GNU bug report logs - #57526
29.0.50; Precise pixel-scrolling works great with touchpad but not with mouse wheel

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Precise pixel-scrolling works great with touchpad but not
 with mouse wheel
Date: Thu, 01 Sep 2022 15:48:43 +0200

1. emacs -Q
2. In *scratch* evaluate

(pixel-scroll-mode 1)
(setq pixel-scroll-precision-use-momentum t)
(pixel-scroll-precision-mode 1)

The result for me is that scrolling with my notebook's touchpad is
precise and uses momentum.  But scrolling with the mouse wheel seems to
scroll about 8 lines with each "click" of the wheel in one redisplay (so
it's not smooth at all) and there seems to be no momentum (which is
probably correct because the wheel doesn't give the ability to stop
momentum scrolling).  C-h k reports that wheel-down/up are bound to
pixel-scroll-precision.  On the touchpad it seems next to wheel-down/up
events a final touch-end event is generated starting the momentum
scrolling.

The reason for the difference is that the EVENTs passed to
pixel-scroll-precision have very different delta values.  The touchpad
events command emacs to scroll about 20 pixels, the mouse wheel events
command it to scroll 150 pixels.

I see there's some interpolation feature which might be relevant but I
don't get into that code path because (device-class last-event-frame
last-event-device) returns core-keyboard instead of mouse.  I get that
value in both the case where I scrolled using touchpad as well as mouse.
When I typed something with the real keyboard, it says just keyboard.


In GNU Emacs 29.0.50 (build 13, x86_64-pc-linux-gnu, GTK+ Version
 3.24.34, cairo version 1.17.6) of 2022-09-01 built on thinkpad-t440p
Repository revision: 67b85decc7702c24f2904e60e3eecfc2bfca5ab6
Repository branch: master
System Description: Arch Linux

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Message #8 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Fri, 02 Sep 2022 09:15:00 +0800

Tassilo Horn <tsdh <at> gnu.org> writes:

> The reason for the difference is that the EVENTs passed to
> pixel-scroll-precision have very different delta values.  The touchpad
> events command emacs to scroll about 20 pixels, the mouse wheel events
> command it to scroll 150 pixels.

Try playing with pixel-scroll-precision-large-scroll-height; start with
a value of 30, and adjust it upwards if it interferes with trackpad
scrolling.

> I see there's some interpolation feature which might be relevant but I
> don't get into that code path because (device-class last-event-frame
> last-event-device) returns core-keyboard instead of mouse.  I get that
> value in both the case where I scrolled using touchpad as well as mouse.
> When I typed something with the real keyboard, it says just keyboard.

That part of the code will be reworked soon in accordance with an
earlier discussion, and you can assist with that by sending the result
of running "xinput list --long", which will help determine why your
mouse is not being recognized by Emacs.

Unfortunately momentum will not work with any non-trackpad mice other
than Apple's "Magic Mouse 2" (which recently gained driver support on
the kernel side), since the necessary tactile information is not
reported to programs by their hardware.

Message #11 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Fri, 02 Sep 2022 06:57:15 +0200

[Message part 1 (text/plain, inline)]

Po Lu <luangruo <at> yahoo.com> writes:

>> The reason for the difference is that the EVENTs passed to
>> pixel-scroll-precision have very different delta values.  The
>> touchpad events command emacs to scroll about 20 pixels, the mouse
>> wheel events command it to scroll 150 pixels.
>
> Try playing with pixel-scroll-precision-large-scroll-height; start
> with a value of 30, and adjust it upwards if it interferes with
> trackpad scrolling.

Oh, yes, that does the trick.  I don't actually feel much of a
difference (if any) no matter if I set it to 10 vs. 140.  It seems it
must be at least smaller as the delta in the mouse wheel events (150) in
order to have any effect but that's it.  So I went with 140.

>> I see there's some interpolation feature which might be relevant but
>> I don't get into that code path because (device-class
>> last-event-frame last-event-device) returns core-keyboard instead of
>> mouse.  I get that value in both the case where I scrolled using
>> touchpad as well as mouse.  When I typed something with the real
>> keyboard, it says just keyboard.
>
> That part of the code will be reworked soon in accordance with an
> earlier discussion, and you can assist with that by sending the result
> of running "xinput list --long", which will help determine why your
> mouse is not being recognized by Emacs.

The short list is:

--8<---------------cut here---------------start------------->8---
❯ xinput list
WARNING: running xinput against an Xwayland server. See the xinput man page for details.
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ xwayland-pointer:39                     	id=6	[slave  pointer  (2)]
⎜   ↳ xwayland-relative-pointer:39            	id=7	[slave  pointer  (2)]
⎜   ↳ xwayland-pointer-gestures:39            	id=8	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ xwayland-keyboard:39                    	id=9	[slave  keyboard (3)]
--8<---------------cut here---------------end--------------->8---

Interestingly, that list is the same no matter if I plugged my mouse
into my notebook's USB slot or if it is not connected.

The long list is attached.

[xinput-list-long.txt (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

Bye,
Tassilo

Message #14 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Fri, 02 Sep 2022 17:30:41 +0800

Tassilo Horn <tsdh <at> gnu.org> writes:

> The short list is:
>
> ❯ xinput list
> WARNING: running xinput against an Xwayland server. See the xinput man page for details.
> ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
> ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
> ⎜   ↳ xwayland-pointer:39                     	id=6	[slave  pointer  (2)]
> ⎜   ↳ xwayland-relative-pointer:39            	id=7	[slave  pointer  (2)]
> ⎜   ↳ xwayland-pointer-gestures:39            	id=8	[slave  pointer  (2)]
> ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
>     ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
>     ↳ xwayland-keyboard:39                    	id=9	[slave  keyboard (3)]
>
> Interestingly, that list is the same no matter if I plugged my mouse
> into my notebook's USB slot or if it is not connected.

Ah, you're using Xwayland.

Unfortunately, that X server is not implemented properly, so the X build
of Emacs cannot determine the source of wheel movement correctly.

Message #17 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Fri, 02 Sep 2022 13:41:08 +0200

[Message part 1 (text/plain, inline)]

Po Lu <luangruo <at> yahoo.com> writes:

>> The short list is:
>>
>> ❯ xinput list
>> WARNING: running xinput against an Xwayland server. See the xinput man page
>> for details.
>> ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
>> ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
>> ⎜   ↳ xwayland-pointer:39                     	id=6	[slave  pointer  (2)]
>> ⎜   ↳ xwayland-relative-pointer:39            	id=7	[slave  pointer  (2)]
>> ⎜   ↳ xwayland-pointer-gestures:39            	id=8	[slave  pointer  (2)]
>> ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
>>     ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
>>     ↳ xwayland-keyboard:39                    	id=9	[slave  keyboard (3)]
>>
>> Interestingly, that list is the same no matter if I plugged my mouse
>> into my notebook's USB slot or if it is not connected.
>
> Ah, you're using Xwayland.

Actually, I use pgtk so that emacs runs as native wayland client but I
guess that doesn't make a difference here.

AFAIK, X and wayland use libinput for device handling by default and
"libinput list-devices" knows about touchpad AND USB mouse.  Of course I
have no clue if that has any relevance wrt. emacs.

[libinput-list-devices.txt (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

Bye,
Tassilo

Message #20 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Fri, 02 Sep 2022 20:33:05 +0800

Tassilo Horn <tsdh <at> gnu.org> writes:

> Actually, I use pgtk so that emacs runs as native wayland client but I
> guess that doesn't make a difference here.

Hmm, please show what message is displayed when you scroll with the
mouse, after running this:

  (while t (read-event) (message "Device: %s" last-event-device))

> AFAIK, X and wayland use libinput for device handling by default and
> "libinput list-devices" knows about touchpad AND USB mouse.  Of course I
> have no clue if that has any relevance wrt. emacs.

X doesn't necessarily use libinput for input handling.  It all depends
on the input drivers in use.

Most Wayland compositors do, however.

Thanks.

Message #23 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Fri, 02 Sep 2022 14:39:29 +0200

Po Lu <luangruo <at> yahoo.com> writes:

>> Actually, I use pgtk so that emacs runs as native wayland client but
>> I guess that doesn't make a difference here.
>
> Hmm, please show what message is displayed when you scroll with the
> mouse, after running this:
>
>   (while t (read-event) (message "Device: %s" last-event-device))

Device: Virtual core pointer [24 times]

>> AFAIK, X and wayland use libinput for device handling by default and
>> "libinput list-devices" knows about touchpad AND USB mouse.  Of
>> course I have no clue if that has any relevance wrt. emacs.
>
> X doesn't necessarily use libinput for input handling.  It all depends
> on the input drivers in use.
>
> Most Wayland compositors do, however.

I use sway and also have only xf86-input-libinput and
xf86-input-synaptics installed.

When I run "sudo libinput debug-events" and click and scroll with the
USB mouse, I get:

 event6   POINTER_MOTION          +34.209s	 0.00/  0.41 ( +0.00/ +1.00)
 event6   POINTER_BUTTON          +34.209s	BTN_LEFT (272) released, seat count: 0
 event6   POINTER_SCROLL_WHEEL    +35.425s	vert -15.00/-120.0* horiz 0.00/0.0 (wheel)

With the touchpad I get:

-event18  GESTURE_HOLD_BEGIN      +0.041s	2
 event18  GESTURE_HOLD_END        +2.254s	2
 event18  POINTER_MOTION          +3.456s	-0.12/  0.41 ( -1.00/ +3.32)
 event18  POINTER_MOTION          +3.465s	-0.24/  1.60 ( -1.00/ +6.65)
 event18  POINTER_MOTION          +3.475s	-0.51/  1.42 ( -2.00/ +5.54)
 event18  POINTER_MOTION          +3.484s	 0.00/  2.85 ( +0.00/+11.08)
 event18  GESTURE_HOLD_BEGIN      +4.527s	1
 event18  GESTURE_HOLD_END        +4.545s	1

In both cases, event6 and event18 are the devices shown by "sudo
libinput list-devices".

Bye,
Tassilo

Message #26 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Sat, 03 Sep 2022 09:04:36 +0800

Tassilo Horn <tsdh <at> gnu.org> writes:

> Device: Virtual core pointer [24 times]

Thanks.  Please evaluate "(x-gtk-debug)", go to the "General" tab in the
debugger window that will pop up, and show what is displayed under "Seat
0" (you might have to scroll down a bit).

> I use sway and also have only xf86-input-libinput and
> xf86-input-synaptics installed.

Well, since you aren't using X by itself, that information is not very
meaningful.

Message #29 received at 57526 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 57526 <at> debbugs.gnu.org
Subject: Re: bug#57526: 29.0.50; Precise pixel-scrolling works great with
 touchpad but not with mouse wheel
Date: Sat, 03 Sep 2022 09:04:01 +0200

Po Lu <luangruo <at> yahoo.com> writes:

>> Device: Virtual core pointer [24 times]
>
> Thanks.  Please evaluate "(x-gtk-debug)", go to the "General" tab in
> the debugger window that will pop up, and show what is displayed under
> "Seat 0" (you might have to scroll down a bit).

Seat 0                     Pointer, Keyboard
  Wayland Keyboard                  Keyboard
  Wayland pointer                      Mouse
    Axes                                X, Y

>> I use sway and also have only xf86-input-libinput and
>> xf86-input-synaptics installed.
>
> Well, since you aren't using X by itself, that information is not very
> meaningful.

Ah, ok, I've had the impression that the drivers are used by both X11
and Wayland.

Bye,
Tassilo

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