CPU stands for Central Processing Unit, and is the main processing chip used in every computer. Brands include Intel, AMD and ARM. CPUs are commonly available in 32- and 64-bit, and come in a variety of frequencies or with multiple cores.

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Proprietary Intel driver for processor microcode firmware seems to disable overclocking

I installed Ubuntu 14.04 on Asus B85M-G motherboard with G3258 CPU. This CPU has good overclocking possibilities and I was able to overclock it without hassle. Due to minor issues with hibernation and ...
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ffmpeg and libx264: Extremely high CPU temperature

Ahoy there! I turned my previous gaming rig into an Ubuntu Server 14.04 a year ago, and have been using it as a private nginx-rtmp live streaming server. Today I started to dabble with ffmpeg for ...
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16 views

CPU usage becomes extremely high after opening laptop lid after upgrading to kernel 3.19

So I recently upgraded my kernel to 3.19, and now, whenever I close my laptop's lid and re-open it, the CPU usage will spike to ~75% on all four cores of my CPU. However, Activity Monitor doesn't list ...
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CPU usage spikes to 75% and stay there after resuming from sleep mode?

So I recently upgraded my kernel to 3.19 (as part of a failed GNOME install that I have since undone), and now, whenever I close my laptop's lid and reopen it, CPU usage will spike after to minute or ...
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1answer
77 views

Ubuntu not recognizing all CPU cores

I'm not new to Linux but I'm not an expert either, so bear with me if this is a stupid question. We're running Ubuntu 14.04.2 from a live session USB to test out a new dual CPU workstation. It has ...
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3answers
119 views

15.04 Only Boots in Recovery Mode After CPU Change

I moved from an FX-6300 to an i5-4690k so I could have an ITX-size computer, and transplanted both the hard drive and the GPU. Gnome wasn't very happy about this, so now when I try to boot normally, ...
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2answers
39 views

Check CPU and other hardware components in Lubuntu [duplicate]

Tell me please which are the best ways to check the temperature of the CPU and other hardware components in Lubuntu? It would be better if the applications could even tell me which are the normal ...
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1answer
65 views

How can I set the CPU frequency to always stay at its maximum?

Since I mostly use my laptop as a desktop, I'm trying to set its CPU to its maximum frequency. The CPU is an Intel Core i5-3337U (dual-core with Hyper-Threading), which caps at 2.5GHz (with 2 active ...
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45 views

Why is my Ubuntu running so slow?

AMD E2-1800 APU with Radeon(tm) HD Graphics × 2 4GB Memory (3.5 Usable) Gallium 0.4 on AMD PALM 64 Bit I know I have a slow processor but that shouldn't make my system run as slow as it is, even If I ...
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1answer
22 views

CPU benchmarking utility for Linux

I am looking for a utility that will benchmark CPU performance under single and multi threaded instances. At present I have an old rig with a dual core CPU (E7500) at 3.6 Ghz and I am looking at ...
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22 views

PCManFM and Nautilus 100% CPU usage

PCManFM and Nautilus take 100% of CPU (each one about 50%) I am on Ubuntu 14.04.2 LTS with lubuntu-desktop. Note that at start, Nautilus doesn't take anything, but takes 50% all the time once a window ...
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182 views

High System Load, Low CPU/RAM Utilization on Ubuntu 15.04

not really a system administrator here but really trying to just set up a server (a rented VDS, really) for some friends. I recently transferred basically game servers/MySQL/web sites over from one ...
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65 views

14.04, I have Disabled CPU throttling, but installing Atlas says: “CPU Throttling apparently enabled”

My PC is using ubuntu 14.04, and I need install Atlas. Atlas says: it need to disable CPU throttling, I have done the job to disable it. cat ...
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1answer
22 views

Dell D630 T7100 only 3 CPU Freq Steps

In my Dell D630 with a T7100 CPU i only get 3 FREQ-Steps : 800 Mhz, 1,2 GHz, 1,8 GHz but i want more as my other device with a T8300. How can i change it ? I want to have 400 MHz , 600 MHz, 800 MHz, ...
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1answer
28 views

Whats the meaning of CPU% for each process in top command?

I was running some heavy processes inside a VM and then I used top command to see how much loaded the system is. Overall CPU showed 29% while CPU% for qemu showed 133%. %CPU definition from top man ...
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41 views

CPU number differs in 'About this computer' and /cpu/cpuinfo

Question: I'd like to ask what may cause that there are two different informations about the number of processors. See the reports below. System dialog: If open the System settings/Details tab ...
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25 views

Problem with CPUPower

I have set my CPU frequency to min and max, but when my laptop is plugged to the adapter it changes it automatically the min and max frequency to the maximum CPU frequency (2.2Ghz). When it is ...
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0answers
48 views

How to disable cpu frequency scaling on MacBook Air

I am having problems disabling CPU frequency scaling on a MacBook Air 6,1 (dual core 1.4 GHz i5-4260U with hyperthreading) laptop with ubuntu 14.04. I need to disable the frequency scaling to install ...
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118 views

Why aren't all of my CPU cores always detected in ubuntu 14.04 with an Intel Core Duo 2 CPU?

I'm using Ubuntu 14.04.2 LTS with kernel 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux. Computer model: iMac Late 2009 ( ...
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0answers
53 views

Ubuntu crashes frequently

I recently moved from Windows to Ubuntu 14.04LTS 64-bit OS. Initially everything worked really well. However for the last couple of weeks Ubuntu started behaving crazy. The transition from good to ...
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343 views

High CPU by Firefox

For some days, Firefox has been consuming high CPU percentage while simply loading pages. It drops down otherwise. It often crosses 100% and even goes beyond upto 150% sometimes(!). I ran Firefox in ...
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19 views

Ubuntu equivalent of windows 8 processor power management and system cooling policy?

what is the equivalent in Ubuntu of processor power management and system cooling policy that you would find in windows 8 ? thanks
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1answer
18 views

Pin virtualbox to core(s) on precise pangolin (12.04)

I'm trying to pin VirtualBox to a few cores with taskset like so: /usr/bin/taskset -c 1-3 VirtualBox &; disown But the taskset has no effect. I have verified that taskset works with processes ...
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53 views

My cpu slows down after a while and does not recover

Sometimes, and I can't reproduce it (but it happens often enough - a few times a week at least) my cpu slows down below its prescribed minimum. This is an example cpufreq-info output from a minute ...
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1answer
20 views

Will replacing Windows 8.1 with Ubuntu limit processor fearures?

I've bought a Lenovo Thinkpad Edge E540 and am intending to replace the pre-installed Windows 8.1 with Ubuntu. Will I be able to make use of processor technologies, such as Hyperthreading, VT-x etc., ...
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47 views

Machine Check error using Nvidia drivers on 15.04

Hwæt, Hardware specs: CPU: AMD FX 8350 8-core GPU: Nvidia GeForce GT 630 Motherboard: ASUS M5A78L-M/USB3 A few weeks ago, under Trusty Tahr, I started having graphics problems. Several bad ...
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123 views

Firefox eventually for no aparent reason consumes all CPU and RAM and grinds to a halt pulling my computer along with it

I now use Firefox as my default browser and have found that after having it up and running for several hours, that it starts to use up more and more of my CPU and RAM, and this does not appear to have ...
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168 views

Dell XPS 13 2015 CPU performance on battery

I recently purchased a Dell XPS 13 with Ubuntu (i5 5200U CPU @2.7GHz) and I detected that system works slow on battery mode. cpufreq-info says: ... analyzing CPU 0: driver: acpi-cpufreq CPUs ...
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2answers
34 views

indicator-cpufreq disappearing from top bar

When I run indicator-cpufreq it shows the icon but when I leave the terminal it removes it. How can I make it permanent ?
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2answers
56 views

How to make cpupower not reset after each restart?

I use this command sudo cpupower frequency-set -u 1.5G To make the max CPU frequency to 1.5GHz but after restart it sets it back to default. How can I set this at boot ?
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3answers
156 views

Disabling Intel Turbo Boost in ubuntu

I'm new to Ubuntu and want to disable the turbo boost. I tried with cpufreq but i cant get it to work. is there any other way to do it. In windows it was as easy as changing the CPU speed from 100 ...
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38 views

14.04 - How to use integrated CPU graphics with NVIDIA driver?

I'm running Ubuntu 14.04, and am having some graphics troubles. Basically, what I want to do is have the NVIDIA driver installed, while still use CPU graphics for the display, and have my NVIDIA ...
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1answer
65 views

CPU frequency limit to 2000 on battery

I want set frequency to 2100 in battery mode but it have limit to 2000. I ran tlp ac and change CPU frequency with indicator-cpufreq to 2100 (and also check Performance) then check frequency with ...
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41 views

Is there an Ubuntu alternative for CPU core parking manager

Is there a Ubuntu alternative for CPU core parking manager (for windows) http://coderbag.com/Programming-C/CPU-core-parking-manager ? For my OpenGL app some CPUs will try to throttle and then start ...
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1answer
381 views

Why Ubuntu 15.04 with kernel 3.19.0-15 is using significantly more power?

I've recently upgraded to 15.04 and immediately noticed significantly faster battery depletion and warmer case. My MacBook Air 6,2 would easily hold 10-12 hours on battery power with Ubuntu 14.10 and ...
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1answer
28 views

temperatures files location

i want to know how to see temperature files in my Ubuntu system. I want to see the temperatures of cpu, graphics card, cheapset, etc. I know that they are somewhere on sys/class/(some people say at ...
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1answer
30 views

Process can not get more than 30% CPU

I'm running a program that is known to be CPU time consuming, but it can not get more than 30% for me which causes issues and crashes. Does anyone have an idea on maybe some parameters limiting the ...
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14 views

'Bus cycles' unavailable

Sometimes when I am booting I stuck on this... And nothing happens. I have windows in dual boot and it doesn't boot either. Now I booted when I pressed and hold power button but not as long as I want ...
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1answer
185 views

System Monitor showing incorrect number of CPUs

I'm currently running Ubuntu 14.04.2 Desktop. The System Monitor tool is showing me 32 CPUs when I'm expecting 56. Should I be concerned? Screenshot of System Monitor: As you can see, it shows 32 ...
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1answer
4k views

A weird driver appeared after upgrade to 15.04

In English this sounds something like this: Unknown: Unknown This device is not working Using Processor microcode firmware for Intel CPUs from intel-microcode (proprietary) ...
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2answers
96 views

why does /proc/cpuinfo show a single processor on the BQ Aquaris phone?

phablet@ubuntu-phablet:~$ cat /proc/cpuinfo Processor : ARMv7 Processor rev 3 (v7l) processor : 0 BogoMIPS : 2072.57 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls ...
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0answers
43 views

Is a Beowulf cluster a solution for me?

Background I'm an undergrad working on an scientific experiment. Till now I was pilot testing our one of the program on Ubuntu 12.04 and now I need to deploy it. The PC on which I tested the program ...
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20 views

CPU problem open PDF

I've a Lenovo X1 Carbon and I've big problem opening PDF. Doing top command I get 100% cpu on xorg task. Any help?
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43 views

Incredible compiz CPU usage!

right now I'm fighting against Compiz process CPU usage :'( As you can see, it's how many CPU is compiz consuming; it's a lot and it's overheating a bit the server. Also, stands out that the ...
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1answer
34 views

Is I-nex temp reading accurate

I got I-nex and I was wondering if the cpu temperature is accurate. I have a fx-4150 and wanted to do a slight overclock. My computer is pretty much idle with only I-nex open. It says my cpu temp is ...
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46 views

High CPU usage in Ubuntu server

I have a server running Ubuntu 12.04. At certain times of the day, the CPU rises to consume its 100%: How can I fix this?
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57 views

How can I get the number of hardware level threads in my computer?

How can I get the number of hardware level threads in my computer using the ubuntu terminal?
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55 views

what is the difference between x86_64 amd64 and 64 bit

what is the difference between x86_64 amd64 and 64 bit ? I think its a stupid question but still. I use a x86_64 bit Ubuntu, but when ever I try to do a live boot of any other 64 bit images like the ...
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1answer
91 views

Ubuntu isn't using 4-cores

My notebook processor has 4 physical cores. but ubuntu is showing only 2 of them. what can i do to make ubuntu use all the cores? $ sudo lshw -C cpu *-cpu description: CPU ...
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70 views

CPU working at 100% clock spead on Ubuntu 14.04 LTS

I recently installed Ubuntu 14.04 LTS on my x64 laptop and now my CPU is working at 100% and overheating due to that. There is no software installed on the machine. I reinstalled the OS but my problem ...