https://bugzilla.kernel.org/show_bug.cgi?id=14733#c41

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c

index 27e0b92..09fbb69 100644

--- a/drivers/acpi/ec.c

+++ b/drivers/acpi/ec.c

@@ -226,6 +226,7 @@ static int ec_poll(struct acpi_ec *ec)

 				if (ec_transaction_done(ec))

 					return 0;

 			} else {

+				msleep(1);

 				if (wait_event_timeout(ec->wait,

 						ec_transaction_done(ec),

 						msecs_to_jiffies(1)))

@@ -233,8 +234,8 @@ static int ec_poll(struct acpi_ec *ec)

 			}

 			advance_transaction(ec, acpi_ec_read_status(ec));

 		} while (time_before(jiffies, delay));

-		if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)

-			break;

+//		if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)

+//			break;

 		pr_debug(PREFIX "controller reset, restart transaction\n");

 		spin_lock_irqsave(&ec->curr_lock, flags);

 		start_transaction(ec);

@@ -271,15 +272,25 @@ static int ec_check_ibf0(struct acpi_ec *ec)

 	return (status & ACPI_EC_FLAG_IBF) == 0;

 }

+/* try to clean input buffer with burst_disable transaction */

+static int acpi_ec_clean_buffer(struct acpi_ec *ec)

+{

+	struct transaction t = {.command = ACPI_EC_BURST_DISABLE,

+				.wdata = NULL, .rdata = NULL,

+				.wlen = 0, .rlen = 0};

+	return acpi_ec_transaction_unlocked(ec, &t);

+}

+

 static int ec_wait_ibf0(struct acpi_ec *ec)

 {

+	

 	unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);

 	/* interrupt wait manually if GPE mode is not active */

 	while (time_before(jiffies, delay))

 		if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),

 					msecs_to_jiffies(1)))

 			return 0;

-	return -ETIME;

+	return acpi_ec_clean_buffer(ec);

 }

 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)