From 34fcbdb3c0c4c8467547cd935c98472306d1e78f Mon Sep 17 00:00:00 2001
From: Thomas Farstrike <111072251+ThomasFarstrike@users.noreply.github.com>
Date: Fri, 27 Feb 2026 15:33:57 +0100
Subject: [PATCH] display_driver_framework.py: reduce backlight PWM frequency

The 38kHz frequency for the display backlight was causing issues on QEMU because QEMU had trouble accurately timing that high of a frequency, causing it to "miss" some of the signal, causing it to never go fully 100% bright.

As the human eye's refresh rate is far lower, and the LilyGo example code I checked uses just 1kHz, I figured 3.8kHz would still be plenty fast.

Presumably, a lower PWM output speed is also good for EMF radiation and power consumption, so why not :-)
---
 .../py_api_drivers/frozen/display/display_driver_framework.py   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api_drivers/py_api_drivers/frozen/display/display_driver_framework.py b/api_drivers/py_api_drivers/frozen/display/display_driver_framework.py
index 52616ade..c9fa189d 100644
--- a/api_drivers/py_api_drivers/frozen/display/display_driver_framework.py
+++ b/api_drivers/py_api_drivers/frozen/display/display_driver_framework.py
@@ -173,7 +173,7 @@ def __init__(
                     backlight_on_state = STATE_HIGH
                 else:
                     self._backlight_pin = machine.PWM(
-                        self._backlight_pin, freq=38000)
+                        self._backlight_pin, freq=3800)
 
             if (
                 backlight_on_state != STATE_PWM and