diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
index 754cf289fc01..b9b98a7cad4d 100644
--- a/drivers/acpi/acpica/exsystem.c
+++ b/drivers/acpi/acpica/exsystem.c
@@ -169,6 +169,16 @@ acpi_status acpi_ex_system_do_sleep(u64 how_long_ms)
 
 	acpi_ex_exit_interpreter();
 
+	/*
+	 * Warn users about excessive sleep times, so ASL code can be improved to
+	 * use polling or similar techniques.
+	 */
+	if (how_long_ms > 10) {
+		ACPI_WARNING((AE_INFO,
+			      "Firmware issue: Excessive sleep time (%llu ms > 10 ms) in ACPI Control Method",
+			      how_long_us));
+	}
+
 	/*
 	 * For compatibility with other ACPI implementations and to prevent
 	 * accidental deep sleeps, limit the sleep time to something reasonable.