Questions specifically about Linux, as opposed to Unix-like systems in general, or to questions about a specific distribution or program.

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6
votes
0answers
136 views

Creating a virtual microphone

I run a CentOS Server with VNC enabled and some services require a microphone to work properly, but it doesn't have to be used for recording, just a microphone device available. So I was wondering if ...
5
votes
0answers
162 views

Why are cgroups mapped differently on these two systems by systemd

I have two systems, both running customized variants of OpenSuSE 12.2 (Mantis), both running exactly the same kernel. I get two very different outputs of /proc/self/cgroup or /proc/$$/cgroup on the ...
4
votes
0answers
44 views

Linux kernel dropping custom keyboard scan codes

I have a vintage IBM 122 key model M keyboard that I am adapting for use on a modern computer. I am using a Teensy 2.0 to do the encoding and to handle the USB side of things. I borrowed the firmware ...
4
votes
0answers
57 views

Why does hdparm see two different values for the size of a drive?

I have a 1 TB drive attached via USB. It contains an LVM physical volume filling the entire device (without any partition table). When I tried to extend a logical volume by using the entire PV, the ...
4
votes
0answers
153 views

Is there a tool(!) to list assigned subuid and subgid values for users?

The question is basically in the title. usermod -v (--add-sub-uids) and usermod -w (--add-sub-gids) can be used to manipulate the subuid and subgid ranges for a user account, but there appears to be ...
4
votes
0answers
1k views

How do I find out the device node corresponding to my device in SuSE 8?

I'm forced to work with a bunch of point-of-sale systems running SuSE 8. They are my client's computers. We are stuck dealing with these old systems until they get to upgrade their whole fleet to SLE ...
4
votes
0answers
411 views

Can capabilities be used in scripts without setcap'ing the interpreter binary?

Right now I'm using cap_net_bind_service MY_USERNAME in /etc/security/capability.conf. Now I just need to set cap_net_bind_service+i on the interpreter of my favouite scripting language to be able to ...
4
votes
0answers
175 views

Socksifying a qemu-kvm using tsocks

I'm trying to socksify a qemu-kvm using tsocks, but I have no success. I don't know if qemu access directly the hardware, skipping the OS or something like that, but I wasn't able to do this feat. ...
4
votes
0answers
370 views

Setting Framebuffer splash resolution when exiting X

I installed a copy of BackTrack 5 R2 (Ubuntu 10.04) to my HDD and dual-booted with Windows 7. After a bit of tweaking I set about updating the native Intel drivers because it was only allowing me to ...
4
votes
0answers
750 views

Automounting not working correctly for CIFS shares; weird results

I followed the guide on this page to get samba shares working via autofs: http://www.howtoforge.com/accessing_windows_or_samba_shares_using_autofs Servers and Configuration My Samba server (remote) ...
4
votes
0answers
208 views

fsarchiver error

I'm running the following fsarchiver command: $ fsarchiver restfs /tmp/backup/c0d0p2.fsa id=0,dest=/dev/cciss/c0d0p2 I get the following error: [errno=22, Invalid argument]: ...
3
votes
0answers
40 views

Typing punctuation adds an accent to the preceding letter after my laptop is docked for a few minutes

I am running Manjaro XFCE. Everything worked like a charm for months now, but 2 weeks ago the keyboard configuration from my external keyboard seems damaged. Writing on my laptop itself works ...
3
votes
0answers
30 views

Stop init.d from running, and go to terminal prompt

I'm running Rasbian (Debian?) on my Raspberry Pi, and have allot of auto-starting things in init.d. But what if I want to stop them all from running, and simply break into a terminal prompt? I've ...
3
votes
0answers
43 views

Why is my swap not being activated automatically via fstab?

I've got a Linux embedded system that I'm experimenting with (the Elektor Embedded Linux Made Easy board, based on the GNUBLIN http://en.gnublin.org/index.php/GNUBLIN-Elektor). I'm using the 3.3 ...
3
votes
0answers
31 views

Is Watchdog can be disabled if once it is enabled?

I created a watchdog daemon application with time interval of 30 seconds; for every 5 seconds, I am trying to hit the watchdog counter, and it's working fine. If I kill this daemon process it shows ...
3
votes
0answers
38 views
+50

Reduce bad block retry / wait times in Ubuntu

How can I reduce the IO wait time and retry times so that the OS doesn't continually try to write to a failing drive? I have an system that I use to make copies of demo content that gets loaned out ...
3
votes
0answers
31 views

Output shutdown messages to multiple consoles

I have configured my system to direct console output on boot to serial and vga using kernel parameters. Serial is the last argument in the kernel parameters and will be the default used for ...
3
votes
0answers
29 views

Where is the input method configuration file?

My ibus input method was broken after an update. So I switched to fcitx. Actually, there are a handful IMs installed in my Fedora19 system, e.g. fcitx, ibus, yong, etc. However, I don't know how to ...
3
votes
0answers
35 views

What's the exact behaviour of the command: ip address change?

I have been fiddling with IPv6 and address lifetimes. I found out that the valid_lft attribute will make a v6-address disappear automagically, if used correctly. To extend an address' lifetime I would ...
3
votes
0answers
53 views

What are the differences between rdesktop and xfreerdp?

rdesktop and xfreerdp are both linux clients for RDP. However from their respective websites it is not clear what advantages/drawbacks of using one over other are there. I found one post, which ...
3
votes
0answers
95 views

Linux - Only first virtual interface can ping external gateway

I created 3 virtual interfaces with different MAC addresses all linked to the same physical interface. I see that they can successfully arp for the gateway (gw) and they can ping (the request is ...
3
votes
0answers
45 views

Host system keyboard layout changes when starting LXC container

I successfully created an archlinux container on an archlinux host with lxc. However, whenever I start a container via lxc-start -n GUESTNAME the keyboard layout changes to the default ...
3
votes
0answers
90 views

Read out pulseaudio volume from commandline? (I want: “pactl GET-sink-volume”)

I want to read out the volume level I can set with pactl set-sink-volume $SINK $VOLUME Is there an easy way to do that? As easy as the hypothetical pactl get-sink-volume $SINK ? (What I'm ...
3
votes
0answers
91 views

How to prevent the Linux kernel from waking a secondary HDD from sleep

Is there a way to instruct the (Linux) kernel not to wake up a secondary hdd after a system sleep/wake-up cycle? I'm asking because in my laptop I have an SSD as a primary drive containing the system ...
3
votes
0answers
45 views

Merge partitions

Due to some unfortunate partitioning I ended up with the following layout: /dev/sda1 (0-120MB) 128MB (boot) /dev/sda2 (128MB-500GB) 500GB (empty) /dev/sda3 (500GB-1TB) 500GB (zfs) ...
3
votes
0answers
176 views

linux udev rule to load gadget module for client driver

I'm having a hard time automating loading a gadget module and bringing up the usb0 device as a eth interface. The interface in question is g_ether for a embedded Linux device and connecting to a PC. ...
3
votes
0answers
39 views

Are there any canned solutions for running sshd in the initrd?

This is mostly aimed at Debian/Ubuntu, but I feel savvy enough on a variety of distros to be able to adapt the solution for one distro to another. Here's my scenario. There are a few situations when ...
3
votes
0answers
30 views

Can I limit total cputime used by a cgroup?

Although cgroups seemingly allow to control the CFS bandwidth of a cgroup, I don't see a way of enforcing a cpu time limit on a cgroup. The use case is that I would like to catch student programs that ...
3
votes
0answers
2k views

Installing Elementary Isis beta

How can I install Elementary OS Isis Beta? I tried to made a bootable stick using the latest iso builds but for some reason I cannot login. Having elementary OS installed on my machine, how can I ...
3
votes
0answers
77 views

Linux distros wont boot

I haven't been able to find an answer to this problem anywhere so im posting it here. So I'm trying to put a couple Linux distros on a laptop, using xboot and a USB drive, and when the computer ...
3
votes
0answers
185 views

Difference between txqueuelen and ethtool tx

What's the difference between the txqueuelen setting that can be applied with either: ifconfig eth4 txqueuelen 5000 ip link set eth4 txqueuelen 5000 And the tx ring size setting that can be applied ...
3
votes
0answers
113 views

linux io stack analysis

I'm trying to understand the Linux IO stack by analyzing blktrace trace. Below is the trace i captured by executing simple fio sequential write with no Direct IO (5 x 8k request size). 8,16 1 ...
3
votes
0answers
143 views

LXC with both GUI apps and snapshots on unmodified Fedora kernel

I am looking for a tool or library to run LXC that supports: running X applications conveniently snapshotting root filesystems (using a Fedora system with an unmodified kernel), so that I don't have ...
3
votes
0answers
176 views

Corosync/Pacemaker cluster loss of synchronization

I'm facing a problem with the corosync and pacemaker cluster software. I've two virtual nodes (Scientific Linux 6.4) and corosync/pacemaker installed on them: corosync-1.4.1-17.el6.x86_64 ...
3
votes
0answers
104 views

What is the difference between the output of TOP command and Oprofile?

In the top command one of the processes is always showing a CPU usage of 4 to 5%. But in oprofile the CPU usage is 0.004%. I do not understand this. And I also noticed that even when a process is in ...
3
votes
0answers
178 views

What happens if I delete dmraid?

I am new to Linux and am trying to install Ubuntu 12.04.3 LTS from a live-USB and have it run alongside my Windows 7 installation. On the installation screen for Ubuntu, at the partition page, I get ...
3
votes
0answers
29 views

Queuing disciplines are per-interface, what happen with interfaces using same device?

I have read about queuing disciplines here http://lartc.org/. I understand that for instance band 0 of pfifo policy is prioritized over band 2 within same qdisc, but what happen when i have ppp0 and ...
3
votes
0answers
584 views

Excessively high memory usage reported (3 GB) after reboot

Brief problem description: A 64-bit Gentoo on Intel Core-2 Q6600 reports about 3GB used out of 8GB total memory after reboot. This memory is neither claimed by any process, nor is it used by ...
3
votes
0answers
197 views

Scrolling with a WACOM tablet pen

I've got a wacom pen with a button. How can I trigger scrolling when moving the pen with the button pressed? According to xev, below, the triggering events are MotionNotify with state 0x200. If this ...
3
votes
0answers
480 views

Tune write disk cache flushing algorithm

I would like to use the free memory for write cache. Linux does that automatically, but it has some weird flushing algorithm that I would like tuned for my use. I have recently used ddrescue to copy ...
3
votes
0answers
382 views

How to migrate existing linux system to LVM partitioning

I want to migrate my system to LVM. My current setup is the following: Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = ...
3
votes
0answers
103 views

What does hierarchy support do in cgroup?

cgroup has 2 options for memory control: memory.use_hierarchy = 1 : use hierarchy memory.use_hierarchy = 0 : use flat hierarchy, according to this answer What is the difference between the two? I ...
3
votes
0answers
171 views

How to set CONFIG_PREEMPT_NONE in RHEL 6.4 (linux)

I am trying to tune the RHEL6.4 Kernel to handle server style load for of my application. With RHEL 6 scheduler has been changed to CFS and with RHEL 5 my application works fine. I would like change ...
3
votes
0answers
61 views

Is there a tool for seeing audit events as they happen without writing them to the disk?

Linux has an audit system that is usually used together with auditd, a daemon that, as far as I know, is designed for logging all events to the disk. However, I would like a way to directly get the ...
3
votes
0answers
152 views

Exynos 5 DVFS or turning off cores in Ubuntu - Scaling frequency for one of the cores only (dual core) (cpufreq)

I was wondering if there is possible to scale only one of the cpu cores in the A15 in Exynos 5 ? I have tried using e.g cpufreq-set -c 1 -f 500MHz, but both cores are set to the same frequency. When ...
3
votes
0answers
252 views

Using symbolic links and git to manage build versions

In general I follow the following workflow when I build any program (e.g. emacs, tmux, etc.) /home/opt/[name of the program]/builds/[version]/ bin lib share For example for a program like tmux I ...
3
votes
0answers
166 views

How to route one video device to multiple programs

I'd like to direct the output of a single capture card (Hauppauge PVR-150) to two programs: VLC (for streaming on LAN) and MythTV for scheduled recording. I think it's possible to do this with the ...
3
votes
0answers
93 views

Restricting D-Bus access to the logged-in user via ConsoleKit or systemd

I need to restrict the client of a D-Bus service to only the user logged into the system locally, via ConsoleKit or systemd. How must I configure or write the D-Bus service to do so?
3
votes
0answers
382 views

How do I let an SDL app (not running as root) use the console

I want to use an SDL-based program to display graphics on the console, without having to log on from the console, and without running the program as root. For example, I want to be able to run it via ...
3
votes
0answers
286 views

Screen flickers in Fedora 17

Screen flickers every 10 seconds. (I timed with a stopwatch, screen flickers every 10 seconds, 6 times a minute exactly.) I've used Windows and I'm trying to use Linux. I don't know much about Linux. ...