1 files changed, 15 insertions, 7 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 601dbe8b407a..7dc6b73e8f5b 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -239,6 +239,7 @@ static struct {
 
 static struct {
         u16 hotkey_mask_ff:1;
+        u16 bright_cmos_ec_unsync:1;
 } tp_warned;
 
 struct thinkpad_id_data {
@@ -4323,13 +4324,20 @@ static int brightness_get(struct backlight_device *bd)
                 level = lcmos;
         }
 
-        if (brightness_mode == 3 && lec != lcmos) {
-                printk(TPACPI_ERR
-                        "CMOS NVRAM (%u) and EC (%u) do not agree "
-                        "on display brightness level\n",
-                        (unsigned int) lcmos,
-                        (unsigned int) lec);
-                return -EIO;
+        if (brightness_mode == 3) {
+                if (lec == lcmos)
+                        tp_warned.bright_cmos_ec_unsync = 0;
+                else {
+                        if (!tp_warned.bright_cmos_ec_unsync) {
+                                printk(TPACPI_ERR
+                                        "CMOS NVRAM (%u) and EC (%u) do not "
+                                        "agree on display brightness level\n",
+                                        (unsigned int) lcmos,
+                                        (unsigned int) lec);
+                                tp_warned.bright_cmos_ec_unsync = 1;
+                        }
+                        return -EIO;
+                }
         }
 
         return level;