.4] - 2021-10-02
 ### Changed
diff --git a/asusctl/src/profiles_cli.rs b/asusctl/src/profiles_cli.rs
index 06c7d488..1d53c7c8 100644
--- a/asusctl/src/profiles_cli.rs
+++ b/asusctl/src/profiles_cli.rs
@@ -44,7 +44,8 @@ pub struct FanCurveCommand {
 
     #[options(
         meta = "",
-        help = "data format = 30c:1%,49c:2%,59c:3%,69c:4%,79c:31%,89c:49%,99c:56%,109c:58%. `mod-profile` required"
+        help = "data format = 30c:1%,49c:2%,59c:3%,69c:4%,79c:31%,89c:49%,99c:56%,109c:58%.
+                      `--mod-profile` required. If '%' is omitted the fan range is 0-255"
     )]
     pub data: Option<CurveData>,
 }
diff --git a/rog-profiles/src/error.rs b/rog-profiles/src/error.rs
index 6980e904..2ead72b8 100644
--- a/rog-profiles/src/error.rs
+++ b/rog-profiles/src/error.rs
@@ -12,6 +12,7 @@ pub enum ProfileError {
     ParseFanCurveDigit(std::num::ParseIntError),
     /// (pwm/temp, prev, next)
     ParseFanCurvePrevHigher(&'static str, u8, u8),
+    ParseFanCurvePercentOver100(u8),
     // Zbus(zbus::Error),
 }
 
@@ -34,6 +35,9 @@ impl fmt::Display for ProfileError {
                 "Invalid {}, previous value {} is higher than next value {}",
                 part, prev, next
             ),
+            ProfileError::ParseFanCurvePercentOver100(value) => {
+                write!(f, "Invalid percentage, {} is higher than 100", value)
+            }
             // Error::Zbus(detail) => write!(f, "Zbus error: {}", detail),
         }
     }
diff --git a/rog-profiles/src/fan_curve_set.rs b/rog-profiles/src/fan_curve_set.rs
index 1096cab2..3d6e97f2 100644
--- a/rog-profiles/src/fan_curve_set.rs
+++ b/rog-profiles/src/fan_curve_set.rs
@@ -37,14 +37,24 @@ pub struct CurveData {
 impl std::str::FromStr for CurveData {
     type Err = ProfileError;
 
+    /// Parse a string to the correct values that the fan curve kernel driver expects
+    ///
+    /// If the fan curve is given with percentage char '%' then the fan power values are converted
+    /// otherwise the expected fan power range is 0-255.
+    ///
+    /// Temperature range is 0-255 in degrees C. You don't want to be setting over 100.
     fn from_str(input: &str) -> Result<Self, Self::Err> {
         let mut temp = [0u8; 8];
         let mut pwm = [0u8; 8];
         let mut temp_prev = 0;
         let mut pwm_prev = 0;
+        let mut percentages = false;
 
         for (index, value) in input.split(',').enumerate() {
             for (select, num) in value.splitn(2, |c| c == 'c' || c == ':').enumerate() {
+                if num.contains('%') {
+                    percentages = true;
+                }
                 let r = num.trim_matches(|c| c == 'c' || c == ':' || c == '%');
                 let r = r.parse::<u8>().map_err(ProfileError::ParseFanCurveDigit)?;
 
@@ -59,15 +69,22 @@ impl std::str::FromStr for CurveData {
                     temp_prev = r;
                     temp[index] = r;
                 } else {
-                    if pwm_prev > r {
+                    let mut p = r;
+                    if percentages {
+                        p *= 255 / 100;
+                        if p > 100 {
+                            return Err(ProfileError::ParseFanCurvePercentOver100(r));
+                        }
+                    }
+                    if pwm_prev > p {
                         return Err(ProfileError::ParseFanCurvePrevHigher(
                             "percentage",
                             pwm_prev,
-                            r,
+                            p,
                         ));
                     }
-                    pwm_prev = r;
-                    pwm[index] = r;
+                    pwm_prev = p;
+                    pwm[index] = p;
                 }
             }
         }