4

In a fresh ubuntu-studio 14.04 install sudo apt-get install linux-generic.

Then the grub-mkconfig will give you a menu as such

Ubuntu (lowlatency)
Ubuntu
Advanced options for Ubuntu

A quick look with the 'e' key will show that both Ubuntu (lowlatency) and Ubuntu point to 

linux   /boot/vmlinuz-3.13.0-24-lowlatency

A work around is you can select the desired kernel in the 'Advanced option for Ubuntu' menu.

How can we fix /etc/grub.d/09_lowlatency and /etc/grub.d/10_linux so that they don't select the same default kernel?

Relevant menuentry in /boot/grub/grub.cfg from /etc/grub.d/09_lowlatency

menuentry 'Ubuntu (lowlatency)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-0f6e1051-cf9f-4299-b691-76d0d8c532d1' {
recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  0f6e1051-cf9f-4299-b691-76d0d8c532d1
        else
          search --no-floppy --fs-uuid --set=root 0f6e1051-cf9f-4299-b691-76d0d8c532d1
        fi
        linux   /boot/vmlinuz-3.13.0-24-lowlatency root=UUID=0f6e1051-cf9f-4299-b691-76d0d8c532d1 ro   quiet splash $vt_handoff
        initrd  /boot/initrd.img-3.13.0-24-lowlatency
}

And the menu entry in /boot/grub/grub.cfg from /etc/grub.d/10_linux

menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-0f6e1051-cf9f-4299-b691-76d0d8c532d1' {
        recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  0f6e1051-cf9f-4299-b691-76d0d8c532d1
        else
          search --no-floppy --fs-uuid --set=root 0f6e1051-cf9f-4299-b691-76d0d8c532d1
        fi
        linux   /boot/vmlinuz-3.13.0-24-lowlatency root=UUID=0f6e1051-cf9f-4299-b691-76d0d8c532d1 ro  quiet splash $vt_handoff
        initrd  /boot/initrd.img-3.13.0-24-lowlatency
}

Yes I assure you I have a normal kernel installed:

$ ls -l /vmlinuz*
lrwxrwxrwx 1 root root 30 May  5 20:37 /vmlinuz -> boot/vmlinuz-3.13.0-24-generic
lrwxrwxrwx 1 root root 33 May  2 20:25 /vmlinuz.old -> boot/vmlinuz-3.13.0-24-lowlatency
N8tron
  • 734

2 Answers2

2

  1. Open /etc/grub.d/10_linux for editing

  2. Look for kernel list loop:

    machine=`uname -m`
case "x$machine" in
    xi?86 | xx86_64)
        list=`for i in /boot/vmlinuz-* /vmlinuz-* /boot/kernel-* ; do
                  if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
              done` ;;
    *)
        list=`for i in /boot/vmlinuz-* /boot/vmlinux-* /vmlinuz-* /vmlinux-* /boot/kernel-* ; do
                  if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
             done` ;;
esac

  3. Add if clause to skip lowlatency kernels

    machine=`uname -m`
case "x$machine" in
    xi?86 | xx86_64)
        list=`for i in /boot/vmlinuz-* /vmlinuz-* /boot/kernel-* ; do
                  if [ -z "${i##*lowlatency}" ] ; then continue ; fi
                  if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
              done` ;;
    *)
        list=`for i in /boot/vmlinuz-* /boot/vmlinux-* /vmlinuz-* /vmlinux-* /boot/kernel-* ; do
                  if [ -z "${i##*lowlatency}" ] ; then continue ; fi
                  if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
             done` ;;
esac

  4. Update Grub list

    sudo update-grub2
user.dz
  • 49,176
1

In the entry from "/etc/grub.d/10_linux", there's these lines.

 linux   /boot/vmlinuz-3.13.0-24-lowlatency root=UUID=0f6e1051-cf9f-4299-b691-76d0d8c532d1 ro  quiet splash $vt_handoff
    initrd  /boot/initrd.img-3.13.0-24-lowlatency

I believe that if you change both instances of "lowlatency" as read in these lines to "generic", you may solve the problem. If you can, report back with results. I've not seen a case like this before.

Drew Stewart
  • 611