Questions tagged [udev]
The kernel's device manager, responsible for the contents of /dev.
679
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I can read from /dev/null; how to fix it?
I read the Wikipedia article on /dev/null and was playing around by moving files to /dev/null.
For this I created a test_file and put some contents in it:
$ touch test_file
$ echo "This is written ...
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57
votes
6
answers
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Network interface name changes after update to 15.10 - udev changes
I updated a virtual machine running Ubuntu server 15.04 to the just released new stable 15.10.
There were no apparent problems, but after reboot the machine lost its network connection. lspci showed ...
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votes
10
answers
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What is the correct way to restart udev?
I've changed the name of my eth1 interface to eth0. How to ask udev now to re-read the config?
service udev restart
and
udevadm control --reload-rules
don't help. So is there any valid way except ...
- 1,472
52
votes
11
answers
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What is the best way to configure a Thinkpad's TrackPoint?
The previously useful ThinkWiki pages appear quite outdated. I am trying to permanently change my TrackPoint sensitivity and speed settings and enable middle mouse button scrolling. I have tried ...
41
votes
7
answers
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Android adb no permission
I'm trying to use adb from a Ubuntu(+Cinnamon) machine. The problem is that I get following message from adb devices:
List of devices attached
TA8830OIVO no permissions
Where TA8830OIVO is my ...
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38
votes
7
answers
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views
How to distinguish between identical USB-to-serial adapters?
I use a number of identical USB-to-serial adapters with my laptop (Ubuntu 9.10). The adapters are manufactured by Sabrent and are built around a Prolific PL2303 IC, as shown by lsusb:
Bus 001 Device ...
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31
votes
5
answers
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AdbCommandRejectedException: insufficient permissions for device: user in plugdev group; are your udev rules wrong?
Five days ago I installed Android Studio on a fully updated Ubuntu 2018.04, used the wizard to create an example app, pressed the "Run" button and it ran perfectly on my Android device connected via ...
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votes
5
answers
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Make the zoom slider of Microsoft Natural Ergonomic Keyboard 4000 and 7000 scroll up and down, in 14.04 (Trusty)
I tried to use this tutorial to make scroll switch work on my Microsoft Natural Ergonomic Keyboard 4000. But I face following error:
sudo: /lib/udev/keymap: command not found
I have udev version 204-...
29
votes
6
answers
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Configure udev to change permissions on USB HID device?
I have a USB scale, a USB HID. Currently, when it is plugged in, the permissions only allow the superuser to access it. How can I configure udev to let anybody access this device? I have the vendor ...
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votes
6
answers
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How can I tell linux kernel to completely ignore a disk as if it was not even connected?
Notice
Please scroll down for the answer (it has few points but it is the correct one). The problem is solved by a patch that will be in kernel 3.12.7 and up; I hope it will back-ported to earlier ...
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votes
2
answers
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How do I change the keymap of a single device (Logitech presenter)?
My Logitech R400 presenter sends the following key codes:
keycode 112 (keysym 0xff55, Prior) [page up]
keycode 117 (keysym 0xff56, Next) [page down]
keycode 60 (keysym 0x2e, period)
keycode 71 ...
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20
votes
1
answer
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Automount in 16.04
I need automount for internal and external storages. On boot and on connect. For now I have to click in file manager to make it accessible which is weird for 2016! I know that only udev can be ...
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votes
2
answers
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Prevent a specific USB device from auto-mounting
I want to stop a USB device from automounting in Ubuntu 13.04. For example, when I connect my iPhone 5 to my desktop I am consistently prompted for what I want to do (whether or not I want to erase ...
- 755
19
votes
3
answers
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How are key codes mapped to the appropriate action?
After figuring out how to change the mapping of scan codes to key codes using udev, see this question, I was wondering how those key codes (or events if you will) are mapped to the appropriate action. ...
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votes
3
answers
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How to get Bus and Device relationship for a /dev/ttyUSB
I need to write an script for restart USB dongles. I have all tools but I can't link my /dev/ttyUSBx to physical BUS and DEVICE. An issue is that I have three dongles with the same id vendor and id ...
17
votes
5
answers
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How do I hide / remove a partition from the Nautilus left panel?
I have a luks setup with encrypted partition. And I don't want everyone on my computer to see that I have such partition. Unfortunately it shows up in the nautilus "devices" panel as "Encrypted ...
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17
votes
4
answers
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views
udev rules seem ignored; can not prevent modem manager from grabbing device
I am trying to prevent modem manager from running when I plug my cell phone into a USB port.
I have tried to add a custom rule with udev, but my custom rules seem ignored. I created a file /etc/udev/...
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votes
6
answers
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views
How to make keyboard backlight Fn buttons work in Samsung Series 9?
I've just installed Ubuntu 12.10 on my Samsung 900X4C. However, I can't get the keyboard backlights to work.
I added the keymaps as per community docs - Samsung Series 9 (section Function Keys). But ...
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votes
1
answer
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For pulseaudio what does tsched do (and what are the defaults)?
If I modify /etc/pulse/default.pa and change this line:
load-module module-udev-detect
to:
load-module module-udev-detect tsched=0
I am clearly disabling tsched. Similarly if I change the line to,
...
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16
votes
2
answers
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views
Use of Predictable Network Interface Names with alternate kernels
Almost constantly, I use kernels from the Ubuntu kernel PPA, or kernels I have compiled myself, using the Ubuntu kernel configuration.
The problem is when I am using the stock kernel it seems to ...
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15
votes
2
answers
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Run script when monitor is connected
I am trying to run a script located in usr/local/bin/ when I connect an external monitor to my laptop. I have tried to add a new udev rule but that did not work. I created a new file in /etc/udev/...
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1
answer
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views
Only use Mass Storage devices on a selected USB port - how?
On a given USB port, I only want to accept USB Mass Storage capabilities, and nothing else. No HID devices, no Bluetooth adapters, no RS232 converters, nothing. Is there a way to do this e.g. using ...
14
votes
2
answers
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Use of Yubikey Neo for login 2FA and lock screen
I want to use my Yubikey Neo to login to Ubuntu 14.04. In addition, it would be convinient if the screen is locked automatically everytime I unplug the Yubikey.
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1
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How do I set executable permissions on a removable drive?
I'm using Ubuntu 10.10 and using a usb drive but I'm finding that I can't chmod any programs on the drive to +x. It is being auto-mounted by Gnome (using udev, I think?) so I imagine the problem is a ...
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13
votes
1
answer
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Assign webcam to a specific /dev/video#
I have three webcams on my Ubuntu server 14.04.
The output of lsusb:
Bus 006 Device 002: ID 0bda:8153 Realtek Semiconductor Corp.
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus ...
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13
votes
3
answers
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views
What happens under the hood when an USB drive is inserted?
Some systems use udev / pmount to automatically mount thumbdrives. How is that solved in Ubuntu (specifically, Ubuntu 12.04)? Apparently, neither the pmount package nor the corresponding udev rules ...
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13
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Alert the user when they unsafely unplug an USB thumb drive
Users repeatedly complain about lost data on USB thumb drives after they unplugged them without unmounting. We run Ubuntu 14.04 LTS on our machines. Auto-mounting is enabled.
As I am tired of ...
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votes
4
answers
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views
Auto-switch audio to HDMI when HDMI monitor/receiver plugged into laptop
I have a laptop with an HDMI port. While we're homeless and staying with friends I've been plugging it into their surround sound receiver with an HDMI cable. To get sound working I have to open up the ...
Oli♦
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USB sticks not accessible & system hangs at shut-down: related to older hardware?
Please notice the three updates at the end of the post.
Original problem
I installed Lubuntu 14.04.1 on an older Acer Travelmate 4500 using the forcepae option and adjusting upowerd.py according to ...
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votes
3
answers
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views
How to disable udev net rule generation?
In our cloud, we generate MACs with the prefix 2c:c2:60 for instances.
When we re-use an instance, or duplicate it, the new copy gets another MAC address.
When the new copy boots, the NIC gets the ...
- 533
11
votes
3
answers
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views
Package udev is not configured yet
Today I decided to upgrade my Ubuntu Desktop 14.04 LTS to 16.04.
Unfortunately, the upgrade process crashed on the way, no idea why.
When I reboot I am left only with a black screen, if I choose the ...
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4
answers
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How can I create a new socket in /dev?
I want to create a new socket file in /dev. Does the way to get it is adding a new rule to udev?
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3
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How to detect touchscreen devices from a script?
I'm looking for a reliable way to detect if a laptop has a touchscreen device from a script. I know I can parse the output of:
$ xinput --list
⎡ Virtual core pointer id=2 [...
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What is the difference between /dev/tty* and /dev/bus/usb/001/002?
When I plug in a device that uses the LUFA USB framework (or any USB<->serial peripheral), Ubuntu creates a /dev/ttyACM* device file. It also creates a /dev/bus/usb/001/002 file and a /sys/bus/usb/...
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2
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How can I properly create /dev/dvd?
Certain programs look for /dev/dvd by default to find DVDs. When I first boot my computer without a DVD inserted, /dev/dvd exists and points to the correct place (/dev/sr0). However, when I insert a ...
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votes
1
answer
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views
How do I make noatime mounts default?
I'm making an Ubuntu derivative, and I want to make noatime the default mount option for all filesystems (instead of relatime which is default in Ubuntu).
There seems to be a boolean default_relatime ...
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votes
3
answers
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views
Why do my udev rules run if I use udevadm trigger, but NOT at boot time?
I'm having trouble with udev rules not running. Here's an example:
I have a rule /etc/udev/rules.d/99-test.rules which contains:
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x8086", RUN+="/sayhi"...
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Ubuntu 17.04: how to rename a USB network interface based on Path? (NOT based on MAC)
No, this ain't a duplicate of Why doesn't my Wi-Fi adapter show up as wlan0 in 16.04?, as this explains how to restore eth0 naming, but not how to individually name a specific interface.
I don't ...
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2
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How to execute C++ program whenever a USB flash drive is inserted
I have a C++ program that accesses USB pen drives/flash drives. It works for currently inserted flash drive. A normal C++ program doesn't execute until we run it. But I wanted the program to run ...
- 437
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votes
4
answers
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beep not working since upgrade to 20.04.1 LTS
I've just finished upgrading to Ubuntu Server 20.04.1 LTS, and so far, only one issue has come up: When run as user, the beep command returns
beep: Error: Could not open any device`.
Running sudo ...
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votes
2
answers
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How to detect insertion of DVD disc?
In particular, how to catch it for the purposes of automounting the DVD filesystem?
Update in response to Oli's answer:
udev seems to be able to detect the insertion of DVD, as demonstrated by ...
- 255
9
votes
2
answers
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multiple /dev/video devices for 1 camera causing issue with udev rules
Since upgrading from ubuntu 16.04 (kernel 4.15.0-60-generic) to 18.04 (kernel 5.0.0-27-generic) v4l now returns multiple /dev/video devices per physical device. This causes issues when trying to map ...
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votes
3
answers
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Rebuild accidentally deleted /dev
How to rebuild /dev/ on an Ubuntu lucid where everything in /dev/ were accidentally deleted?
MAKEDEV std and MAKEDEV pty aren't enough, which isn't surprising on a system using udev.
I haven't ...
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votes
1
answer
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Udev webcam rule read, but not respected?
I have two usb-webcams on them machine, but at boot they sometimes switch /dev/video number.
The solution to this problem seems to be creating a new udev rule. I have added this rule in/etc/udev/rules....
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8
votes
1
answer
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How does automated hotplug mounting work?
I was reading a bit about gnome-mount, HAL, udev, etc. It left me with a couple of faint ideas how mounting a hotplug device might work in the latest Ubuntu release.
Could someone give a detailed ...
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3
answers
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How to allow software access to any USB devices?
I have a libusb-based program that can't open USB devices on a freshly installed Ubuntu because it lacks permissions.
This solution will probably work for me, but it requires manually specifying ...
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3
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user in plugdev group; are your udev rules wrong or error: insufficient permissions for device: udev requires plugdev group membership?
I encountered error like "(user in plugdev group; are your udev rules wrong?", After googled, I found some key refers:
Ref 1. Set up a device for development from Android Developer;
Ref 2. Solved: ...
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votes
1
answer
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Long running udev script on Ubuntu 16.04
On Ubuntu 14.04 I have a long running bash script with a simple udev rule that works perfectly like this:
ACTION=="change", SUBSYSTEM=="block", RUN+="/opt/script.sh"
On Ubuntu 16.04 things aren't ...
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votes
1
answer
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views
How create a udev rules to disable one of Android devices?
I have an HTC Android phone.
Every time I connect it to computer I get a message:
Android Phone: Could not open MTP device "[usb:002,003]"
The numbers may be different. But the phone connects ...
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8
votes
3
answers
8k
views
My custom udev hwdb rule doesn't work
I'm using ubuntu 14.04 installed in EFI Mode, I tried to write simple udev rule which for all external USB keyboards will map capslock for escape. I use a lot of vim and plug and unplug keyboards ...
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