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SubjectALPS tapping disabled. WHY?
Trying out 2.6.11-rc5, I discovered my ALPS touchpad misbehaving. After
reading several threads related to the topic, noe seemed to resolve my
issue.

The pad has always worked fine as a plain PS/2 mouse, from 2.4.0 through
2.6.10.

This change fixes the problem by NOT disabling hardware tapping:

--- linux-2.6.11-rc5/drivers/input/mouse/alps.c~ 2005-02-24 18:16:03.000000000 -0500
+++ linux-2.6.11-rc5/drivers/input/mouse/alps.c 2005-02-24 18:16:03.000000000 -0500
@@ -334,8 +334,8 @@
if (alps_get_status(psmouse, param))
return -1;

- if (param[0] & 0x04)
- alps_tap_mode(psmouse, 0);
+// if (param[0] & 0x04)
+// alps_tap_mode(psmouse, 0);

if (alps_absolute_mode(psmouse)) {
printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
@@ -372,11 +372,11 @@
return -1;
}

- if (param[0] & 0x04) {
- printk(KERN_INFO " Disabling hardware tapping\n");
- if (alps_tap_mode(psmouse, 0))
- printk(KERN_WARNING "alps.c: Failed to disable hardware tapping\n");
- }
+// if (param[0] & 0x04) {
+// printk(KERN_INFO " Disabling hardware tapping\n");
+// if (alps_tap_mode(psmouse, 0))
+// printk(KERN_WARNING "alps.c: Failed to disable hardware tapping\n");
+// }

if (alps_absolute_mode(psmouse)) {
printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");


So now, can anyone explain what bit 3 of param[0] does, and why you would
want to disable hardware tapping support when it's set? My pad (ALPS
56AAA1760C on a Sager NP8560V) has always worked with hardware tapping as a
plain PS/2 mouse, no special ALPS support req'd.

Can this disabling of hardware tapping support be made optional (boot time
param or other)? I don't want to have to patch every kernel from here on
out.

Regards,
Ian Morgan

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