Touchpad scrolling blazing fast in KF5 apps

Wu · 2015-01-30 17:45:27

I noticed that the touchpad two-fingers vertical scrolling is extremely fast in kf5 apps, e.g.: kate.

I also noticed the same issue in the Plasma 5 UI, e.g.: when scrolling over the kmix systray icon to increase/decrease the volume (on the other hand the scroling speed is fine "inside" the kmix app)

The scrolling speed is fine in all other apps, including KDE apps not yet ported to KF5 (e.g.: dolphin).

I tried changing with the touchpad kcm but it does not seem to have any effect (whatever the value the speed is always super fast). I also tried to remove the rc file for the touchpad in .confing, with no luck.

Anybody else with the same issue?

Is there something like a global setting for the X server that can override KDE settings?

Head_on_a_Stick · 2015-01-30 17:50:50

I'm not sure if it will be over-ridden by KDE, but you can try this option in /usr/share/X11/xorg.conf.d/50-synaptics.conf:

    Option "VertScrollDelta" "50"

You can test the value by using `synclient VertScrollDelta=<value>`

Wu · 2015-01-30 18:18:20

thanks for your reply. It seems unfortunately that KDE overrides the setting, I see no difference whatever the value I set.

convict · 2015-02-01 01:28:06

I'm having the exact same problem, synclient settings appear to have no effect. What I noticed is that it seems to scroll a full three lines for each pixel of movement; It looks like some kind of weird smooth scrolling confusion, where motion events are interpreted correctly (i.e. it's listening to motion events rather than scroll events), but instead of scrolling smoothly like it should it's still scrolling several lines each time it should only be scrolling several pixels. I upgraded only just yesterday, and don't recall having had this problem in KF5 apps under KDE4, but I can't tell for sure. I'm hunting for a solution right now as well.

mauritiusdadd · 2015-02-01 07:40:03

Hi, I'm having the same problem too and, as Wu already said, nothing seems to work (and this is particularly annoying in kate when you need to open a file with thousands of lines). However, while I was searching for a solution, I just noted that changing the scroll speed in the mouse kcm module partially works also for KF5 applications:

Open the KF5 application you need to use (kate for example)
While the application is running, execute the command
```
kcmshell5 mouse
```
and switch to the tab Advanced
Set the mouse to scroll 1 line at time
If it is already set to scroll 1 line at time, then change it to another value (2 lines for example), apply the setting and set it back to 1 line at time
Finally apply the settings and close the kcm module. Now the scroll speed should be slower

The strange thing is that scroll setting lasts until the application is closed, so the procedure must be repeated every time you restart the application: can anyone else confirm this behaviour?

Last edited by mauritiusdadd (2015-02-01 07:41:10)

Wu · 2015-02-01 18:13:12

Confirmed with both kate from [extra] and kate compiled from git.

Just to be sure that this is not related to a specific touchpad model, what laptop are you using? I'm on a Dell Inspiron R

Last edited by Wu (2015-02-01 18:15:24)

mauritiusdadd · 2015-02-02 06:02:28

I'm running Arch on a Samsung Series 5 (NP530U3C). Here there is my touchpad model info:

/proc/bus/input/devices wrote:

...
I: Bus=0011 Vendor=0002 Product=000e Version=0000
N: Name="ETPS/2 Elantech Touchpad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input10
U: Uniq=
H: Handlers=event9 mouse0
B: PROP=1
B: EV=b
B: KEY=6420 30000 0 0 0 0
B: ABS=260800011000003
...

elfio · 2015-02-17 20:10:11

Mine one is a Dell M1330 with exactly the same issue. It slow down while config has been edited (still too fast I think) but once you close Kate and open it again, the issue is back.
The only app I've found with this problem is Kate/Kwrite until now.

/proc/bus/input/devices 

I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input7
U: Uniq=
H: Handlers=event14 mouse1 
B: PROP=1
B: EV=b
B: KEY=420 30000 0 0 0 0
B: ABS=11000003

mauritiusdadd · 2015-02-22 10:40:34

The last update seems to fix this issue, at least for me.

elfio · 2015-02-22 11:10:11

It's also fixed for me.

johnny_boy · 2016-03-01 21:37:28

I have the same issue running Kubuntu with project neon, Plasma 5.5.90, qt 5.5.1. I never had this problem on plasma 5.5.3 (without neon). I have an Elantech touchpad. Changing the synclient settings have absolutely no effect. I wiped my .config and .cache files but the problem still persists. Weird how this was fixed on arch but not Kubuntu + neon. What version of qt is arch using?

Arch Linux

#1 2015-01-30 17:45:27

Touchpad scrolling blazing fast in KF5 apps

#2 2015-01-30 17:50:50

Re: Touchpad scrolling blazing fast in KF5 apps

#3 2015-01-30 18:18:20

Re: Touchpad scrolling blazing fast in KF5 apps

#4 2015-02-01 01:28:06

Re: Touchpad scrolling blazing fast in KF5 apps

#5 2015-02-01 07:40:03

Re: Touchpad scrolling blazing fast in KF5 apps

#6 2015-02-01 18:13:12

Re: Touchpad scrolling blazing fast in KF5 apps

#7 2015-02-02 06:02:28

Re: Touchpad scrolling blazing fast in KF5 apps

#8 2015-02-17 20:10:11

Re: Touchpad scrolling blazing fast in KF5 apps

#9 2015-02-22 10:40:34

Re: Touchpad scrolling blazing fast in KF5 apps

#10 2015-02-22 11:10:11

Re: Touchpad scrolling blazing fast in KF5 apps

#11 2016-03-01 21:37:28

Re: Touchpad scrolling blazing fast in KF5 apps

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