Questions tagged [devices]

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2answers
262 views

How can I tell which of these video devices is a webcam?

$ ls -ltrh /dev/video* crw-rw----+ 1 root video 81, 1 Mai 4 00:17 /dev/video1 crw-rw----+ 1 root video 81, 0 Mai 4 00:17 /dev/video0 This is a laptop so I guess one is the built in camera, and one ...
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0answers
28 views

Faced problem to activate Bluetooth and search devices with version 21.04

I faced a problem with Bluetooth on version 21.04. The below message on the screen doesn't allow me to activate Bluetooth and search devices. This is the error plug in a dongle.
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0answers
38 views

Installing Device Drivers for TP-Link TL-WN725N Wireless Adaptor

I have purchased a TP-Link TL-WN725N wireless adapter and require to install its device driver to get it working. After perusing the product information sheet, I see that my current version of the ...
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0answers
35 views

how to prevent ubuntu to activate all available/discovered LVM VG/LV devices at startup?

I'm using Ubuntu 20.04 LTS. I have two LVM Volume Group (VG) named ubuntu and tools. ubuntu VG contains all needed Logical Volume (LV) as boot root home swap tools VG is a secondary VG containing ...
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0answers
44 views

Raspberry PI 4+Ubuntu Mate works with IR remote shield?

I have already tested my IR remote shield in a Raspberry PI 3B and works ok (with Raspbian + Lirc). Now I want to make it run in my raspberry pi 4 with Ubuntu Mate installed. Here is my uname -a : ...
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0answers
26 views

understanding df -h output for use with dd

What do the different sda devices represent in this df -h output? Aren't /var /usr /opt all apart of / (the root directory)? Does this mean those directories are partitioned differently? -bash-3.2$ df ...
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0answers
72 views

How can Rhythmbox regocnize iPhone in order to manage music?

I'm running 20.04, which comes with libimobiledevice. When I plug in my iPhone, it is mounted successfully, and I can see it in the File Browser. However, when starting Rhythmbox and checking for new ...
0
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0answers
41 views

Can you create a virtual /dev/video that contains either /dev/video0 or /dev/video1, based on which is available?

I'm using v4l2 to create a virtual video device /dev/video0 into which I feed ffmpeg stream (from a DSLR camera). I also have the default laptop webcam in /dev/video1. When the DSLR is on, I can see a ...
0
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0answers
17 views

USB Port recognition fails after some seconds

There are tons of posts around this topic but mine is somehow unique I found. PROBLEM Device 1: When plugging in any USB storage device like external hard drive, USB stick, card reader or phone, the ...
0
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3answers
85 views

No gnome-desktop on the LAPTOP screen after connecting a second monitor(hdmi)

So two things occurred: I have recently near-nigh killed the system by deleting python3 (i had too many versions of it installed), but i did manage to reinstall it and the gnome-desktop since then ...
0
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1answer
65 views

how can I read from a USB device without knowing the device name?

I have an Arturia, MiniLab, it is a serial, non block device. I would like to read keypresses from the device, but I cant figure out where the /dev/device is that I should read key presses from. I ...
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0answers
171 views

External hard disk not mounted and not seen when plugged to Ubuntu

Suddenly Ubuntu stopped recognizing my external USB drive HDD, this is my dmesg output: [ 2341.271570] usb 2-2: new SuperSpeed Gen 1 USB device number 43 using xhci_hcd [ 2341.293118] usb 2-2: New USB ...
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0answers
28 views

How to use seccomp with udev correctly?

I am trying to block devices via udev. I added some code which wraps this service and eases its usage. Is using seccomp necessary to this service in order to limit the system calls used by the devices ...
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0answers
23 views

Setting USB Hub device authorized flag to 1 does not work

I have a USB Hub listed under /sys/bus/usb/devices as 1-2. It's the only device issuing echo 1 > /sys/bus/usb/devices/{device} does not work (returns bash: echo: write error: Invalid argument). ...
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0answers
104 views

Ubuntu 20.04 Bluetooth problem

In Ubuntu 20.04 on a Dell V-13 Bluetooth Manager correctly instaled but no bluetooth device detected. No Bluetooth Adapter is listed. Help appreciated
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0answers
263 views

External webcam device not found by some programs after upgrade to Ubuntu 20.04

Purely as the result of the upgrade from Ubuntu 16 to 20.04LTS, my external webcam is not found by some software any longer. Situation uname -r says 5.4.0-54-generic (so this answer should not apply) ...
0
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0answers
173 views

Refresh of udev rules directory does not work

I try to edit, remove and create rules in udev. For some reason, those rules are not activated, even when I try the known solutions- Udevadm control --reload-rules Udevadm trigger Just reset the the ...
0
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0answers
23 views

How to enforce Udevrules for pre boot connected devices

I would like to investigate via udev rules connected devices. I can monitor devices when they are connected perfectly, however if they are connected before the boot, the rules are not enforced on them....
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0answers
307 views

Ubuntu 18.04.4 remove lvm devices in /dev/mapper without vg and lv info

These day,I found the one cpu load high $sudo top %Cpu0 : 7.0 us, 0.0 sy, 0.0 ni, 93.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 10.6 us, 0.0 sy, 0.0 ni, 0.0 id, 89.4 wa, 0.0 hi, 0.0 si,...
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0answers
14 views

Mapping devices to specific locations?

I have a DVB-S PCIe card and several USB DVB-T tuners. Is there any way to make the devices show in the same "order"? The order changes with reboots and messes with my software configs. ...
0
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0answers
687 views

dev/ttyacm0 does not exist despite showing up in dmesg

I'm trying to run rosserial with a teensy 3.6, but am getting the following error [ERROR] [1603751770.005130]: Error opening serial: [Errno 2] could not open port /dev/ttyACM0: [Errno 2] No such file ...
2
votes
2answers
180 views

Block device full - how do I clear space

I'm a relatively basic user, using the Ubuntu terminal for Windows. I have a failing deployment caused by a lack of disk space on the VM I'm connected to in the terminal: df -h Filesystem Size ...
2
votes
1answer
133 views

What are the device numbers reported by lsof?

What are the device numbers reported by lsof? I read the man page, Identify devices from lsof, and this. Still I do not know what is its meaning. In particular, for this case, what can I infer from ...
1
vote
1answer
50 views

Grant writing permission to /snap devices

I installed blender with snap and I want the app to use blender's numix-circle-icon so I tried to replace /snap/blender/47/blender.svg but I have this error with sudo: File systeme is only readable I ...
0
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0answers
28 views

ubuntu linux Ubuntu 20.04.1 LTS microphone

I have Ubuntu Ubuntu 20.04.1 LTS and my microphone does not work.Can you help me in that? tu
2
votes
1answer
223 views

Problem with SD Card Read-only

I have problem with a SD card which is Read Only (it's not due to the switch of the card adapter, I've already checked). I format the SD card with 'Disks' but the card results to be as "Read-only&...
1
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0answers
76 views

Why are there so many audio output devices?

My system has multiple audio output devices avaible (built-in monitor speakers connected via display port, Corsair headset with USB receiver and speakers connected with aux). In my output devices, ...
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0answers
27 views

I am unable to connect my Bluetooth headset to the laptop that has Ubuntu version 20.04

I used the following commands to uninstall blueman and install it once again sudo apt remove blueman sudo apt autoremove //removed sudo apt install blue and -y && blueman-manager //my python ...
1
vote
1answer
478 views

RTL8821CE device is not recognized

My computer does not recognize the network devices, right now I am using a network cable, but when I go to configuration / networks only the cable appears,it does not recognize any device, the drivers ...
1
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1answer
17 views

Can access WIndows partition in GUI but struggling through terminal

I have Windows and Ubuntu installed. I'm today cleaning up my home directory and noticed there is a downloaded file I want to move to my Windows partition. I don't want to use GUI. I know it works. ...
6
votes
2answers
997 views

What is the difference between Filesystem and “Extended Partition” in Disks?

I am struggling to understand the output from the "Disks" program. Here I see two different partitions, both pointing to the same disk space. One is devices /dev/sda3 (highlighted) and the other is /...
1
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0answers
323 views

Added RAM memory is not recognized : dmidecode shows no added new RAM info and free command does not increase the free size

Environment Info Ubuntu ver : Ubuntu 18.04.3 LTS Mother Board : SuperMicro C9X299-PG300F Initial RAM size : Total 16GB, one 16GB card at one slot RAM type : MTA16ATF2G64AZ-2G6E1 Current status I ...
0
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1answer
3k views

Missing ipmi Device (Remote Access Card) / ipmitool Failue: Could not open device at /dev/ipmi0 … No such file or directory

I recently bought second-hand a HP Proliant N36L Microserver, and I'm having trouble configuring it for remote access on Ubuntu Server 20.04 LTS. It came with a HP Remote Access card, but when I try ...
3
votes
1answer
2k views

What's the difference between /dev/sg0 and /dev/sr0?

$ uname -srvmpio Linux 5.4.0-31-generic #35-Ubuntu SMP Thu May 7 20:20:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux $ sudo cdrecord -inq Device was not specified. Trying to find an appropriate drive... ...
0
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0answers
225 views

Ubuntu 20.04 - Audio Output Device Disappeared - no DispayPort/HDMI (Built in) Available

I'm using Ubuntu 20.04 on a multi boot system. I have a Lenovo m93p Tiny attached to a TV via the DisplayPort adapted to an HDMI connection to a Samsung TV. The sound works fine on all the other ...
0
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0answers
35 views

Unable to connect second monitor on ubuntu 20.4

I have tried the steps: Open the Activities overview and start typing Settings. Click on Settings. Click Devices in the sidebar. Click Displays in the sidebar to open the panel. In the display ...
1
vote
3answers
216 views

How can I prevent a third party software to gather data from my device?

For work purposes I have to use a not open source software that collects and sends to the producer MAC address, other device IDs and other hardware datas (from its privacy policy, which is not very ...
0
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0answers
22 views

What Linux utility enables knowing devise is running or shut?

I'm seeking any solution to detect hardware instances which are in or out of operation (till restart) in Linux distro like Ubuntu 18.04. Essentially, what terminal-built or loadable utility serves to ...
1
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3answers
3k views

GPIO for Raspberry PI GPIO Group

I grabbed the image for Ubuntu on Raspberry PI over here https://ubuntu.com/download/raspberry-pi loaded a L928N python program via a virtualenv as the ubuntu user and got an error. Did some digging ...
0
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2answers
38 views

Ubuntu wierd sound of connected device

On my fresh Ubuntu 18.04 I keep hearing sound that usually appears while connecting usb stick or something. Like something was connecting and disconnecting all the time, every few minutes. What do I ...
3
votes
1answer
2k views

Using DSLR camera as a webcam

I am trying to use my Canon DSLR as a webcam, on an Ubuntu machine. The camera does not show up as /dev/video*. The camera shows up in hwinfo --usb: 19: USB 00.0: 10f01 WebCam [Created at usb.122] ...
2
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0answers
305 views

SSD not found anymore (not listed by parted, nor lsblk etc, but bus found in lshw)

EDIT: I think the SSD is juste dead, I bought a new one, all is fine, I'll see if I can get the data back (unlikely imo) I have a dual-boot Windows 10 / Ubuntu 18.04 on my laptop (HP Omen 15-5000 NF) ...
4
votes
0answers
235 views

Webcam Renaming

I'm running Ubuntu 18 and I've got a dual webcam setup for Zoom. They're both Logitech c615 cameras and the fact that the system is giving them the same default name is confusing. I'd like to change ...
1
vote
1answer
122 views

Mouse and Touchpad Glitch

For Ubuntu 19.10 Users: When I go into Settings ⇾ Devices and click on “Mouse and Touchpad”, the window starts to flicker and glitch out. It is toggling between the two menu states shown in the ...
1
vote
1answer
141 views

How to understand which device is which in the /dev directory

I am new in UNIX/Linux programming. I need a clear reference of each file in /dev directory and which file refers to which devices. I have read many posts but its not only confusing but also sharing ...
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0answers
36 views

How to list device activity

I want to list or display all the activity generated by an external device. For example, all that I copied to and from it with detailed information: size, places, etc.
0
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1answer
210 views

How to disable a mobile broadband device

I am using a dell latitude E5250 which comes with support for a SIM card. On bootup I get a message "The mobile broadband device cdc-wdm0 requires a SIM PUK before it can be used" I dont need this and ...
1
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0answers
279 views

Can't find /dev/video on MacBook

I installed ubuntu 19.10 on my MacBook and tried to use the integrated webcam of MacBook, but when using ls /dev/video* I can't get any device. On my other laptop I can get /dev/video0 which is the ...
0
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2answers
213 views

How do I list all devices and learn how to enable/disable them in Ubuntu 19.10?

I'm looking for a way to see all the devices (e.g. touchpad etc.) and to enable/disable them.
0
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1answer
210 views

18.04: USB optical drive not recognized on Gigabyte Z390

I have just installed 18.04 on a custom built new htpc with a Gigabyte Aorus Z390 I mainboard and would like to connect my external cd-drive via a USB type-C port. My optical drive only has USB-output ...

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