diff --git a/components/driver/test/test_ledc.c b/components/driver/test/test_ledc.c
index 4888f5464b..96604ceab2 100644
--- a/components/driver/test/test_ledc.c
+++ b/components/driver/test/test_ledc.c
@@ -260,11 +260,11 @@ TEST_CASE("LEDC set and get frequency", "[ledc][test_env=UT_T1_LEDC][timeout=60]
     timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_1, LEDC_HIGH_SPEED_MODE);
     timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_2, LEDC_HIGH_SPEED_MODE);
     timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_3, LEDC_HIGH_SPEED_MODE);
-//    comment it because this is a bug that when ledc in low speed mode, its frequency can't be changed
-//    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_0, LEDC_LOW_SPEED_MODE);
-//    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_1, LEDC_LOW_SPEED_MODE);
-//    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_2, LEDC_LOW_SPEED_MODE);
-//    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_3, LEDC_LOW_SPEED_MODE);
+
+    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_0, LEDC_LOW_SPEED_MODE);
+    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_1, LEDC_LOW_SPEED_MODE);
+    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_2, LEDC_LOW_SPEED_MODE);
+    timer_frequency_test(LEDC_CHANNEL_0, LEDC_TIMER_13_BIT, LEDC_TIMER_3, LEDC_LOW_SPEED_MODE);
 }
 
 // the duty need to be detected by waveform given by the logic analyzer