Ubuntu :: Can't Get Newest Real Time Kernel To Show Up In Grub 2 (Karmic)?
Apr 26, 2010
I want to try out the realtime kernel to get my audio latency down. I have installed the realtime kernel packages according to the Ubuntu Studio preparation documentation here - I have also run sudo update-grubHowever, when I boot up, the realtime kernel option does not show up in grub2. The current kernel I am using is 2.6.31-17, but the only options in grub for it are -386 and -generic.
There is a previous entry of 2.6.31-9-rt which I had attempted to use previously (sometime last year) but if I select it, it doesn't even boot at all.I checked my /boot directory and there is no vmlinuz-2.6.31-17-rt file .... Which I am assuming is why it doesn't show up or add when I run update-grub ... But I am currently at a loss for how to actually get the 2.6.31-17 realtime kernel file and add it to grub2.
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Mar 14, 2010
I'm a very new Linux user, so speak slowly and don't use big words. I installed Karmic from the Live CD. It is the only OS in use on this system. I then upgraded to Ubuntu Studio using the instructions found on the wiki.
On bootup, I get a brief message stating "GRUB loading" and then the system automatically boots to the generic kernel. No GRUB menu is ever displayed. I would like the option to boot to the real-time kernel, but I have no idea how to edit the appropriate files. I've done a fair amount of reading on the subject, but I find very little information relating directly to the real-time kernel, and so I still feel like I'm too green to do it without messing something up.
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Mar 20, 2010
I have been running Ubuntu 9.10 ever since it was released, on my HTPC. However, for some reason when a new kernel comes out and I upgrade to it GRUB 2 doesn't load the newest kernel but just loads the old original kernel that came with it when I originally installed 9.10. I have confirmed that the newer kernels are installed by editing the GRUB 2 command line at startup (just a temporary fix) and all worked well with the newer kernels. How can I make GRUB 2 load the newest kernel by default. On my laptop running 9.10 it has loaded the newest kernel by default ever since I installed it but my HTPC just won't cooperate.
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Sep 9, 2010
if I want to use an rt kernel in ubuntu studio, how do i use the kernel? say for instance, Ubuntu studio is installed with generic kernel.then i download the rt kernel.
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Dec 29, 2010
Just installed a real time kernel on my new computer so I can record music. My problem is that I have no GUI. I noted that I would not when fglrx drivers could not be installed/applied to the new kernel when installing it.
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Jan 20, 2010
I was wondering if there's a way for me to get real-time kernel support on regular Ubuntu 9.10 through some sort of update. I know Ubuntu Studio has a real-time kernel, but I'd prefer not to use it. I'm a fan of the original Ubuntu.
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Sep 25, 2010
I have the latest release of Lucid Lynx installed. I want to try out audio recording on Linux so I want to know if it's possible to use a real time kernel with Lucid. So I installed the 2.6.31 real time kernel. It shows up in GRUB, but when I boot it gives me the message:
mounting none on /dev failed No such device
It then takes me to the login screen, and once I enter my password it just takes me back to the login.
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Sep 8, 2010
install Xenomai on real-time kernel (With PREEMPT_RT)?
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Jul 6, 2011
In regards to compiling a custom kernel:
When using make menuconfig - under Device Drivers --> Character Devices --> there should be an option with the label "Enhanced Real Time Clock Support" (CONFIG_JS_RTC).
The problem is that this option seems to only show up while using the menu method when other options are either enabled or disabled and I've entirely forgotten what should be what. I swear fingered it out once.
This is on an older computer (P4) so HPET is no good.
You would think that disabling the HPET option would enable the RTC option but that does not appear to be the case.
I understand I can just add the option to the .config file and avoid this hassle but I'm very interested to know how to make this work.
To show my appreciation I will do something nice for you such as call you a nice name or tell you that you are pretty (or ugly if that's what you prefer).
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Mar 23, 2010
what the recommended way to set up real-time (or near real-time) folder synchronization among 2+ servers. I looked a rsync but that doesn't sound real-time and it looks like its something that you might put in a cron once an hour.
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Mar 9, 2010
I'm currently running Karmic 9.10 in dual boot with Windows 2000. My computer has automatically updated and installed kernels 2.6.31-17, -19 and -20 (They show up in Synaptic as installed).
However, the newest kernel choice in my GRUB menu is 2.6.31-16-generic (followed by -15 and -14). These all start without any errors.
Question: Why haven't the newer updates shown up in GRUB for booting purposes?
Could it be a question that I didn't answer correctly some time back about accepting or not accepting an update or change in GRUB?
How can this be changed? The new kernels do not show up in Start-Up Manager either.
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Aug 4, 2009
I am hosting two Virtual Servers both running Centos 5.3 on a host machine also running the same OS. The VM software in use is Xen, as supplied with the OS.The host machine's time and date is fine, however both Virtual Servers are running ahead of real time consitantly.Running /etc/init.d/ntpd restart will resolve the issue however one of these is running MailScanner and when the time suddenly goes backwards, sometimes by as much as an hour, it stops working properly.
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Jan 28, 2010
I used the following command to get the unix time of root user creation:
Code:
awk -F":" '$1 == "root" {print $3}' /etc/shadow
How can i convert this into the date/time of creation?
I am writing a shell script, which determines the OS installation date among other stuff, and i am assuming the root user's account creation date should be a pretty accurate pointer. Are there reasons why i should not be assuming so?I would be open to other suggestion for getting this date/time, but it would nevertheless be interesting to convert the unix time to "real" time without doing complex manual(or otherwise) computation..
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Nov 18, 2010
I had done the upgrade from 10.04 to 10.10 online and couldn't boot to newest kernel and had to select the previous one in GRUB. From what I have read it may be because of NVIDIA drivers or some conflict. Anyways,I did a fresh install of 10.10 from the Live CD overriding my 10.04-to-10.10-online-updated partition so I do not have an option to boot older Linux kernels now. I was wondering if the Live CD could be used to install any previous linux kernels for the new installed Ubuntu 10.10 system.
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Mar 31, 2010
i am using lucid beta 1 and indicator applet shows my user name. i know it is also the case for karmic. is there any way to change it so that it shows my full name? because it looks much more formal if it shows my full name instead of my "nickname".
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Dec 11, 2010
Recently i downloaded the stable version of kernel from kernel.org then i extract the tarball to /usr/src path , then after i complile the kernel for fuse and ext4 modulescommand which i use is mention below
[root@localhost linux-2.6.36.1]# make menuconfig
[root@localhost linux-2.6.36.1]# make
[root@localhost linux-2.6.36.1]# make modules
[code]...
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Aug 8, 2010
I'm running Ubuntu 9.10 Karmic Koala, and the latest kernel upgrade (xxxx.22) won't start the system because it can't find the hard disks. It ends up with a prompt from (initramfs).The computer has an MSI board with Intel P4 Dual CPU, and a Phoenix Award BIOS marked W7037 IMS V1.2, dated 091604 (Sep16/04). I doubt that a newer BIOS that will fix the problem, but if anyone knows I could try to find a floppy drive and a diskette, because they require that to install the newer BIOS (ver 1.3). Does any one have a better method? Is it still possible to get the previous kernel version until they fix this bug (if they ever will)?
Is there a way to change the boot sequence in GRUB2 so the original kernel would be the default even if the rest of the software has been updated? Since 10.04 has several bugs and annoyances, may be it's time to change to another distribution (I've tried Mint 9, but it has much of the same, like having to enter the password if I take a short break from the computer). Many questions at once, but less and less things are functioning with each new revision. For instance to use the scanner I must go back to 8.04, or use WINDOWS! (The scanner is the only reason why I have Windows on the computer).
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May 14, 2011
this is a new problem with issues that started when I upgraded to 10.10. Originally, GRUB wouldn't load after that upgrade, but that was fixed here. Once GRUB was working properly, there was a problem with the 2.6.35-28 generic kernel. When I tried to boot through it, I would only get an ubuntu command line.
Luckily the older 2.6.32-22 generic kernel worked just fine and I could log in and load my ubuntu desktop with no issues. I decided to upgrade to 11.04 to see if that would correct whatever was going on. The installation was completed without any apparent issues, GRUB works, XP Pro works, and the older 2.6.32-22 generic kernel allows me to boot into 11.04.
Unfortunately, another new kernel, 2.6.38-8 generic, is not working properly. I snaped some pictures of what happens when I try to use this kernel:
[URL]
The first is GRUB/ The selection The second is the loading graphic The third is a command line where it freezes (note: this is not the same command line screen/environment that I was referring to with the 10.10 new kernel)
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Dec 3, 2010
Recovery mode doesn't work, same problem. Taking the older kernel gives no problem. I have no 3rd party graphics driver installed. 10.04 was a fresh install on this machine. I cannot get a commandline, the screen just shuts down because of a lack of input.
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Oct 12, 2010
I'm new in UBUNTU and would like to get a real-time antivirus.Maybe it's not necessary, but I still want it (I've got an iMAC and have installed an antivirus... ) So, please... which antivirus is good and in real-time (I mean that, if I try to open an infected file or go to a bad website, it stops it). Is KLAMav good and in Real time?
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May 24, 2011
It takes me a while to log in the splash screen just sits there for ages before i get to the desktop. Never used to be this slow and I'm not sure why. Firstly, I'm running Ubuntu 11.04, standard DE. I do have conky starting up in a script but it has the & at the end of the line so I didn't think this would cause it (or is there some special case for log in time on how & is treated?). However as a test I will comment out the line in the script and see if it is the cause.
However just for general knowledge and in case that isn't the problem, how does one go seeing what is happening during the time from when one log's in and the desktop is displayed? Is there some kind of log that shows the date/time that can be enabled or is there a debug mode that can be enabled somehow via special keys or maybe from grub?
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Dec 20, 2010
Running qjackctl as root allows me to run the audio in realtime so it seems to be a permissions problem and it seems to me that lubuntu does not read the /etc/security/limits.d/audio.conf file when I boot.
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Jul 30, 2010
after upgrading to make 3.82, I can not compile the newest kernel: 2.6.35-rc6-git5，it failed with:
GEN /home/aaa/tools/kernel/output/35/Makefile
CHK include/linux/version.h
CHK include/generated/utsrelease.h
[code].....
Maybe 3.82 has some backward-incompatibility that breaks kernel compilation.
[URL]
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Feb 24, 2010
I created filesystem XFS on partition hda8 with subvolume real-time on partition hda5: Code: mkfs.xfs -r rtdev=/dev/hda5 /dev/hda8 and i mounted it: Code: mount -t xfs -o rtdev=/dev/hda5 /dev/hda8 /xfs But I don't know how can I use this partition hda5 with subvolume real-time. I don't know how to create directories, copy files to it and another. Thanks for all answers!
EDIT:in manual it is writen: The realtime section is used to store the data of realtime files.These files had an attribute bit set through xfsctl(3) after file creation, before any data was written to the file.
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Dec 7, 2009
I've got the following problem:
1. I start two bash windows
2. In one of them I start a script test1:
Code:
This script puts a natural number 5 times a second.
3. Then in the second bash window I type (as root):
Code:
The script test2 looks as follows:
Code:
While true; do
true;
done
During the following 15 seconds test2 is the process with the highest real-time priority. As far as I know the script doesn't perform any system calls so it shouldn't be suspended even for a minimal timeslice. My question is: why the process test1 manages to put a few numbers on the screen before test2 stops. I thought that test2 would exclusivly own the processor for 15 seconds.
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Jan 17, 2011
I have to write one Shell script where i have to find one word in current generated log.Log name has specific format like 'NAME_DDMMYY_HHMMSS'.log.Each time i have to go and check the word in newly generated log.How can i pass the newly generated log name in my Script?
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Feb 1, 2010
I am currently using curlftps to mount a directory on a ftp server locally as /backup , I then use rsync to do an incremental backup to this directory every night and a full backup at the weekend.A requirement has arose for a similar set up but one that syncs in real time, so if a user puts a file in a directory it immediately copies that file to my ftp server, in this case it immediately copies it to /backup
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Mar 20, 2009
I want to start real time programming for linux(RTOS) so where I can get the basic of programming.I want to do it in C language..
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Sep 11, 2009
I seed a suggesting related asychron io. I'm write a program which use completion ports, but wandor how avoiding loops like for(; below...i.e I want parse proto with count in first and then computing some quantity of pieces. how that make with aio?
Code:
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Sep 17, 2010
why Linux doesn't have real-time voice changers? Or why the Windows version don't even works with wine?
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