I have encountered a strange problem for the detection of the wheel of my
PS/2 Mouse (Labtec, optical, three buttons plus wheel, works well
with the IMPS/2 driver) connected to a Laptop as an external mouse.
Actually, the problem appeares on a Dell Lattitude C840 which has a touch-pad
mouse (and also a mouse as a small rough button in the keyboard between the
keys "G" and "H"). Since I don't use neither the touch-pad nor the
button-mouse I have connected the optical mouse with wheel by a
standard PS/2 connector at the back of the Lattitude. Up to Kernel 2.6.12 and
also with all recent 2.4 kernels (including 2.4.31) the external mouse works
well with the wheel. However at 2.6.13 the wheel is no longer recognized.
I didn't test intermediate rc-releases between 2.6.12 and 2.6.13 but I have
seen in the Changelog that there has been some considerable modifications exactly
for the wheel detection in the psmouse-driver, for example:
----------------------------
commit 7b4019d04895de7407c9989895c3664c24ed01f7
Author: Vojtech Pavlik <[email protected]>
Date: Fri Jul 15 01:50:08 2005 -0500
Input: psmouse - wheel mice (imps, exps) always have 3rd button
Signed-off-by: Vojtech Pavlik <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
---------------------------
The reason for the non-detetection of the wheel in my case appears to be
quite simple. During the boot a of 2.6.12 or earlier kernels the driver
psmouse detects a standard ImPS/2 mouse with the message:
input: ImPS/2 Generic Wheel Mouse on isa0060/serio1
However with 2.6.13 it detects a different "mouse" due to the touch-pad which
is AlpsPS/2 and not ImPS/2, more precisely the AlpsPS/2-driver seems to be a
"better" (?) driver for the touch pad mouse but it does NOT recognize the
wheel of the external mouse. In addition the touch pad also seems to work
correctly with the ImPS/2-driver. The problem is also independent of the
fact if I use the nv-driver from XFree/Xorg or the nvidia-driver from NVIDIA
for the graphic card.
I have therefore commented in the file "drivers/input/mouse/psmouse-base.c"
the code where the AlpsPS/2-Mouse is detected and afterwards also the kernel
2.6.13 falls back to the ImPS/2 Mouse with the wheel properly working.
The corresponding patch is:
--- drivers/input/mouse/psmouse-base.c.orig Tue Aug 30 13:15:36 2005
+++ drivers/input/mouse/psmouse-base.c Fri Sep 2 14:07:01 2005
@@ -489,17 +489,21 @@
/*
* Try ALPS TouchPad
*/
+/*
if (max_proto > PSMOUSE_IMEX) {
ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
if (alps_detect(psmouse, set_properties) == 0) {
if (!set_properties || alps_init(psmouse) == 0)
return PSMOUSE_ALPS;
+*/
/*
* Init failed, try basic relative protocols
*/
+/*
max_proto = PSMOUSE_IMEX;
}
}
+*/
if (max_proto > PSMOUSE_IMEX && genius_detect(psmouse, set_properties) == 0)
return PSMOUSE_GENPS;
This is of course only a very simple work-around patch which aims mainly to
describe the problem than solving it. Furthermore I have no particular
knowledge of the internals of the psmouse-driver. For the moment being the above
patch solves the problem to my satisfaction, however, I suppose the
maintainers of this driver will find a proper way to enable the detection
of an external mouse with wheel even if there is an internal touch-pad mouse
(without simply disabling the AlpsPS/2-driver).
In case you need further information please make a "cc" to my email adress
since I am not subscribed to the kernel-mailing list (however I will regularly
consult the archive).
Greetings, Klaus Frahm.
On Fri, Sep 02, 2005 at 03:27:16PM +0200, [email protected] wrote:
>
> I have encountered a strange problem for the detection of the wheel of my
> PS/2 Mouse (Labtec, optical, three buttons plus wheel, works well
> with the IMPS/2 driver) connected to a Laptop as an external mouse.
>
> Actually, the problem appeares on a Dell Lattitude C840 which has a touch-pad
> mouse (and also a mouse as a small rough button in the keyboard between the
> keys "G" and "H"). Since I don't use neither the touch-pad nor the
> button-mouse I have connected the optical mouse with wheel by a
> standard PS/2 connector at the back of the Lattitude. Up to Kernel 2.6.12 and
> also with all recent 2.4 kernels (including 2.4.31) the external mouse works
> well with the wheel. However at 2.6.13 the wheel is no longer recognized.
> I didn't test intermediate rc-releases between 2.6.12 and 2.6.13 but I have
> seen in the Changelog that there has been some considerable modifications exactly
> for the wheel detection in the psmouse-driver, for example:
>
> ----------------------------
> commit 7b4019d04895de7407c9989895c3664c24ed01f7
> Author: Vojtech Pavlik <[email protected]>
> Date: Fri Jul 15 01:50:08 2005 -0500
>
> Input: psmouse - wheel mice (imps, exps) always have 3rd button
>
> Signed-off-by: Vojtech Pavlik <[email protected]>
> Signed-off-by: Dmitry Torokhov <[email protected]>
> ---------------------------
>
> The reason for the non-detetection of the wheel in my case appears to be
> quite simple. During the boot a of 2.6.12 or earlier kernels the driver
> psmouse detects a standard ImPS/2 mouse with the message:
>
> input: ImPS/2 Generic Wheel Mouse on isa0060/serio1
>
> However with 2.6.13 it detects a different "mouse" due to the touch-pad which
> is AlpsPS/2 and not ImPS/2, more precisely the AlpsPS/2-driver seems to be a
> "better" (?) driver for the touch pad mouse but it does NOT recognize the
> wheel of the external mouse. In addition the touch pad also seems to work
> correctly with the ImPS/2-driver. The problem is also independent of the
> fact if I use the nv-driver from XFree/Xorg or the nvidia-driver from NVIDIA
> for the graphic card.
>
> I have therefore commented in the file "drivers/input/mouse/psmouse-base.c"
> the code where the AlpsPS/2-Mouse is detected and afterwards also the kernel
> 2.6.13 falls back to the ImPS/2 Mouse with the wheel properly working.
> The corresponding patch is:
You can get the same behavior with 'psmouse.proto=imps' on the kernel
command line.
The reason why this happens is that the ALPS driver brings the ALPS
touchpad into native mode allowing features like vertical/horizontal
scrolling, circular scrolling, etc, which are not available in imps/2
mode.
Unfortunately, the ALPS passthrough doesn't allow for imps/2, only ps/2,
as far as we know. Unfortunately we haven't been able to find a notebook
with touchpad, touchpoint, *and* an external port, to try to make it
work.
> --- drivers/input/mouse/psmouse-base.c.orig Tue Aug 30 13:15:36 2005
> +++ drivers/input/mouse/psmouse-base.c Fri Sep 2 14:07:01 2005
> @@ -489,17 +489,21 @@
> /*
> * Try ALPS TouchPad
> */
> +/*
> if (max_proto > PSMOUSE_IMEX) {
> ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
> if (alps_detect(psmouse, set_properties) == 0) {
> if (!set_properties || alps_init(psmouse) == 0)
> return PSMOUSE_ALPS;
> +*/
> /*
> * Init failed, try basic relative protocols
> */
> +/*
> max_proto = PSMOUSE_IMEX;
> }
> }
> +*/
>
> if (max_proto > PSMOUSE_IMEX && genius_detect(psmouse, set_properties) == 0)
> return PSMOUSE_GENPS;
>
>
> This is of course only a very simple work-around patch which aims mainly to
> describe the problem than solving it. Furthermore I have no particular
> knowledge of the internals of the psmouse-driver. For the moment being the above
> patch solves the problem to my satisfaction, however, I suppose the
> maintainers of this driver will find a proper way to enable the detection
> of an external mouse with wheel even if there is an internal touch-pad mouse
> (without simply disabling the AlpsPS/2-driver).
I don't think it's possible to have both the ALPS touchpad and an
external mouse with full functionality. It's one or the other - a
limitation of the PS/2 protocol, which is designed for one (not three)
device only.
> In case you need further information please make a "cc" to my email adress
> since I am not subscribed to the kernel-mailing list (however I will regularly
> consult the archive).
--
Vojtech Pavlik
SuSE Labs, SuSE CR
On Fri, 2 Sep 2005 16:15:46 +0200, Vojtech Pavlik wrote:
> Unfortunately, the ALPS passthrough doesn't allow for imps/2, only ps/2,
> as far as we know. Unfortunately we haven't been able to find a notebook
> with touchpad, touchpoint, *and* an external port, to try to make it
> work.
I have a Dell Inspiron 8200. Like the Latitude of the OP, it has the
DualPoint ALPS and a PS/2 port, so I can help testing, if needed.
I can also get my hands on a 4-button Logitech Trackball (no
scrollwheels or anything, just four buttons), if it can help the
testing.
> I don't think it's possible to have both the ALPS touchpad and an
> external mouse with full functionality. It's one or the other - a
> limitation of the PS/2 protocol, which is designed for one (not three)
> device only
One thing that I noticed under 'the other OS' is that, when an
external PS/2 device is inserted and then disconnected, the 'internal'
ones (keyboard, touchpad) seem to lose sync. It has been some time
since I tried it the last time, so I should probably check again to
see if the extended protocols do work, somehow.
--
Giuseppe "Oblomov" Bilotta
Hic manebimus optime
On Sat, Sep 10, 2005 at 11:29:52AM +0200, Giuseppe Bilotta wrote:
> I have a Dell Inspiron 8200. Like the Latitude of the OP, it has the
> DualPoint ALPS and a PS/2 port, so I can help testing, if needed.
>
> I can also get my hands on a 4-button Logitech Trackball (no
> scrollwheels or anything, just four buttons), if it can help the
> testing.
>
> One thing that I noticed under 'the other OS' is that, when an
> external PS/2 device is inserted and then disconnected, the 'internal'
> ones (keyboard, touchpad) seem to lose sync. It has been some time
> since I tried it the last time, so I should probably check again to
> see if the extended protocols do work, somehow.
I have always been under the impression that PS2 devices were not
hotplugable at all.
Many machines stop responding on the ps2 mouse port if you disconnect
and reconnect the mouse. KVMs of course cause lots of trouble too for
that if they don't somehow fake the mouse still being present.
It works on some systems, but in my experience you don't touch ps/2
mice with the power on.
Len Sorensen