Add configurable x/y resolution to fix sensitivity on wide touchpads.

Synaptics uses anisotropic coordinate system.  On some wide touchpads
vertical resolution can be twice as high as horizontal which causes
unequal sensitivity on x/y directions.

VertResolution and HorizResolution can be used to set the resolution.
The ratio of the values is used to compensate x/y sensitivity.  The
properties are configured automatically if touchpad reports resolution
and if running on linux 2.6.31 or newer.

Fixes xorg bug #18351.

Signed-off-by: Tero Saarni <tero.saarni@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/properties.c b/src/properties.c
index 64dbc9e..43bcabb 100644
--- a/src/properties.c
+++ b/src/properties.c
@@ -82,6 +82,7 @@ Atom prop_pressuremotion_factor = 0;
 Atom prop_grab                  = 0;
 Atom prop_gestures              = 0;
 Atom prop_capabilities          = 0;
+Atom prop_resolution            = 0;
 
 static Atom
 InitAtom(DeviceIntPtr dev, char *name, int format, int nvalues, int *values)
@@ -262,6 +263,11 @@ InitDeviceProperties(LocalDevicePtr local)
     values[3] = priv->has_double;
     values[4] = priv->has_triple;
     prop_capabilities = InitAtom(local->dev, SYNAPTICS_PROP_CAPABILITIES, 8, 5, values);
+
+    values[0] = para->resolution_vert;
+    values[1] = para->resolution_horiz;
+    prop_resolution = InitAtom(local->dev, SYNAPTICS_PROP_RESOLUTION, 32, 2, values);
+
 }
 
 int
@@ -612,6 +618,10 @@ SetProperty(DeviceIntPtr dev, Atom property, XIPropertyValuePtr prop,
     {
         /* read-only */
         return BadValue;
+    } else if (property == prop_resolution)
+    {
+        /* read-only */
+        return BadValue;
     }
 
     return Success;