On 2/28/2014 5:28 PM, John Hupp wrote:
On 2/27/2014 8:10 PM, John Hupp wrote:
On 2/26/2014 6:41 PM, John Hupp wrote:
On 2/25/2014 7:00 PM, John Hupp wrote:
On 2/22/2014 8:24 PM, John Hupp wrote:
On 2/20/2014 12:07 PM, John Hupp wrote:
On 2/20/2014 3:05 AM, Ali Linx wrote:
On 02/20/2014 05:26 AM, John Hupp wrote:
I just installed Lubuntu Saucy on a Lenovo 3000 laptop and I'm
finding that touchpad double-tap does not seem to work
(Synaptics touchpad).
I've seen a few other complaints on related topics but haven't
found anything that really defines what can be configured on
touchpads and how.
Options?
Hi,
AskUbuntu? Ubuntu Forums?
Try :)
I could have added that one of the posts I saw said that
double-tap worked fine in Ubuntu, but not in Lubuntu.
So it would seem that this list ought to be a good place to bring
this up.
After further playing around, it seemed that double-tap was not
disabled, but required *VERY* fast tapping.
I found synclient, which is installed in Lubuntu Saucy and
supposed to control Synaptics touchpad behavior, with
documentation at
http://manpages.ubuntu.com/manpages/saucy/man1/synclient.1.html
That documentation indicates that the related config file is at
/etc/X11/xorg.conf, but that doesn't exist on my machine, so at
the moment I don't know what the universal/user configuration
locations are.
synclient -l reports MaxDoubleTapTime=180 initially, and it
allowed me to set 'synclient MaxDoubleTapTime=360.' I'm guessing
that it could probably be set as high as 1000.
This seemed to help, but double-tap is still unreliable: sometimes
it seems to require unreasonably forceful tapping.
synclient also reports settings for:
PressureMotionMinZ
PressureMotionMaxZ
PressureMotionMinFactor
PressureMotionMaxFactor
But it is not self-evident to me what behaviors those settings are
supposed to govern and if any of them would set the touchpad to
respond to a lighter touch.
I have not yet found any better documentation, and maybe that
would help me achieve better control. So I'm still open to
further help!
I know more now but still don't have a resolution.
Documentation of the settings reported and governed per-session by
synclient are at
http://manpages.ubuntu.com/manpages/saucy/man4/synaptics.4.html
FingerLow and FingerHigh are the settings that should govern
sensitivity, if that is my issue.
Default settings are automatically configured by Xorg, but may be
temporarily changed during a session via synclient. Make permanent
changes by editing /usr/share/X11/xorg.conf.d/50-synaptics.conf and
adding Options to the existing InputClass section that has the
Identifier "touchpad catchall." An example with Options for
FingerLow and FingerHigh:
Section "InputClass"
Identifier "touchpad catchall"
Driver "synaptics"
MatchIsTouchpad "on"
MatchDevicePath "/dev/input/event*"
Option "FingerLow" "10"
Option "FingerHigh" "16"
EndSection
This laptop is dual-booting Saucy with Windows Vista, and so far I
have not been able to configure the touchpad so that it double-taps
easily and consistently/reliably the way it does in Windows.
(Which is also to say that I know that the touchpad hardware is OK
because it works fine in Windows.)
I booted into the *Ubuntu* Live DVD on this laptop, and touchpad
double-tapping performed very smoothly.
Under Ubuntu, synclient reported different values for VertEdgeScroll
and HorizTwoFingerScroll than Lubuntu reported, but changing those
settings to match in Lubuntu did not help the double-tap problem.
I installed Lubuntu Saucy on another laptop, and double-tap worked
beautifully on that machine, but it has an Alps touchpad rather than
Synaptics.
I booted into the Lubuntu Trusty 2/14 Daily Build Live DVD on the
problem laptop and found that it had the same problem with
double-tap, but while there I discovered that a *TRIPLE-TAP*
reliably yielded the behavior expected for a double-tap.
So I booted back into Saucy from the hard drive, and found that
there too, a triple-tap reliably yielded the behavior wanted for a
double-tap.
It seems like this information could be used to alter the settings
to get expected behavior from a double-tap, but I'm not sure how.
Does this tell anyone something?
It seems to me like this behavior is a bug, probably related to Xorg,
or more likely LXDE since it does not occur under Ubuntu.
I like the idea that Trusty is a bug-fix-oriented release, and I'd
like to see what I can do to help get this fixed for Trusty as well
as Saucy.
I've been reading https://wiki.ubuntu.com/Lubuntu/Testing/ and linked
docs. It seems like I would be required to join a QA team in order
to do anything (e.g. access the QA mail list), even if my focus were
fixing one problem. Then I read about laptop testing, and it seemed
that one would have to join a laptop testing team that was
Ubuntu-oriented rather than focused on Lubuntu, and the job
description also seems focused on execution of prescribed test cases.
I should say that I also have an interest in certain other bug-fixes
for Trusty -- most of them for the desktop -- but admitting my
immediate interest in this specific laptop problem, does anyone have
advice on how to proceed?
One late, parting thought: Instead of joining a QA team, etc., can I
file a standard bug report at Launchpad for issues with Trusty?
OK, without knowing for sure if this was the best way to proceed, I
filed a bug report for Saucy at
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/1286326
and for Trusty at
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/1286372
In both cases I filed against xserver-xorg-input-synaptics, even while
wondering why the same package would work under Ubuntu but not Lubuntu.
It seems that the synclient MaxDoubleTapTime setting (or setting
MaxDoubleTapTime in /usr/share/X11/xorg.conf.d\50-synaptics.conf) does
not govern the Synaptics touchpad double-tap.
Instead, it is responding to a GTK2 setting, in which the default
double-tap time is 250 ms.
To change that per-user (and there is probably a global setting
somewhere -- wish I knew where), create ~/.gtkrc-2.0 with content like:
gtk-double-click-time=400
though values up to 1000 are sometimes suggested.
Sources: http://forum.lxde.org/viewtopic.php?f=8&t=501 and
https://help.ubuntu.com/community/Lubuntu/Mouse
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