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-rw-r--r--keyboards/converter/siemens_tastatur/rules.mk3
1 files changed, 3 insertions, 0 deletions
diff --git a/keyboards/converter/siemens_tastatur/rules.mk b/keyboards/converter/siemens_tastatur/rules.mk
index bc0ed53165..bc5875962b 100644
--- a/keyboards/converter/siemens_tastatur/rules.mk
+++ b/keyboards/converter/siemens_tastatur/rules.mk
@@ -22,3 +22,6 @@ BACKLIGHT_ENABLE = no
RGBLIGHT_ENABLE = no
CUSTOM_MATRIX = yes
+
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE