- Libinput Gestures 2 Finger Swipe Tricks
- Libinput Gestures 2 Finger Swipe Numb
- Libinput Touchscreen
- Libinput Gestures 2 Finger Swipe Emoji
libinput uses the touchpad pressure values and/or touch size values todetect wether a finger has been placed on the touchpad. This isInformation provided by the kernel and combines with a libinput-specific hardwaredatabase to adjust the thresholds on a per-device basis. libinput usesthese thresholds primarily to filter out accidental light touches butthe information is also used for some Palm detection.
?️ Update Install LIBINPUT-GESTURES for Debian/Ubuntu/Linux Mint 19.3 also work ?️ You must: - be a member of the input group to have permission to read the touchpad device. Thus, if a user puts down a fourth finger during a three-finger swipe gesture, libinput will end the three-finger gesture and, if applicable, start a four-finger swipe gesture. A caller may decide that those gestures are semantically identical and continue the two gestures as one single gesture.
Pressure and touch size thresholds are not directly configurable by theuser. Instead, libinput provides these thresholds for each device wherenecessary. See Debugging touchpad pressure ranges for instructions on how to adjustthe pressure ranges and Debugging touch size ranges for instructions onhow to adjust the touch size ranges.
![Libinput Gestures 2 Finger Swipe Libinput Gestures 2 Finger Swipe](https://techwiser.com/wp-content/uploads/2019/07/install-libinput-tools.png)
Libinput-gestures-setup autostart libinput-gestures-setup start. Once done, the libinput-gesture will map the three-finger swipe up gesture to go to Desktop and the three-finger swipe down on the desktop to go to the previous app. You can also pinch in and out to reach the app overview menu. Most Linux distributions don't support swipe gestures by default, particularly three finger swipes for things like swiping left and right for application back and forward (i.e.
Information provided by the kernel¶
The kernel sends multiple values to inform userspace about a finger touchingthe touchpad. The most basic is the
EV_KEY/BTN_TOUCH
boolean eventthat simply announces physical contact with the touchpad. The decision whenthis event is sent is usually made by the kernel driver and may depend ondevice-specific thresholds. These thresholds are transparent to userspaceand cannot be modified. On touchpads where pressure or touch size is notavailable, libinput uses BTN_TOUCH
to determine when a finger islogically down.Many contemporary touchpad devices provide an absolute pressure axis inaddition to
BTN_TOUCH
. This pressure generally increases as the pressureincreases, however few touchpads are capable of detecting true pressure. Thepressure value is usually related to the covered area - as the pressureincreases a finger flattens and thus covers a larger area. The rangeprovided by the kernel is not mapped to a specific physical range andoften requires adjustment. Pressure is sent by the ABS_PRESSURE
axisfor single-touch touchpads or ABS_MT_PRESSURE
on multi-touch capabletouchpads. Some devices can detect multiple fingers but only provideABS_PRESSURE
.Some devices provide additional touch size information throughthe
ABS_MT_TOUCH_MAJOR/ABS_MT_TOUCH_MINOR
axes and/orthe ABS_MT_WIDTH_MAJOR/ABS_MT_WIDTH_MINOR
axes. These axes specifcythe size of the touch ellipse. While the kernel documentation specifies howthese axes are supposed to be mapped, few devices forward reliableinformation. libinput uses these values together with a device-specificDevice quirks entry. In other words, touch size detection does not workunless a device quirk is present for the device.Debugging touchpad pressure ranges¶
This section describes how to determine the touchpad pressure rangesrequired for a touchpad device and how to add the requiredDevice quirks locally. Note that the quirk is not public API and maychange at any time. Users are advised to report a bugwith the updated pressure ranges when testing has completed.
Use the
libinputmeasuretouchpad-pressure
tool provided by libinput.This tool will search for your touchpad device and print some pressurestatistics, including whether a touch is/was considered logically down.Note
This tool will only work on touchpads with pressure.
Example output of the tool is below:
The example output shows five completed touch sequences and one ongoing one.For each, the respective minimum and maximum pressure values are printed aswell as some statistics. The
tags
show that sequence was consideredlogically down at some point. This is an interactive tool and its output maychange frequently. Refer to the <i>libinput-measure-touchpad-pressure(1)</i> manpage for more details.By default, this tool uses the Device quirks for the pressure range. Tonarrow down on the best values for your device, specify the ‘logically down’and ‘logically up’ pressure thresholds with the
--touch-thresholds
argument:https://yfwec.over-blog.com/2020/11/how-to-open-rar-files-free-software.html. Interact with the touchpad and check if the output of this tool matches yourexpectations.
Note
This is an interactive process. You will need to re-run thetool with varying thresholds until you find the right range foryour touchpad. Attaching output logs to a bug will not help, onlyyou with access to the hardware can figure out the correctranges.
Once the thresholds are decided on (e.g. 10 and 8), they can be enabled withDevice quirks entry similar to this:
The file name must be
/etc/libinput/local-overrides.quirks
. TheThe first line is the section name and can be free-form. The Match
directives limit the quirk to your touchpad, make sure the device namematches your device’s name (see libinputrecord
’s output). The dmimodalias match should be based on the information in/sys/class/dmi/id/modalias
. This modalias should be shortened to thespecific system’s information, usually system vendor (svn)and product name (pn).Once in place, run the following command to verify the quirk is valid andworks for your device: Boom 3d 1 3 4 0.
Replace the event node with the one from your device. If the
AttrPressureRange
quirk does not show up, re-run with --verbose
andcheck the output for any error messages.If the pressure range quirk shows up correctly, restart X or theWayland compositor and libinput should now use the correct pressurethresholds. The Helper tools can be used to verify the correctfunctionality first without the need for a restart.
Once the pressure ranges are deemed correct,report a bug to get the pressure ranges into therepository.
Debugging touch size ranges¶
This section describes how to determine the touchpad size rangesrequired for a touchpad device and how to add the requiredDevice quirks locally. Note that the quirk is not public API and maychange at any time. Users are advised to report a bugwith the updated pressure ranges when testing has completed.
Use the
libinputmeasuretouch-size
tool provided by libinput.This tool will search for your touchpad device and print some touch sizestatistics, including whether a touch is/was considered logically down.Note
This tool will only work on touchpads with the
ABS_MT_MAJOR
axis.Example output of the tool is below: Roblox player.exe installer.
The example output shows five completed touch sequences. For each, therespective minimum and maximum pressure values are printed as well as somestatistics. The
down
and palm
tags show that sequence was consideredlogically down or a palm at some point. This is an interactive tool and itsoutput may change frequently. Refer to the <i>libinput-measure-touch-size(1)</i> manpage for more details.By default, this tool uses the Device quirks for the touch size range. Tonarrow down on the best values for your device, specify the ‘logically down’and ‘logically up’ pressure thresholds with the
--touch-thresholds
arguments as in the example above.Libinput Gestures 2 Finger Swipe Tricks
Interact with the touchpad and check if the output of this tool matches yourexpectations.
Note
![Libinput three finger drag Libinput three finger drag](https://www.omgubuntu.co.uk/wp-content/uploads/2018/09/touchpad-gestures-on-ubuntu.png)
Libinput Gestures 2 Finger Swipe Numb
This is an interactive process. You will need to re-run thetool with varying thresholds until you find the right range foryour touchpad. Attaching output logs to a bug will not help, onlyyou with access to the hardware can figure out the correctranges.
Once the thresholds are decided on (e.g. 10 and 8), they can be enabled withDevice quirks entry similar to this: Nikai microwave oven user manual.
The first line is the match line and should be adjusted for the device name(see evemu-record’s output) and for the local system, based on theinformation in
/sys/class/dmi/id/modalias
. The modalias should beshortened to the specific system’s information, usually system vendor (svn)and product name (pn).Once in place, run the following command to verify the quirk is valid andworks for your device:
Replace the event node with the one from your device. If the
AttrTouchSizeRange
quirk does not show up, re-run with --verbose
andcheck the output for any error messages.Libinput Touchscreen
If the touch size range property shows up correctly, restart X or theWayland compositor and libinput should now use the correct thresholds.The Helper tools can be used to verify the correct functionality first withoutthe need for a restart.
Libinput Gestures 2 Finger Swipe Emoji
Once the touch size ranges are deemed correct, Reporting bugs “report abug” to get the thresholds into the repository. Waiting list 1 2 3 – create countdown timers printable.