https://bugzilla.kernel.org/show_bug.cgi?id=15895





--- Comment #52 from Lan Tianyu <tianyu....@intel.com>  2013-05-15 01:09:15 ---
It's better to open EC debug to see what happen in the EC driver during
changing brightness.
Please open the EC debug and attach the output of dmesg after changing
brightness.
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d45b287..34189f4 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -27,7 +27,7 @@
  */

 /* Uncomment next line to get verbose printout */
-/* #define DEBUG */
+#define DEBUG

 #include <linux/kernel.h>
 #include <linux/module.h>

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