Ubuntu :: How To Edit Kernel Boot Parameters

Jun 18, 2010

Ubuntu 10.04 Gnome IBM Thinkpad 600e.I am trying to get sound going in my 600e which has the wrong chips in the sound card. I found some notes from 2008 that said in one of the steps to add the following to my kernel boot parameters: noapci nolapci notsc acpi=off pnpbios=off pci=noacpi

It said to hit the Esc key when I see the Grub Count on boot up to get into the kernel boot parameter's editor. However, I am not seeing any Grub Count and pressing the Esc key every second during boot up doesn't seem to get me there either. I have been searching for how to edit the boot parameters but no luck so far.

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General :: Find Out Exact Kernel Parameters When Corrupt Boot Loader?

Feb 8, 2010

How do i find out the exact kernel parameters (from the grub config file) when the boot loader is corrupt. Seems like a catch 22 that I need the exact boot parameters when I cant get to a prompt to read the grub.conf file to being with.

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General :: Don't See The Grub Menu To Say Edit The Boot Kernel

Jan 31, 2010

In my Red Hat 7.2 , the /boot/grub/grub.conf has the following data :

But when I reboot my Red Hat server , I don't see the Grub menu to say edit the boot kernel .

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Server :: Cannot Set Kernel Parameters / What To Do?

Feb 8, 2011

I have a strange problem with RHEL4.7, with kernel 2.6.9-78.

I cannot set any kernel parameters by editing sysctl.conf file and run sysctl -p, everytime the old value appears, while it was possible before.

I tried to edit files under /proc by using vi when trying to save it gives me: E667: Fsync failed!
While echo 1>/proc/sys/net/ipv4/ip_forward also cannot edit the file.

Also I mounted proc device on another mount point:

# mount -t proc proc /mnt

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Ubuntu Installation :: Kernel Parameters : How To Modify Them

Feb 4, 2010

Bottom line first: Is there a GUI or otherwise friendly tool to modify the kernel parameters? One that will give help on a highlighted parameters?

Now as to my reason for this question:

In preparing for an Informix installation, I may need to change some kernel parameters. I could follow the advice of G�rard BIGOT from a couple of years ago at this URL. However, messing with the kernel this way, by directly editing /etc/sysctl.conf, is a bit scary. I have already backed up the current one and started editing according the Informix machine notes. However, I have commented out my new settings. [:Chicken]

The scariest aspect of this is that the notes recommend settings to kernel parameters that I do not find in /proc/sys/kernel. for example, it recommends setting SHMMIN to 1 but when I can /proc/sys.kernel/shmmin, there is no such file. (I did find shmmax.) Similarly for the very logical shmseg (max number of shared memory segments) - not found. I am afraid to add these into sysctl.conf if the equivalent pseudo-files don't exist.

Additional question: Where [on-line] do I find all kernel parameters documented? This is so that I am more certain of what I am doing instead of relying on my memory. For example, I don't recall the names of the parameters that control Kernel-Asynchronous I/O (KAIO) events.

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Ubuntu :: Cannot Save GRUB Kernel Parameters

Apr 27, 2011

We're using 10.10-server. We are trying to make grub boot changes permanent. I've already looked at thread [URL]. We updated /etc/default/grub, and update-grub propagates those changes into /boot/grub/grub.cfg, but not into menu.lst. It appears to use menu.lst as the source at boot, so our change doesn't show up as a linux parm.

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Installation :: Grub2 Not Passing Parameters To Kernel?

Sep 8, 2010

I have installed grub2 on a flash drive to boot some os's that I want to carry around. But in grub.cfg when i put this:

Code: menuentry "BackTrack Persistent" {
set gfxpayload=1024x768
linux/backtrack/boot/vmlinuz BOOT=casper boot=casper persistent rw quiet
initrd/backtrack/boot/initrd.gz
} it does exactaly the same thing as this

[Code]....

I'm thinking of filing a bug report but I want to make sure i'm not doing something wrong first.

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General :: How Increasing RAM Affects Kernel Parameters

Nov 16, 2010

We just doubled the RAM on our RHEL 4 production servers...Oracle from 16gb to 32gb and Apache/JBoss from 8 to 32 gb. I am trying to figure out how to get the biggest bang from the increased RAM. Should kernel.shmmax be upped to be 50% of the 32gb....from its current 8gb? I need to create the largest possible SGA and was unable to do so, apparently because the kernel.shmmax value had gone unchanged.

And for the JBoss web servers, also RHEL 4, and particular kernel changes which can take advantage of the increased RAM and provide an immediate performance improvement?

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Fedora :: Subject - Modify Only Parameters In Kernel Config

Aug 28, 2009

I want to start to play with "homemade" kernels. (To get some experiences in this subject). I want to do this step-by-step. I have already read a lot about this. I have a Fedora 10 running. So I want to start with this. I have read that there is a "special" way to create a kernel for Fedora. [URL] OK. I understand this +/-. When you build a new kernel with an other version number, you have to rebuild all the modules with this new kernelversion, and you have to install these also.

But : I want to start with modify only some parameters in my kernel config. Do I need to rebuild and re-install the modules also? Will it not be enough to rebuild only the kernel? (vmlinuz) Where can I find some information about the options I can disable in my kernel to speedup my system? (boot process ed). I want to suppress the loading of unneeded modules. I want to understand the options in menuconfig (and there are a lot of options ! ! )

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Ubuntu Installation :: Set The Kernel Parameters To Perform An Unattended Install Using Preseed File?

Oct 23, 2010

I would like to create an unattended install ubuntu 10.10 cd. I have followed the ubuntu [URL].. on creating the preseed file, however, I can't find any useful tutorial on how to set the kernel parameters to perform an unattended install using my preseed file.

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Programming :: Insmod: Error Inserting 'kernel.ko': -1 Invalid Parameters?

Jan 16, 2010

insmod: error inserting 'kernel.ko': -1 Invalid parametersI am getting this error when i am try to insert kernel.ko into kernelMy systemfedora 12 with gcc 4.4.2insmod kernel.koinsmod: error inserting 'kernel.ko': -1 Invalid parametersmy program

__________________kernel.c________________________ ___________

#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */

[code].....

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Fedora :: New Kernel - New Audio - Disable Feature - Tweak The Parameters Like Crossover Frequency?

Sep 1, 2010

i have an hp pavilion dv7 and am using f13 64bit. my laptop has a built in woofer underneath that i have never been able to get to work. after the latest kernel update today my laptop now has woofer sound. there must be some new support for my laptops audio card. the problem is that it is a little overbearing. how can i a) disable this feature b) tweak the parameters like crossover frequency or gain? edit: i checked the changelog for 2.6.34 and couldn't find any info on any new audio support features.

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Ubuntu :: Trying To Patch 10.10 I686 - 1 Out Of 1 Hunk FAILED -- Saving Rejects To File Linux-2.6/Documentation/kernel-parameters.txt.rej

Nov 16, 2010

I saw this forum post and I want to try it out so I went here and copied and pasted the following text into a file called test.patch.

Code:
---
Documentation/kernel-parameters.txt | 2
drivers/tty/tty_io.c | 1
include/linux/sched.h | 19 ++++
init/Kconfig | 12 +++
kernel/fork.c | 5 +
kernel/sched.c | 25 ++++--
kernel/sched_autogroup.c | 140 ++++++++++++++++++++++++++++++++++++
[Code]....

1 out of 1 hunk FAILED -- saving rejects to file linux-2.6/Documentation/kernel-parameters.txt.rej I'm not so good with patching so I am sure it is probably something easy.

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Ubuntu Installation :: Setting Boot Parameters For 10.10?

Apr 28, 2011

My keyboard doesn't work after the bootloader.

I've read that I need to add "i8042.nopnp=1 i8042.dumbkbd=1" to the boot options.

I have a 10.10 factory disk.

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Ubuntu :: Change Boot Parameters In Grub2?

Aug 10, 2011

I have a mental block whenever I'm confronted with anything to do with grub2. Changing things in menu.lst was SO much simpler....

I want to include the command 'acpi=off' - but where do I put it? Can I change the detail of an existing grub entry in this way, or do I have to create a complete custom menu entry in grub.d and include it in that?

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Ubuntu :: Pass Parameters To Grub At Boot Time?

May 2, 2010

Old Toshiba laptop model A30 -- tried various installs 8.04/9.04/9.10. They all hung trying to boot the install disks after the initial few screens. Finally, I got 9.10 to install, dual booting XP and 9.10 by choosing F6 from the initial menu, and putting an X beside:

ACPI=off
noapic
nolapc
edd=on
nodmaid

and then hitting escape.But, after the install, I couldn't boot 9.10 from grub as it hangs after about 30 seconds of trying. The live CD would not work without the above parameters being set as described above, but does work with them set! I need those same parameters passed to grub at 9.10 boot time, but I can't figure out how to do that. I've had many successful installs of Ubuntu across a number of desktops and laptops, but I never had to deal with the guts of grub before. It all just worked.

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Debian Configuration :: Permanently Add Boot Parameters?

Mar 12, 2011

I installed Debian 6 last night on an older Compaq. For the system to properly reboot and shutdown when requested, both acpi=force and reboot=warm must be in the boot parameters, this was required with other Linux distros installed on this hardware. Otherwise, the system erroneously shuts down when reboot is chosen.

I would like to know how to permanently add these so they pass each time the system is turned on.

I already added these to /etc/default/grub (and ran update-grub afterwards) and at the next startup, noticed they were NOT in the parameters when "e" was pressed at the boot menu.

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Debian Installation :: Setup Installer Boot Parameters

Jul 16, 2015

I'm making some tests with Debian Setup.

As reported by the docs [URL] .... there are some boot parameters available for the Debian Installer.

I would like to try a setup setting the base-installer/install-recommends to false.

This can be done via preseeding, but I'd like to try it out setting the boot parameter.

I've tried several combinations but no one has been effective.

What is the syntax for setting the base-installer/install-recommends parameter to false at boot time?

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OpenSUSE Install :: Mkinitrd And Encrypted /var - What Boot Parameters?

Aug 16, 2011

I've installed opensuse 11.4 by doing a network install, (boot off kernel + initrd, everything else is fetched off network) and i skipped the bootloader part because i've already got two other linux systems set up with grub2 on my computer. I picked the minimal server install (text mode) and didn't make any other software selectiono changes.

My partition layout is as follows

ssd drive contains / partitions for distributions (GPT layout) hdd drive contains encrypted lvm PV (PV on a luks partition). inside that PV is a VG with volumes for /home and /var (and other), where each distribution has its own /var.

The problem is that i cannot get initrd to open the luks properly. i tried chrooting, rebuilding the image with mkinitrd -f "lvm2 luks" ( i saw that somewhere on opensuse wiki, i think ) and adding boot parameters like this : lvm_box=/dev/disk/by-uuid/<luks partiiton UUID> lvm="box" (where box is the name of the lvm array).

[Code]...

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General :: Make Boot Parameters Permanent In Sugar?

Feb 2, 2010

I have a generic monitor which has problems with many Linux distros. We can boos Sugar on a Stick v2 by pressing <tab> at the Sugar splash screen and adding the boot parameter "nomodeset". I'm handy enough to do this, but my wife, well, not so much. So is there a way to make that boot parameter permanent?

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Ubuntu :: HP Envy 14 - Boot Into Live CD Without Changing Any Parameters Results In A Black Screen

Feb 8, 2011

I own an HP Envy 14 [url]. Letting Ubuntu (or any Linux) attempt to boot into a Live CD without changing any parameters results in a black screen, but with everything else working (for Ubuntu, that means the login sound is played). I've discovered that putting nomodeset in the kernel line will allow me to get so far as a command line, but I can't startx from here (I get "Screen(s) found, but none have a usable configuration."). I think my issues have something to do with the dual/switchable graphics in my laptop.

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Ubuntu :: Edit To Change Boot Order And Various Boot Selections?

Jan 6, 2010

I upgraded from XP to Windows 7 (I need this for legacy business) and decided to install Ubuntu permanently rather than using from CD. During an Ubuntu session I was prompted to upgrade, which I did, but when I boot up now, there seems to be 2 versions of Ubuntu which I can choose from the boot up menu, plus the usual mem test, safe mode etc, plus the option to boot Windows 7.

Firstly, is there in fact more than one Ubuntu image (and therefore precious disk space taken up), how do I find out, and if so what action should I take?If there is only one Ubuntu and one Windows 7 image, how do I edit (and where is the file) to change the boot order and the various boot selections?

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Ubuntu :: Takes To Edit The Kernel Source And Build It With Modifications?

Nov 22, 2010

This feels like dumb question but here goes...I am wondering what it takes to edit the Linux kernel source and build it with my modifications!

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General :: Edit Grub.cfg After Kernel Compilation?

Dec 24, 2010

I am compiling a new kernel. I have successfully compiled it, how to modify grub.cfg. I am using ubuntu 10.10.

Can I use 'update-grub' ?

I tried using that and even its updating the grub with new kernel. But after I boot the new kernel its showing

The disk for / is not ready or does not exist

#and some statements# M for recovery ...

Is there any problem with kernel compilation and why is that coming ?

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Debian :: Edit The File Shmmax In Proc/sys/kernel?

Jun 24, 2010

I am trying to edit the file shmmax in proc/sys/kernel/. I want to increase the value. I am using vim to edit it. But when I try to write and close the file I get the following error: "shmmax" E667: Fsync failed Press ENTER or type command to continue

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Programming :: How To Edit Kernel Source Code In MS Visual Studio

Apr 27, 2010

I want to edit linux kernel source code in MS Visual Studio. I saw the code and these are c files but there is no project file that i open it and whole project opens up. I can open each individual file but not the whole project.

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Debian :: E667: Fsync Failed - Edit The File Shmmax In Proc/sys/kernel/?

Jun 24, 2010

I am trying to edit the file shmmax in proc/sys/kernel/. I want to increase the value. I am using vim to edit it. But when I try to write and close the file I get the following error:
Quote:

"shmmax" E667: Fsync failed
Press ENTER or type command to continue

I have read that this can be cause by a full disk. I checked with df and have plenty of space available.

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Fedora :: Kernel Update Doesn't Edit Grub.conf Vmlinuz And Initramfs Missing?

Dec 23, 2010

after yesterday's update to kernel 2.6.35.10-72 my grub.conf didn't get updated and ll /boot shows that neither vmlinuz or initramfs exist for that kernel. uname -r though tells me I'm running 2.6.35.10-72.

How can I do that? and on another more reallystic matter how can I generate the missing files so I can manually update grub.conf?

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Ubuntu :: Edit My Boot Options In 10.04?

Aug 3, 2010

How can i edit my boot options in Ubuntu 10.04

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Ubuntu :: How To Edit GRUB Boot List

Mar 5, 2010

I'm using HP Pavilion dv2108tx I have ubuntu and Win7 dual boot. The problem is every time I change setting to the BIOS there will be a new list of ubuntu boot came up and now I scroll trough the whole list. Is there anyway to edit GURB boot list.

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