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15 inch titanium powerbook 800Mhz, sloppy feeling touchpad
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ccarr
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PostPosted: Mon Jul 12, 2004 4:22 am    Post subject: 15 inch titanium powerbook 800Mhz, sloppy feeling touchpad Reply with quote

I don't really know how to describe this problem, but the best way I know how is that my powerbook touchpad feels "sloppy."

What I really mean, I suppose, is that it feels imprecise, which means that when I am trying to click on window decorations, hyperlinks, menu items, or pretty much anything small, I miss it. What seems to be happening is that the cursor keeps moving slightly after I stop. Basically my finger stops, but the cursor just kind of slows down and finally stops about five pixels beyond where I wanted it. Unfortunately, this makes the thing almost unusable since I code on the train everyday on the way to and from work and frequently do not have the luxury of using a mouse. I don't use a mouse much, but when I need it I really need it, know what I mean? The problem does not happen with a USB mouse.

I hacked Xeasyconf to configure X.org for me and it gave me the following for the mouse section:

Code:
Section "InputDevice"
Identifier  "Mouse0"
Driver      "mouse"
Option  "Protocol"        "IMPS/2"
Option          "ZAxisMapping"  "4 5"
Option          "Device"        "/dev/input/mice"
EndSection


--- which is able to grab both the touchpad and the usb mouse when it is plugged in (and is basically what I would have configured myself). I am using kernel 2.6.7-gentoo-r8. I have also tried "auto" for "Protocol" with the same results. Please let me know if you need any more details.

Thanks in advance if you can help me with this problem.
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Jean Vertigo
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PostPosted: Mon Jul 12, 2004 6:25 pm    Post subject: Reply with quote

hi, i've the same problem with an ibook g4 1ghz.
The strage thing is that with an usb mouse it work perfectly...
someone told me that is related with the preemptive code in the kernel..bah...i haven't recompiled the 2.6.7 yet, i'll try.
:?
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ccarr
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PostPosted: Tue Jul 13, 2004 4:07 am    Post subject: Reply with quote

Jean Vertigo wrote:

someone told me that is related with the preemptive code in the kernel..bah...i haven't recompiled the 2.6.7 yet, i'll try.
:?


Tried it just now with 2.6.7-gentoo-r8. Compiled out

[ ] Preemptible Kernel

support. Didn't help. Just so you know.
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Jean Vertigo
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PostPosted: Tue Jul 13, 2004 12:09 pm    Post subject: Reply with quote

good... :cry:
cannot believe that we are only two, to have this problem...

bye
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ruben
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PostPosted: Tue Jul 13, 2004 2:52 pm    Post subject: Reply with quote

The question is whether it is really a software problem. I have more or less the same problems with the touchpad on my ibook G3. And for example on the train it is pretty hard to enlarge my xterms who have only 1-pixel borders. But i never miss hyperlinks or menu items, so i don't know whether it's really the same. But AFAIK, those touchpads work with heat... so you move the cursor with the heat coming from your finger, and maybe if you stop moving then you tilt over your finger a little which enlarges/changes the contact with the touchpad and causes your cursor to move a little further? I'm just guessing here. Hmm.. maybe making the touchpad less 'sensitive' (so that the cursor moves slower) might be a solution?

Oh.. and AFAIK the 2.6 kernels are still unstable when using "preemptive kernel" on PPC, so you shouldn't use it.
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Jean Vertigo
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PostPosted: Tue Jul 13, 2004 4:18 pm    Post subject: Reply with quote

ruben wrote:
Oh.. and AFAIK the 2.6 kernels are still unstable when using "preemptive kernel" on PPC, so you shouldn't use it.


yes, i know it's unstable.
Obviously it's a software problem, some calibrating routine, but i don't know if it's in the kernel source or in Xorg source...i should investigate soon.. 8O
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ccarr
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PostPosted: Thu Jul 15, 2004 2:57 am    Post subject: Reply with quote

Jean Vertigo wrote:
ruben wrote:
Oh.. and AFAIK the 2.6 kernels are still unstable when using "preemptive kernel" on PPC, so you shouldn't use it.


yes, i know it's unstable.
Obviously it's a software problem, some calibrating routine, but i don't know if it's in the kernel source or in Xorg source...i should investigate soon.. 8O


What exactly do you mean by unstable? I am running it here as a desktop oriented system with no problems. Is there something I can do to make it fail? I'd like to know what to expect.

Also, the cursor is distinctly not stopping, even though my finger is very much stopping. The problem is very subtle, like I said, only about 5 pixels or so, but it is enough to make me concentrate while clicking. It is not effortless like on MacOS.
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ruben
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PostPosted: Thu Jul 15, 2004 10:25 am    Post subject: Reply with quote

ccarr wrote:
What exactly do you mean by unstable? I am running it here as a desktop oriented system with no problems. Is there something I can do to make it fail? I'd like to know what to expect.

When i used a preemptive kernel, some applications started to segfault without any special reason. Now that i think about it, it were 2 games crack-attack and supertux, with the preemptive kernel they gave segmentation faults at random times. I guessed that was because of the unstable preemptive option, so i removed it from the kernel, and those applications didn't crash anymore.
ccarr wrote:
Also, the cursor is distinctly not stopping, even though my finger is very much stopping. The problem is very subtle, like I said, only about 5 pixels or so, but it is enough to make me concentrate while clicking. It is not effortless like on MacOS.

ok.. i'm afraid i can't help you with that.. sorry.
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ccarr
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PostPosted: Fri Jul 16, 2004 3:50 am    Post subject: Reply with quote

ruben wrote:
ccarr wrote:
What exactly do you mean by unstable? I am running it here as a desktop oriented system with no problems. Is there something I can do to make it fail? I'd like to know what to expect.

When i used a preemptive kernel, some applications started to segfault without any special reason. Now that i think about it, it were 2 games crack-attack and supertux, with the preemptive kernel they gave segmentation faults at random times. I guessed that was because of the unstable preemptive option, so i removed it from the kernel, and those applications didn't crash anymore.

Okay, so I might not see it if I don't play games? That is good, but I will definitely watch out for random segfaults.
ruben wrote:

ccarr wrote:
Also, the cursor is distinctly not stopping, even though my finger is very much stopping. The problem is very subtle, like I said, only about 5 pixels or so, but it is enough to make me concentrate while clicking. It is not effortless like on MacOS.

ok.. i'm afraid i can't help you with that.. sorry.


That is too bad, it is really annoying. I can't believe that nobody out there on ppc has the same problem? Why am I so special? Do others have the same problem, yet just don't know how to fix it? I am polling here.
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Jean Vertigo
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PostPosted: Fri Jul 16, 2004 5:02 pm    Post subject: Reply with quote

another interesting thing is that with gpm there's no problem at all with the touchpad, so it's surely an Xorg/Xfree issue. :?
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Gherald2
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PostPosted: Fri Jul 16, 2004 5:10 pm    Post subject: Reply with quote

Er, doesn't gdm start an X server and use the same one before and after you log on?

(I could be wrong about this since I depend on startx)
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Jean Vertigo
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PostPosted: Fri Jul 16, 2004 5:36 pm    Post subject: Reply with quote

gdm? I speak of GPM.....:P
"gpm - a cut and paste utility and mouse server for virtual consoles"
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