2 files changed, 7 insertions, 3 deletions

diff --git a/Documentation/input/alps.txt b/Documentation/input/alps.txt
index f274c28b5103..2f95308251d4 100644
--- a/Documentation/input/alps.txt
+++ b/Documentation/input/alps.txt
@@ -13,7 +13,8 @@ Detection
 
 All ALPS touchpads should respond to the "E6 report" command sequence:
 E8-E6-E6-E6-E9. An ALPS touchpad should respond with either 00-00-0A or
-00-00-64.
+00-00-64 if no buttons are pressed. The bits 0-2 of the first byte will be 1s
+if some buttons are pressed.
 
 If the E6 report is successful, the touchpad model is identified using the "E7
 report" sequence: E8-E7-E7-E7-E9. The response is the model signature and is
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index bd87380bd879..4c6a72d3d48c 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -952,7 +952,9 @@ static const struct alps_model_info *alps_get_model(struct psmouse *psmouse, int
 
         /*
          * First try "E6 report".
-         * ALPS should return 0,0,10 or 0,0,100
+         * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
+         * The bits 0-2 of the first byte will be 1s if some buttons are
+         * pressed.
          */
         param[0] = 0;
         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
@@ -968,7 +970,8 @@ static const struct alps_model_info *alps_get_model(struct psmouse *psmouse, int
         psmouse_dbg(psmouse, "E6 report: %2.2x %2.2x %2.2x",
                     param[0], param[1], param[2]);
 
-        if (param[0] != 0 || param[1] != 0 || (param[2] != 10 && param[2] != 100))
+        if ((param[0] & 0xf8) != 0 || param[1] != 0 ||
+            (param[2] != 10 && param[2] != 100))
                 return NULL;
 
         /*