Questions tagged [linux-kernel]
This tag is for questions about the internals of the Linux kernel itself - particularly about use or configuration of kernel modules or drivers.
456
questions
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12 views
Weak Wi-Fi in the Debian distribution
my friends and brothers, since the Debian distribution was installed, stable version, distribution number 15.11.
I saw a weakness in the Wi-Fi. I think that the problem in updating the kernel is that ...
0
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0answers
96 views
Linux Kernel 5.6.0-2 can't access NVMe temperatures through /sys/class/hwmon
I'm using Parrot OS 4.10 64-bit - Kernel Linux 5.6.0-2parrot1-amd64 x86_64.
What i'm trying to do is to read NVMe temperatures through /sys/class/hwmon as this is a new approach implemented from ...
1
vote
1answer
55 views
How does WSL[2] pose limitations on a guest linux system?
As soon as I got WSL2 on my Windows PC, I installed an adapted CentOS 8.2 version. As I explored it, I found that I could read and write in the host's NTFS file system out of the box. It was also ...
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0answers
18 views
Linux Mint 19.3 Kernel 5.7 does not boot with 2nd monitor on docking station
I have on a HP ZBook on docking station + DisplayPort ext. display. Dual-boot Linux Mint 19.3 (Kernel 5.7.0-050700-generic) and Windows 10.
Since the kernel upgrade the NoteBook hangs at boot and ...
0
votes
0answers
13 views
USB devices and PCIe “freeze”, lsusb -t hangs
I have a PC running RaspbianOS (I have to) that has a PCIe card connected to it, the PCIe card has 4 USB controllers for 4 ports(StarTech PEXUSB3S44V).
I have a Sipolar industrial 10 port USB hub ...
0
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0answers
9 views
Does using different kernel versions (dual boot) containing different versions of btrfs with the same btrfs filesystem cause problems?
Didn't find any answer in the official wiki: https://btrfs.wiki.kernel.org/index.php/FAQ
Why would I want to do that?
I want to try another distro along side my currently installed distro.
Where's the ...
0
votes
1answer
23 views
I cannot find headers for linux kernel 5.3.10-arch1-1
I am trying to modify a live arch linux distro to include some proprietary drivers, but I can't seem to find kernel headers for it. I am trying to compile the bcwc-pcie package for facetime HD cameras....
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16 views
Recommended defconfig options for normal use
I have chrooted Debian on a router arm. Now, a lot of packages I try require kernel options that have not been enabled. Obviously I have the firmware source code and the ability to recompile the ...
0
votes
1answer
24 views
Removing old DKMS files fails due to new kernel
I am running Ubuntu 19.10 and due to some problems with the linux kernel 5.3 i switched to 5.4. Now if i want to remove old virtualbox dkms files (virtualbox-6.0.14), dpkg exits with error code 10. ...
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0answers
15 views
Where is the Magic SysRq key on the ASUS P50IJ?
The title is the question. Up to now, I was unable to find it. The proposed solutions I could find on Wikipedia, Wikibooks, superuser.com are not working for me. I have not found any information ...
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0answers
24 views
How to enable ECN marking in IP header in Linux?
Is the ECN marking in the IP header is performed by default in Ubuntu (4.15.x kernel) or should the kernel be recompiled with a special option? I configured a RED ingress queue at an Ubuntu machine, ...
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0answers
31 views
Noisy Screen in linux with kernel 5
As linux kernel was updated to version 5 my laptop screen become noisy, I have same problem with all linux distros. windows works fine so my graphic card is OK. please help me with that if you can.
...
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0answers
13 views
Ethernet Card Drivers in Linux-Libre kernel
I recently installed both Hyperbola and Arch and became thorough with installation process. Didn't like them. Installed parabola linux.
When I finally boot into my fresh install,
ip link
doesn't ...
0
votes
0answers
24 views
Unable to boot 64-bit kernel after installation
My system supports 64-bit architecture and I am able to use debian-buster meant for amd64 architecture separately. Now, I have an os running debian-buster having kernel as "linux-image-686-pae". I ...
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0answers
50 views
New AMD system randomly crashes / kernel panics
About a year ago, I acquired a threadripper based desktop computer, the hardware details of which are:
Samsung 970 EVO Plus 500GB - Solid state drive
ASRock X399M TAICHI (latest firmware)
Gigabyte ...
0
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0answers
27 views
Setting vm.dirty_ratio per cgroup
I was wondering if there is a way to set vm.dirty_ratio per cgroup? I see that the cgroup2 documentation mentions writeback but it seems that it will only use limits imposed by the memory controller ...
0
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0answers
42 views
systemd: Freezing execution in Yocto
We have a legacy device with following configurations:
Chipset Architecture : Intel NM10 express
OS : Yocto warrior
CPU : Atom D2250 Dual Core
Volatile Memory : 2GB DDR3
CPU core : 4
I have ...
2
votes
0answers
121 views
5 GHz AP Mode with Atheros QCA6174A chipset on centOS8
I am trying to set up an 5 GHz access point on a machine with an Atheros QCA6174A-equipped WiFi card running centOS8.
However, all 5 GHz bands are blocked (no-ir flag set) for operation in AP mode (...
2
votes
1answer
34 views
Difference between dpkg and kernel architecture?
I was going through one of the servers and I found a very interesting thing while installing .deb package using Debian.
When I am doing uname -a, I get the following output:
Linux ip-10-20-1-20 4.15....
1
vote
2answers
142 views
Why is there nothing in my conntrack's output?
I have a simple bench:
Linux machine with nf_conntrack module loaded. This machine is between two other hosts (A and B), so it routes traffic between two networks. When I send ping from A to B through ...
1
vote
1answer
70 views
Self Authenticating Usb
Is it possible put a script on a usb that it only allows the contents of a folder to be discovered (or even whole usb to be undiscoverable), unless certain requirements are met?
For example; If I ...
0
votes
1answer
49 views
error while booting custom minimal linux distribution: unable to mount root fs
Recently I followed along an article describing how to build your own minimal linux distribution (Linuxjournal article)
After many tries I finally came to the point where I put my OS on a USB drive. ...
0
votes
0answers
81 views
Regular audio glitches on Linux with Scarlett 3rd gen USB interface
I have a Scarlett 18i20 audio interface running well on a Samsung laptop with Linux Mint 19.3 Tricia and with the 5.0.21-rt16 real time kernel with fully preemptive configuration.
The same set up on ...
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0answers
122 views
CentOS8 overlayfs - operation not supported
The overlayfs kernel module is not working properly in CentOS8. It seems like a bug but maybe is due to improper usage. Is there any solution?
CentOS8.1 uses 4.18.0-147.el8.x86_64 kernel.
To ...
2
votes
3answers
235 views
How to use hwsim, “Module mac80211_hwsim not found in directory” error
I have tried using this guide:
https://wireless.wiki.kernel.org/en/users/drivers/mac80211_hwsim
and did
modprobe mac80211_hwsim
However the output is:
modprobe: FATAL: Module mac80211_hwsim not ...
0
votes
0answers
47 views
running an existing system based on i686 Centos 6 on a 64 bit architecture
I want to run an old Centos 6 based program (i686) on my Core i5 CPU but it doesn't seem to work although I have enabled virtualization. It's a pretty complex system with lots of software libraries ...
0
votes
0answers
82 views
Fedora31 kernel is not loading after a recent upgrade
I just installed fedora31 on my Dell Inspiron 5567 and ran dnf upgrade --refresh which ran normally and updated all the packages including kernel core and kernel modules. But after I restarted the ...
0
votes
0answers
62 views
How can I run a CentOS i686 image on a 64 bit system
I want to run an existing i686 Centos 6 image on a core i3 processor architecture and basically as soon as I boot up,the kernel crashes. How do i resolve this? I did enable virtualization if that ...
0
votes
0answers
73 views
Ubuntu Server Does not Start With kernel 4.15.0-72-generic
I've installed some Ubuntu server 18.04.3 updates earlier today with sudo apt dist-upgrade. After shutting it down, it won't start again showing a black screen with no additional details. Since the ...
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vote
0answers
18 views
How to build crash kernel for my new kernel?
I am trying to collect kernel crash core for my own custom kernel. So far, I have not been able to.
I see that there is a special 'kdump' kernel associated with the original that came with the distro ...
0
votes
1answer
119 views
How do I disable Linux media polling?
I have a USB floppy drive (for reasons, don't ask). When it's plugged into a modern PC with Debian and udev, something is pinging the drive every couple of seconds --- I believe it's looking to see if ...
0
votes
1answer
26 views
how to install kernel module for blk_mq's io schedulers?
I have recently changed single queue to multi queue on my oracle server. This server is oracle linux 6.10 (4.1.12 kernel). I realize there is no any io scheduler for blk_mq alse show the /sys/block//...
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0answers
23 views
which io scheduler is recommended when use the blk_mq block layer with oracle database?
I have oracle Linux 6.10 with 4.1.12 kernel. I have recently moved from the legacy block to the blk_mq block. But all SCSI devices have show io scheduler is none. I have researched but I didn't find ...
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vote
0answers
59 views
Linux Kernel 4.18.0 , 5.0.0 and above and GNOME 3.30.0 and above not loading , why?
I was trying to install KALI Linux 2019.3 on my laptop , it is of Kernel 5.2.9 and GNOME 3.30.2 from a bootable pendrive.
This installations were very easy for me before (i.e. while installing Kali ...
0
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0answers
30 views
Kernel error when using AVerMedia DVD EZMaker 7
I tried to create RCA video input over USB with AVerMedia DVD EZMaker 7 (07ca:c039). The device was recognized right but when I play Video capture in VLC i got kernel error. I had not install driver ...
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0answers
27 views
How to avoid high cpu usage while reading/writing character device?
I need to write a linux kernel driver for a PCIe device with SRAM.
For the first attempt, I've written a driver to access SRAM from PCIe with a character device.
Everything works as expected, but ...
0
votes
1answer
117 views
How to force CentOS to keep showing log messages in serial console after system starts up
I am having this problem with CentOS sending me to the login prompt in serial console and not continuing on showing log messages.
I did setup the serial console:
I edited /etc/default/grub and ...
0
votes
0answers
117 views
How to patch Linux Kernel?
What is the command for patching Linux Kernel RHEL 8? I ran a security check on the RHEL 8 machine using OpenScap which gave me a list of CVE-links and a title with Kernel Security. After trying to ...
0
votes
1answer
362 views
Add kernel-headers to yocto raspberrypi-image
How do I add kernel-headers to the yocto image.
I tried adding the below variable in local.conf
IMAGE_INSTALL_append = " kernel-dev kernel-devsrc kernel-modules"
But I am still unable to see build ...
0
votes
0answers
10 views
After Kernel downgrade in Mageia 6 , I have garbage screen and only ssh works
O.S: Mageia 6
Problem:
I have downgraded the kernel from 4.14.137 to 4.14.10 and now I have garbage screen , nothing is working except ssh
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votes
0answers
11 views
Stop logs from kernel on journal
I am running some custom services on raspberry pi. Due to the small disk space, I want to suppress the following logs that are generated by the kernel.
Sep 20 13:19:03 localhost audit[13403]: AVC ...
0
votes
0answers
137 views
Kernel 5.3 on AMD Chipset
currently I use my own compiled Kernel Since some mounth without any big issues, but since the Release 5.3 some physical Servers with AMD Chipset won't boot anymore, my last Kernel Vers. is 5.2.8 ...
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0answers
78 views
EC2 instance Amzn2 was down for a month. Kernel panic when starting now
I had this fully functional Amazon Linux 2 instance which I had configured into a mail server. During the summer I shut it down. But nothing more than that. When I try starting it now, it only passes ...
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0answers
67 views
The bucket size in TC-HTB
I study the behavior of tc-HTB.
I did a tc setting like the below.
After reading The bucket in tbf, I expect its burst size will be rate / HZ.
sudo /sbin/tc qdisc del dev s1-eth1 root
sudo /sbin/tc ...
0
votes
1answer
103 views
Byte vs bit @ linux TC
I am confused at the usage of 'Byte' and 'bit' when using linux tc
linux tc-tbf said it use 'Byte'
tbf - Token Bucket Filter
Synopsis
tc qdisc ... tbf rate rate burst bytes/cell ( ...
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votes
0answers
49 views
How do I suspend-to-RAM when /sys/power/state doesn't list it and /sys/power/mem_state only contains s2idle?
I'm attempting to configure suspend-to-ram on pop!-os (ubuntu) and am running into issues.
I had questions about using cryptswap and my power state options, which I resolved quite easily by reading ...
1
vote
1answer
499 views
How does Linux reduce physical memory fragmentation in real-time?
The Linux memory allocator works by mapping pages from physical memory to virtual memory. It can either map a contiguous area or sparse chunks from physical memory, to a contiguous area in virtual ...
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0answers
8 views
Getting kernel dump in powerpc mpc8260 process while using kernel version 2.6.24
I am getting following errors in my dmesg regularly even when my all application are killed and drivers being removed.
Continuous dumps are generated by kernel periodically, is there any patch in ...
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0answers
50 views
Full RAM size not recognized by linux kernel after installing RT patch
I use 32-bit PowerPC with the Linux 4.1.8 kernel, and just applied the full RT patch which turned off the CONFIG_HIGHMEM configuration in menuconfig.
Following that my RAM size halved. The kernel ...
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votes
0answers
32 views
symbol link RNDIS config to function fail (ln: configs/c.1/rndis.usb0: No such device)
I would like to make my Linux device to be identified as RNDIS device for Windows 10, and I follow the instructions just like information searched in Internet, but it is fail when doing 'ln -s' as ...
