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-rw-r--r--keyboards/at_at/660m/rules.mk3
1 files changed, 3 insertions, 0 deletions
diff --git a/keyboards/at_at/660m/rules.mk b/keyboards/at_at/660m/rules.mk
index b893d8031b..0b3685f09e 100644
--- a/keyboards/at_at/660m/rules.mk
+++ b/keyboards/at_at/660m/rules.mk
@@ -17,3 +17,6 @@ CUSTOM_MATRIX = no # Custom matrix file
# RGBLIGHT_ENABLE = yes
NO_USB_STARTUP_CHECK = yes # Workaround for issue 6369
+
+# Enter lower-power sleep mode when on the ChibiOS idle thread
+OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE