On Thursday 24 February 2005 18:29, Ian E. Morgan wrote:
> 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.
>
It still should do software tap emulation (although support is a bit flakey
with ALPS I must admit, but there are patches that should improve it) - so
people who don't like tapping can deactivate it.
Anyway, "psmouse.proto=exps" boot option should disable ALPS native mode and
restore previous behavior.
--
Dmitry
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