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Thread: Understanding GRUB_CMDLINE_LINUX_DEFAULT

  1. #1
    Join Date
    Apr 2014
    Beans
    2

    Understanding GRUB_CMDLINE_LINUX_DEFAULT

    Hello,

    I am quite a beginner with Ubuntu which I like very much but does give me severall troubles. I actually use Xubuntu 13.10 and I am running it on a Sony Vaio with a ATI radeon graphic card. The processor is a little old, I am talking about a Intel Core Duo 2.

    I need some clarification on the GRUB_CMDLINE_LINUX_DEFAULT line which can be found in the grub file. Basically a few days ago I had the problem that every time I would close the lid of my laptop or the PC would go to suspend when I then would turn the PC on again it would actually reboot and not simply allow me to re-enter in the OS.
    To fix this I found that changing

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    to
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_sleep=nonvs"

    would solve this.

    Later I had another problem, no audio came out from my TV speakers when I would connect my PC to it via HDMI.

    To fix this I found that changing:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    to
    #GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1"

    would solve it.

    Now, of course I seems I need to choose, either having the PC not rebooting everytime it suspends OR having HDMI audio and this is annoying.

    So my question is, what exavtly is the GRUB_CMDLINE_LINUX_DEFAULT and how can I keep both lines working together?

    Thanks a lot for your help!
    Jack

    P.S: of course after each grub file editing I always updated the grub via sudo update-grub.

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Understanding GRUB_CMDLINE_LINUX_DEFAULT

    Hello and welcome to the forums. I'm going to move this thread to General Help - it really isn't an Absolute Beginner's type question.

    So my question is, what exavtly is the GRUB_CMDLINE_LINUX_DEFAULT and how can I keep both lines working together?
    GRUB_CMDLINE_LINUX_DEFAULT contains command line arguments to the linux kernel. You can put as many as you want there provided they are separated by a space. In your case, you could use:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_sleep=nonvs radeon.audio=1"
    ...and they will all be passed to the kernel.

  3. #3
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
    Beans
    6,403
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Understanding GRUB_CMDLINE_LINUX_DEFAULT

    jackkk2; Hi !

    Might try these edits also, and see what results: {always make a backup prior to editing any file}
    "GRUB_DEFAULT=0" -> GRUB_DEFAULT=saved
    "GRUB_HIDDEN_TIMEOUT=0" -> #GRUB_HIDDEN_TIMEOUT=0 (add a 'comment' character to comment out the line)
    "GRUB_HIDDEN_TIMEOUT_QUIET=true -> GRUB_HIDDEN_TIMEOUT_QUIET=false

    For full documentation see:
    https://help.ubuntu.com/community/Grub2
    as a great place to start learning grub.

    hope this helps
    THE current(cy) in Documentation:
    https://help.ubuntu.com/community/PopularPages

    Happy ubutu'n !

  4. #4
    Join Date
    Apr 2014
    Beans
    2

    Re: Understanding GRUB_CMDLINE_LINUX_DEFAULT

    Hello! Thank you both for your help and very fast feedback!
    I was pretty sure I had tried what you advised Toz but maybe I didn't wrong earlier, I tried again and it seems to work! At least the PC doesn't reboot after it suspens. I still need to check the HDMI audio on the TV but I am confident.

  5. #5
    Join Date
    Aug 2009
    Beans
    3,195
    Distro
    Ubuntu Development Release

    Re: Understanding GRUB_CMDLINE_LINUX_DEFAULT

    That is odd. All I have ever had for that line is GRUB_CMDLINE_LINUX_DEFAULT="quiet splash".

    I wonder if the fact that you have a radeon video card has anything to do with it. I have an nvidia card.

    From Ubuntu 9.04 (Jaunty Jackalope) to Ubuntu 14.04 LTS (Trusty Tahr) and every single version in between all I have ever used is the above command.
    Check Java Version | Install Java via WEB UPD8 PPA
    Creating a Custom Maintenance Free GRUB2 Screen Community Wiki
    Ubuntu 12.04 | 14.04 | 14.10 | Mint 13 | Mint 17 | Windows 7 | All 64 bit

  6. #6
    Join Date
    Jan 2013
    Beans
    181

    Re: Understanding GRUB_CMDLINE_LINUX_DEFAULT

    I have to edit that line as well on my laptop. It was a problem with keyboard and touchpad not being used in Ubuntu. It has AMD GPU though.

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