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.

learn more… | top users | synonyms (1)

0
votes
1answer
2k views

How can I add the current CPU usage to my menu bar as a percentage?

I'm used to OS X and I use MenuMeters in my menu bar to monitor CPU usage as a percentage and memory as used/free totals. I really want to add this functionality in Ubuntu as I'm using it for ...
0
votes
1answer
75 views

safe to use Cpufreq

I have a hp pavilion dv5220us with a dual core T2050 (1.6Ghz , 2M L2 Cache , 533mhz Fsb.). I was womdering if it is safe to use CPU freq. the applet for Ubuntu 12.04.
2
votes
0answers
37 views

ubuntu black screen appears

I am using ubuntu 12.4 in that we have installed 2Gb RAM dual core processor I have installed some of the software like eclipse , SQL . while using these software's few seconds screen goes into black ...
0
votes
0answers
118 views

Numerical performance of Intel's 4th generation vs 3rd generation cpu's on ThinkPad

Maybe a stupid question, but any feedback would be appreciated! I just purchased a new pc in order to run the latest Haswell cpu on some numerical benchmarks. To my surprise, I found that the exact ...
1
vote
1answer
246 views

Can't scale frequencies, always jumps to lowest

The title pretty much explains it. I know this is not a hardware issue. CPU is an Intel Core Duo Output of cpufreq-info: cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors ...
0
votes
0answers
102 views

High(er) idle cpu temps compared to Windows

My CPU seems to be getting a lot hotter under Ubuntu compared to Windows. I am not basing this on actual temperature readings, but simply on the fan that's kicking in, which it doesn't do under ...
0
votes
0answers
28 views

My computer runs Windows 7 64-bit, but won't install the 64-bit version of Ubuntu [duplicate]

I have a laptop that runs Windows 7 64-bit. I'm trying to install Ubuntu to be a secondary operation system, but when I run the setup I get a screen that says This kernel requires an x86-64 CPU, but ...
1
vote
1answer
368 views

How do I use all available hardware resource in my Intel® Core™ i7-3517U?

My sony vaio has a processor model: Intel® Core™ i7-3517U It appears to me as being 4 cores but it does not show the threads. What is wrong? How could I fix it? How can I access that information? I ...
0
votes
0answers
153 views

CPU usage increased to 90-100% after installing Nvidia X server

I have latest version of lubuntu and i5 2500K cpu. Yesterday I installed nvidia drivers using this guide at www.dedoimedo.com, first method. Before I installed drivers I did sudo apt-get update sudo ...
1
vote
1answer
296 views

How many physical processors does ubuntu support? [duplicate]

How many physical processors does ubuntu support? I have a 4 socket server mainboard with 4 dual core AMD Opterons. Will Ubuntu support all 8 processors. I also have plans to upgrade to 6 core ...
0
votes
1answer
366 views

Set A Lower P-State For My CPU (Underclocking)

In Windows 8 you can set a max/min cpu speed percentage allowing you to use your cpu at a lower or higher P-State. For example, my cpu has a default speed of 2.3ghz (turbo 3.2ghz), however using the ...
1
vote
0answers
78 views

Why my CPU of 2.1GHz clocks at 800mhz in Ubuntu 13.10?

I've a problem with my notebook DELL INSPIRON 1720. This notebook have a CPU Intel t8100 2.1GHz and it doesn't work perfectly. It works at 800MHz stable, like in power-safe. But when I change the ...
2
votes
2answers
504 views

Stop cpu from overheating

When running intensive apps like blender my CPU can get up to 80.C I can manually underclock the CPU from the BIOS but I would like to have my pc detect when the CPU temp gets too high and slow things ...
0
votes
0answers
14 views

What is kworker and why is it using almost 100% of the first cou core? [duplicate]

I know this question is asked several times, but I don't find a solution (if there is any) I have a samsung series 7 CHRONOS laptop. CPU - Intel® Core™ i7-3635QM CPU @ 2.40GHz × 8 I'm on Ubuntu ...
2
votes
1answer
372 views

cpu load not distributed over cores

Under heavy task it seems the cpu load is not spread accross all available cores and fan is triggered wile I am waiting for the opération to perform... Looking at the CPU monitor one CPU is 100% when ...
1
vote
0answers
139 views

How to find CPU shutdown temperature? (Think it's called TJMax, maybe not though…)

In Windows there is a program called CPU Temp which shows various CPU temperatures, one which being the temperature at which point the computer will shut down to prevent damage to the CPU. I have a ...
0
votes
2answers
210 views

How do I Manually Limit CPU Usage? [duplicate]

I have an old laptop prone to overheating and a good solution I found was limiting it's CPU usage to below 50%. On Windows, I can do this by changing the power plan I am currently using, and altering ...
1
vote
1answer
59 views

cpu power mode occasionally changing to performance

The CPU power mode is occasionally changing to performance which causes my laptop to overheat and shutdown :( Is there any way to prevent that?
1
vote
2answers
5k views

“Kernel requires x86-64 CPU, but only detects i686” in an Intel Intel Core i7-2600k?

I have a VM installed in my windows 7 PC, and I want to install an Ubuntu 13.04 on it, as a new virtual disk. I have this machine: Intel Core i7-2600k CPU @ 3.40Ghz - 8 GB RAM - 64 bit operating ...
2
votes
1answer
349 views

CPU frequency scaling on Ubuntu and Windows

Linux reports my CPU's maximum frequency as 2.40 GHz and min as 1.2 GHz. Windows 8's Task Manager shows the CPU frequency going above 3.0 GHz or below 1.0 GHz on occasion, according to usage. This is ...
0
votes
1answer
310 views

Incorrect CPU clock speed?

I have recently purchased a new laptop, and installed Ubuntu. It uses an AMD A8-4500M processor, which, according to the link below, should have a clock speed of 1900-2800 mhz. ...
0
votes
1answer
4k views

How to configure cgminer to mine with the CPU?

I installed the cgminer to try to get into a bitcoin mining pool, but I have no GPU. I know that mining with the CPU is not very eficient, but I want to know how to configure cgminer to mine with the ...
0
votes
1answer
117 views

Can't Boot An Intel Equipped Laptop From the Burned ISO For 13.10 ISP (X386)

Keep getting an error message that "This kernel requires the following features not present on this CPU: pae". I'm running an Intel Pentium M 2.0 GHz, with 2 GB of RAM on a 60 GB hard drive. This is ...
1
vote
0answers
336 views

Corsair Hydro i series cpu cooler fan control

I have been toying with the idea of a Corsair h80i for my dual boot system (win7/U12.10) and mostly use it in ubuntu. I have done some research on the interweb regarding fan control in linux and ...
-1
votes
1answer
33 views

Which ubuntu 12.04.3 is best for Device lc2430i ? [duplicate]

Which Ubuntu version should I download for new Linux-certified laptop ? Device Name: lc2430i MEMORY: 3.8GiB Processor:3rd Generation Intel Core i5-3210M CPU @ 2.5GHZ X 4 (3MB L3Cache,2C+HT) OS TYPE: ...
0
votes
1answer
228 views

Ubuntu 12.04 doesn't recgonize m CPU correctly

My computer is running ubuntu 12.04 (64bit), and I have a AMD Athlon(tm) X4 760K Quad Core Processor which is about 3.8ghz (and an Radeon HD 7770 GPU). Yet, when I type in cat /proc/cpuinfo - I get: ...
1
vote
1answer
3k views

Display clock frequency per core using Conky [duplicate]

I am using Conky to display a lot of information of my system. I managed to display the load percentage per core. But I do not know how to display the clock frequency of each core. What I have now is: ...
1
vote
0answers
193 views

TOSHIBA Satellite U400 kernel 3.10 3.11 3.12 cpu fan

After switching to any kernel above 3.9.11 my cpu cooler acts like cpu was overheating, it spins all the time trying to cool down processor even if it's below 50 Celcius. I don't think it's the distro ...
0
votes
1answer
37 views

Weird System performance

I just freshly installed Ubuntu 13.04. My CPU seems to be going from 70 to 30 every 5 seconds or so. Same for the wireless. Weird stuff going on
3
votes
2answers
518 views

What temperature is considered bad for my processor? [closed]

I am using the unity Temperature sensor and I have an Intel® Core™2 CPU 4400. If you need more info I would be happy to include more details about my PC that could help. Thanks
1
vote
1answer
156 views

High CPU Usage Causes Server Power Off

My first post here, so apologies if anything is missing. I currently have an Ubuntu hosted VPS, which periodically runs a PHP script which does a lot of regex processing and interaction with a local ...
2
votes
2answers
2k views

What is vPro, is it Linux compatible?

I saw that some of the Lenovo laptops have "vPro" processors, which enable special management features: ...
0
votes
1answer
129 views

How to restore the cpu frequency defaults or to align the frequency at will?

I really new at ubuntu and linux so i am not capable of understand the following: usage: update-rc.d [-n] [-f] <basename> remove update-rc.d [-n] <basename> defaults [NN | ...
1
vote
3answers
2k views

Sony Vaio VPC-EC Series, CPU Temperature very high.

I know this has been asked quite a few times before, but after some intense research I still could not fix my CPU problems. I'm running Ubuntu on a Sony Vaio from the VPC-EC series. Under windows 7 ...
-1
votes
1answer
149 views

Wich version of ubuntu should i use with my processor [duplicate]

I bought a laptop a while ago and i'm sort of trough with windows. I wanted to try ubuntu but I don't know wich version I should take. I got a Samsung NP300E5A-S02NL It has a Intel I3 ...
1
vote
2answers
249 views

Why does CPU usage spike just when Transmission is finishing a download?

I noticed this when I was watching a video and it started lagging just before until shortly after a download finished. The second time I monitored it using top and the cpu rises above 100%. My ...
3
votes
2answers
66 views

Is there any way to retain word 2010 format?

I have some resumes and other documents that are really format dependent. They were originally created with Microsoft Word 2010, and is there any way to put them into ubuntu and have them still be ...
0
votes
1answer
213 views

How to resolve excessive CPU usage?

I just installed Ubuntu 13.04 on my brand new notebook and PU usage is insane. I'm a new Linux user. Can somebody help me? Specs and system monitor:
4
votes
1answer
130 views

Which file is called or event is fired when we plug-in / plug-out power supply to the laptop?

Everytime I plug-in or plug-out powersupply the CPU frequency is changed to 'powersave' which results in reduced efficiency. I need to be on 'performance' all the time. I've made a small java utility ...
2
votes
1answer
149 views

How to log and export CPU Usage over time?

I am currently doing a project at school about sound proofing a PC Case and need a way to log the CPU load, so that I can graph it against sound and temperature of the case. I am very new to using ...
1
vote
2answers
7k views

High CPU usage even when no application is running(Desktop)

I always have high CPU usage in Ubuntu in every version of it that I have used. I have been using Ubuntu from 10.04 version. My CPU usage even at idle is more than 30% for each core(unlike Windows 7 ...
7
votes
1answer
3k views

How to use cgroup in ubuntu 13.04

I'm trying to learn how cgroup works on Ubuntu and seems that cgroup doesn't work in Ubuntu 13.04. I am using the answer to this question How to set cpu limit for given process permanently. Cpulimit ...
-1
votes
1answer
27 views

13.04 Installs the wrong ISO [duplicate]

When I download the 64 bit 13.04, no other options are given and the download just begins. I am using a MAC and this default is the wrong processor.
2
votes
0answers
348 views

In Ubuntu 12.04, odd whining/humming coming from left side of MBP (2,2)

I have been searching for a similar issue to mine, but unfortunately haven't found anything. Anyhow, this week I installed 12.04 on my 2006 MBP (2,2). Pretty much everything seems to work OK, but ...
0
votes
1answer
4k views

is it true that Chromium uses more cpu than firefox?

Hi I was a firefox user but I switched to Chromium a while ago and I feel like Chrome uses uses more cpu browsing the web than firefox... I have this psensor app installed on my ubuntu 12.10 which I ...
0
votes
2answers
1k views

Processor temperature when just browsing the web is 55-60 C

I'm running ubuntu 12.04 on my laptop. It has an Intel® Core™ i7-3537U CPU @ 2.00GHz × 4, 8 GB ram, and an AMD Radeon HD 8730M It also has a Intel HD 4000 but i'm using AMD I have nothing else open ...
3
votes
1answer
1k views

mount.ntfs taking up 99% of cpu [closed]

I dual-boot Ubuntu and Windows with WUBI, version 12.04, and have been recently running into some issues. Every once in a while, I run top and see that mount.ntfs is taking up all of my cpu. It is ...
2
votes
2answers
2k views

Permanently change maximum CPU frequency

So far I've found temporary solution for my problem at Maximum CPU frequency stuck at low value, but the question that I have is how to make it permanent. Right after reboot, frequencies are set back ...
3
votes
3answers
1k views

Hyperthreading on 32-bit but not on 64-bit?

I have a strange situation. I have two computers with identical hardware, both Core i5, exactly the same model. The only difference is the OS, one has 12.04 32-bit and the other one has 12.04 64-bit. ...
2
votes
1answer
2k views

Xorg/Compiz is using massive amounts of CPU. What to do?

I am using Ubuntu 12.04. I've been trying to figure out what is causing my Xorg and Compiz to frequently come close to maxing out my CPU usage for weeks now. Essentially, during normal use, both ...