diff --git a/platformio.ini b/platformio.ini
index 873d9a08..8ed83df6 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -34,6 +34,9 @@ upload_speed = 921600
 lib_deps_all =
 lib_deps_display =
 ;   U8g2@>=2.23.12
+; U8g2 library stored local to tweak i2c display speed down to 100khz
+; speed 400khz causes interrupt injection error with espressif32 core v1.1.x
+; will be removed again after bug in espressif32 core is solved
 lib_deps_rgbled =
     SmartLeds@>=1.1.3
 lib_deps_gps =
@@ -44,8 +47,8 @@ build_flags =
 ; otherwise device may crash in dense environments due to serial buffer overflow
 ;
 ; -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_NONE
-; -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_INFO
-  -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
+ -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_INFO
+; -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
 ; -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_VERBOSE
 ;
 ; override lora settings from LMiC library in lmic/config.h and use main.h instead