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Thread: Kernel Boot messages broken

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  1. #1
    Join Date
    Oct 2006
    Location
    hong kong, sydney
    Beans
    163
    Distro
    Kubuntu 14.04 Trusty Tahr

    Kernel Boot messages broken

    Have racked my brains about this for months, and spent a couple of days
    messing with every option I can think of,
    and while I now understand better the problem
    I cannot fix it.

    THE PROBLEM - SIMPLIFIED
    I like a noisy boot, with lots of messages
    that tell me what is happening, what is causing delays,
    what has failed (in case of non-boot) etc,
    not to mention impressing the pants off Windows admins.

    Up to Kubuntu 10.10 I could easily get this just by
    removing the "splash quiet" options from the grub kernel line.

    But with Kubuntu 11.04, even after I remove "splash quiet",
    then during boot, after the grub screen
    I get a 15" (Fifteen second!!!) black screen,
    then finally a few text lines, then the login prompt.

    THE PROBLEM - DETAIL
    Up to 10.10, the boot console would display kernel messages
    (as shown after boot by dmesg)
    and boot log messages (as in /var/log/boot.log)
    mixed together.

    From 11.04, the boot console only shows boot log messages,
    the kernel messages are missing,
    which leads to a mostly black screen booting process.

    In fact I can see that the kernel messages seem to be going to tty1
    (can see them there when I temp switch to tty1 at the gui login prompt).
    So I could probably fix this problem if I could get these kernel
    messages back to tty7,
    which I think is where boot happens?

    But editing /etc/default/grub to:
    GRUB_CMDLINE_LINUX="vga=795 console=tty7 loglevel=7"
    does not return the kernel messages to the boot console where I can see them.

    I realize my love of a noisy, turbulent boot process is against the march of progress
    but if anyone knows how to get back my lovely, informative, educational, verbose boot process, I would be grateful

  2. #2
    Join Date
    May 2008
    Location
    Berks, UK
    Beans
    1,387

    Re: Kernel Boot messages broken

    As a desperation measure you could try the effect of noquiet and nosplash options - I seem to remember seeing these in use at some point.
    Derek

  3. #3
    Join Date
    Oct 2006
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    hong kong, sydney
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    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: Kernel Boot messages broken

    Remarkably, nosplash brings back the splash screen, interesting but not useful.

    noquiet does nothing.

    Not surprising really as I think the messages are getting logged, but just not to the boot console.

  4. #4
    Join Date
    May 2008
    Location
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    Beans
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    Re: Kernel Boot messages broken

    That's curious - I haven't seen quite that effect with the splash, but have seen noquiet apparently ignored.

    I've just recalled that in the last couple of days I've seen difference between what happens when you use grub original as opposed to grub 2 (so called) - I have these on two different PCs - but didn't spend any time to chase it down, after all, life's just too short for some trivia.
    Derek

  5. #5
    Join Date
    Jan 2007
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: Kernel Boot messages broken

    Are you using a theme or grub background image by chance?

    Your frustration has been expressed by others. A few days ago I found that if I turned off a theme I'd employed for testing I was able to get the boot text back. The theme didn't seem to care whether I had 'quiet splash' or not - it wouldn't display the text even after passing control to the kernel.
    GRUB2

    Retired.

  6. #6
    Join Date
    Oct 2006
    Location
    hong kong, sydney
    Beans
    163
    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: Kernel Boot messages broken

    Am not using themes or grub background images, so that won't be the problem.

    Am using grub 1.99-rc1 in 11.04
    whereas 10.10 (which boots correctly) uses 1.98.
    However both are grub2, so it is not a grub1 / grub2 difference.

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