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Old 7th November 2011, 09:36 PM
sirio400516x Offline
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Join Date: Oct 2011
Location: Garching bei München, Germany
Posts: 15
DELL Precision M4600 Touchpad enabling/disabling

Problem: touchpad recognized as PS2 mouse, Fn+F5 enabling/disabling does not work.
Laptop: Dell Precision M4600
OS: Fedora 14
Notes: The bug is quiet general and is due most likely to the fact that the touchpad is an ALPS component, for which there isn's yet a proprietary driver (seems like they will release soon though).

I have been surfing for a while and I think the situation is like this: since there are no proprietary drivers, at the moment seems possible to only work around by
1. Patching the kernel (repatch at every kernel update)
2. Using a script
I prefer the latter because is more intuitive to me and don't have to repeat every time the kernel updates.

How the script basically works
It turns out that to disable/enable the touchpad (and, unfortunately, the pointing stick too) only one command line is necessary, provided you have the device id. Thus, the relevant code for switching on/off the touchpad is just
1. get the device id
1.a if xinput misses, do
 sudo yum install xinput
 xinput -list 
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ PS/2 Generic Mouse                      	id=12	[slave  pointer  (2)]
2. disable device with
 xinput set-int-prop 12 "Device Enabled" 8 0
3. enable device with
 xinput set-int-prop 12 "Device Enabled" 8 1
Now, I found two scripts which perform this command asking the system the device status, one in bash and one in python. The bash one executes every time a proper keyboard shotcut is called, while the python one starts at initialization and last until you switch off the laptop.
I find the bash one very elementary and, thus, suitable to most of people, however I will attach both.

Download the script, put it somewhere, let's say /bin/touchpad.sh
Give it 755 permissions with
 sudo chmod 755 /bin/touchpad.sh
Create a keyboard shortcut with
System > Preferences > Keyboard Shortcuts > Add > Name: touchpad, Command: /bin/touchpad.sh
Set now the preferred keyboard shortcut. DONE

Python SCRIPT (not tested though)[Rename from touchpad.py.txt to touchpad.py]
Download the script, put it somewhere, let's say /bin/touchpad.py. Give it 755 permissions. Now, in the konsole
 sudo emacs -nw /etc/rc.local
Write /bin/touchpad.py
Ctrl-x Ctrl-s, to save
Ctrl-x Ctrl-c, to quit

I put some further reading, even for the kernel patch

Attached Files
File Type: sh touchpad.sh (1.0 KB, 207 views)
File Type: txt touchpad.py.txt (1.7 KB, 174 views)

Last edited by sirio400516x; 7th November 2011 at 09:40 PM.
Old 11th April 2016, 04:35 AM
bkorb Offline
Registered User
Join Date: Jul 2006
Posts: 28
Re: DELL Precision M4600 Touchpad enabling/disabling

The attachments are downloading as empty files. Can they just be pasted as plain text, please?
Old 11th April 2016, 12:12 PM
bob Online
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Location: Colton, NY; Junction of Heaven & Earth (also Routes 56 & 68).
Age: 72
Posts: 23,221
Re: DELL Precision M4600 Touchpad enabling/disabling

Please don't tack your post onto a 5-yr. old thread. So much has changed and your problem deserves it's own thread. This one's CLOSED.
Linux & Beer - That TOTALLY Computes!
Registered Linux User #362651

Don't use any of my solutions on working computers or near small children.
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