---
 drivers/acpi/osl.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-pm/drivers/acpi/osl.c
===================================================================
--- linux-pm.orig/drivers/acpi/osl.c
+++ linux-pm/drivers/acpi/osl.c
@@ -607,6 +607,12 @@ acpi_status acpi_os_remove_interrupt_han
 
 void acpi_os_sleep(u64 ms)
 {
+	if (ms <= 20) {
+		u64 us = ms * USEC_PER_MSEC;
+
+		usleep_range(us, us + us / 8);
+		return;
+	}
 	msleep(ms);
 }