Questions tagged [events]
The events tag has no usage guidance.
59
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Can I simulate power supply getting offline using udev or in other ways under Linux?
I have created the rule /etc/udev/rules.d/80.power.rules:
SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="/root/test.sh"
Then I execute the command ...
- 346
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41
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Detecting system wake event using Dbus in linux
I wanted to perform some task in my application, as soon as the application wakes from sleep mode. To do that I wanted to detect the wake event in my application. I m detecting the sleep event in my ...
- 101
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1
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856
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What could cause a missing mouse scroll event just after reversing scroll direction?
I'm using Ubuntu 22.04.2 on an x86_64 system, with Xorg and libinput.
I have a Logitech MX Master mouse (the first model), and I've noticed some unusual behaviour with scrolling. The mouse has a free-...
- 171
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1
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100
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Verifiy if a mouse is defective
I have only Linux machines (Ubuntu 22.04) and I've just received a 3D Connexion CadMouse Pro that officially does not support Linux. But I guess it's about the control software, as an HID mouse it ...
- 733
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549
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/dev/input/event doesn't report keys being pressed
I have an usb keyboard connected to a linux box.
I need to capture all keys that have been pressed and released.
My keyboard n-key rollover meaning that it doesn't have limits on number of ...
1
vote
1
answer
276
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Not understanding the use of EVIOCGRAB for touchscreen devices
I am looking at a userspace library which handles touchscreen events from the Linux kernel.
The following line of code, I can't understand what it does. What is the purpose of EVIOCGRAB when passed to ...
- 1,171
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How to access gpio-keys from a shell script
In my embedded linux system, I defined some GPIOs as keys in the device tree so I can use them as keys in my application. This works fine so far.
Now I want to add an early startup script to respond ...
- 13.5k
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438
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Interpreting variations in LOCal timer interrupts number
Running a given workload in different CPU isolation (IRQs & processes) configurations, I do not observe significant differences among values (grand total) reported in /proc/interrupts & /proc/...
- 8,249
2
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914
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get event when user has selected a text in any window in X11
I want to write an app that shows a popup-menu after a user has selected a text in any window in Linux (debian based).
Mac users may know "PopClip" (https://pilotmoon.com/popclip/) and as I ...
- 31
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1
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1k
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Is it possible to dynamically update systemd-timer's onCalendar?
sytemd-timer has a feature "onCalendar" using which we can execute a script on points of time (on calendar).
Is it possible to dynamically (programmatically) update or mutate that field?
For ...
- 1,060
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272
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Side mouse buttons doesn't work
I switched to Pop! OS, but side mouse buttons doesn't work.
On windows they were button 4 & 5, but here I used xev and it turns out button 4 & 5 were assigned to the scroll wheel. When I ...
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2
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1
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1k
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script with `read` in bash while loop causing high CPU usage when run as a systemd service
I wrote a script to run specific actions conditional on input events informed by an event monitor, which looks something like
$ cat script.sh
-----------------------------------------------------------...
- 148
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1
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404
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Linux on-exit (Ctrl-C) action
This is an interesting scenario and I'm relatively new in writing shell scripts. I have a case where I want the user to enter a password at a prompt. That works fine.
The PROBLEM is if the user ...
- 1,395
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How would a GUI widget differentiate between the semantic- and absolute direction of a touchpad event?
I've recently been trying out Ubuntu 20.10 with Gnome desktop on Wayland, using a touchpad that supports precision scrolling, i.e. which does not emulate a mousewheel.
After enabling natural scrolling ...
- 521
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266
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How to proxy a keyboard though a Raspberry PI?
I have a keyboard that is plugged into a Raspberry Pi and the Raspberry Pi is plugged into my Mac. The Raspberry Pi is configured to act as a USB Keyboard and this is how my Mac sees the Raspberry Pi, ...
- 111