$ cat /mnt/gentoo/etc/default/grub
GRUB_DEFAULT="0"
GRUB_HIDDEN_TIMEOUT_QUIET="false"
GRUB_TIMEOUT="10"

GRUB_BACKGROUND="/boot/grub2/for-grub-1600-1200-0057-1080p.png"
GRUB_CMDLINE_LINUX="splash quiet vga=795 noapic acpi=off"
GRUB_CMDLINE_LINUX_DEFAULT="splash quiet vga=795 noapic acpi=off"
GRUB_GFXMODE="1024x768"

$ cat /mnt/gentoo/boot/grub2/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos10)'
search --no-floppy --fs-uuid --set=root 6f9c97fe-bea8-467f-a3be-5a124224970a
if loadfont /share/grub2/unicode.pf2 ; then
  set gfxmode=1024x768
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod reiserfs
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set=root ead6564b-03af-44a6-b645-1c948bd47cca
insmod png
background_image -m stretch /boot/grub2/for-grub-1600-1200-0057-1080p.png
set timeout=10
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux_proxy ###
menuentry "GNU/Linux, с Linux x86_64-3.1.2-zen+" --class gnu-linux --class gnu --class os {
    load_video
    insmod gzio
    insmod part_msdos
    insmod reiserfs
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set=root ead6564b-03af-44a6-b645-1c948bd47cca
    echo    'Загружается Linux x86_64-3.1.2-zen+ ...'
    linux    /boot/kernel-genkernel-x86_64-3.1.2-zen+ root=/dev/sdb1 ro splash quiet vga=795 noapic acpi=off splash quiet vga=795 noapic acpi=off
    echo    'Загружается начальный ramdisk ...'
    initrd    /boot/initramfs-genkernel-x86_64-3.1.2-zen+
}
menuentry "GNU/Linux, с Linux x86_64-3.1.2-zen+ (режим восстановления)" --class gnu-linux --class gnu --class os {
    load_video
    insmod gzio
    insmod part_msdos
    insmod reiserfs
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set=root ead6564b-03af-44a6-b645-1c948bd47cca
    echo    'Загружается Linux x86_64-3.1.2-zen+ ...'
    linux    /boot/kernel-genkernel-x86_64-3.1.2-zen+ root=/dev/sdb1 ro single splash quiet vga=795 noapic acpi=off
    echo    'Загружается начальный ramdisk ...'
    initrd    /boot/initramfs-genkernel-x86_64-3.1.2-zen+
}
menuentry "GNU/Linux, с Linux x86_64-3.1.1-gentoo" --class gnu-linux --class gnu --class os {
    load_video
    insmod gzio
    insmod part_msdos
    insmod reiserfs
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set=root ead6564b-03af-44a6-b645-1c948bd47cca
    echo    'Загружается Linux x86_64-3.1.1-gentoo ...'
    linux    /boot/kernel-genkernel-x86_64-3.1.1-gentoo root=/dev/sdb1 ro splash quiet vga=795 noapic acpi=off splash quiet vga=795 noapic acpi=off
    echo    'Загружается начальный ramdisk ...'
    initrd    /boot/initramfs-genkernel-x86_64-3.1.1-gentoo
}
menuentry "GNU/Linux, с Linux x86_64-3.1.1-gentoo (режим восстановления)" --class gnu-linux --class gnu --class os {
    load_video
    insmod gzio
    insmod part_msdos
    insmod reiserfs
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set=root ead6564b-03af-44a6-b645-1c948bd47cca
    echo    'Загружается Linux x86_64-3.1.1-gentoo ...'
    linux    /boot/kernel-genkernel-x86_64-3.1.1-gentoo root=/dev/sdb1 ro single splash quiet vga=795 noapic acpi=off
    echo    'Загружается начальный ramdisk ...'
    initrd    /boot/initramfs-genkernel-x86_64-3.1.1-gentoo
}
### END /etc/grub.d/10_linux_proxy ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober_proxy ###
menuentry "Debian GNU/Linux, with Linux 3.1-1.slh.1-aptosid-amd64 (on /dev/sda1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod reiserfs
    set root='(hd0,msdos1)'
    search --no-floppy --fs-uuid --set=root 0b72ab7e-7dc7-4afb-96f2-c5d4bc376655
    linux /boot/vmlinuz-3.1-1.slh.1-aptosid-amd64 root=UUID=0b72ab7e-7dc7-4afb-96f2-c5d4bc376655 ro quiet vga=792 nomodeset nouveau.modeset=0
    initrd /boot/initrd.img-3.1-1.slh.1-aptosid-amd64
}
menuentry "Gentoo Base System release 2.1 (on /dev/sda7)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod reiserfs
    set root='(hd0,msdos7)'
    search --no-floppy --fs-uuid --set=root f960b405-1099-4d92-916a-9ed39bf2e9f1
    linux /boot/kernel-genkernel-x86_64-2.6.38.5-zen-libre root=/dev/sda7
    initrd /boot/initramfs-genkernel-x86_64-2.6.38.5-zen-libre
}
menuentry "Gentoo Base System release 2.1 (on /dev/sda7) ZEN-KERNEL 3.1.4" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod reiserfs
    set root='(hd0,msdos7)'
    search --no-floppy --fs-uuid --set=root f960b405-1099-4d92-916a-9ed39bf2e9f1
    linux /boot/kernel-genkernel-x86_64-3.1.4-zen+ root=/dev/sda7
    initrd /boot/initramfs-genkernel-x86_64-3.1.4-zen+
}
menuentry "Debian GNU/Linux, with Linux 3.0-4.slh.3-aptosid-amd64 (on /dev/sda1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod reiserfs
    set root='(hd0,msdos1)'
    search --no-floppy --fs-uuid --set=root 0b72ab7e-7dc7-4afb-96f2-c5d4bc376655
    linux /boot/vmlinuz-3.0-4.slh.3-aptosid-amd64 root=UUID=0b72ab7e-7dc7-4afb-96f2-c5d4bc376655 ro quiet vga=792 nomodeset nouveau.modeset=0
    initrd /boot/initrd.img-3.0-4.slh.3-aptosid-amd64
}
### END /etc/grub.d/30_os-prober_proxy ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

linux    /boot/kernel-genkernel-x86_64-3.1.2-zen+ root=/dev/sdb1 ro splash quiet vga=795 noapic acpi=off splash quiet vga=795 noapic acpi=off

linux /boot/vmlinuz-3.1-1.slh.1-aptosid-amd64 root=UUID=0b72ab7e-7dc7-4afb-96f2-c5d4bc376655 ro quiet vga=792 nomodeset

linux /boot/kernel-genkernel-x86_64-3.1.4-zen+ root=/dev/sda7

GRUB_CMDLINE_LINUX_DEFAULT="quiet vga=792 nomodeset nouveau.modeset=0"

GRUB_CMDLINE_LINUX_DEFAULT=""

GRUB_CMDLINE_LINUX=""

#! /bin/sh
set -e

# grub-mkconfig helper script.
# Copyright (C) 2006,2007,2008,2009  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.

prefix=/usr
exec_prefix=${prefix}
libdir=/lib64

. ${libdir}/grub/grub-mkconfig_lib

if [ "x${GRUB_DISABLE_OS_PROBER}" = "xtrue" ]; then
  exit 0
fi

if [ -z "`which os-prober 2> /dev/null`" -o -z "`which linux-boot-prober 2> /dev/null`" ] ; then
  # missing os-prober and/or linux-boot-prober
  exit 0
fi

OSPROBED="`os-prober | tr ' ' '^' | paste -s -d ' '`"
if [ -z "${OSPROBED}" ] ; then
  # empty os-prober output, nothing doing
  exit 0
fi

osx_entry() {
        cat << EOF
menuentry "${LONGNAME} (${2}-bit) (on ${DEVICE})" --class osx --class darwin --class os {
EOF
    save_default_entry | sed -e "s/^/\t/"
    prepare_grub_to_access_device ${DEVICE} | sed -e "s/^/\t/"
    cat << EOF
        load_video
        set do_resume=0
        if [ /var/vm/sleepimage -nt10 / ]; then
           if xnu_resume /var/vm/sleepimage; then
             set do_resume=1
           fi
        fi
        if [ \$do_resume = 0 ]; then
           xnu_uuid ${OSXUUID} uuid
           if [ -f /Extra/DSDT.aml ]; then
              acpi -e /Extra/DSDT.aml
           fi
           $1 /mach_kernel boot-uuid=\${uuid} rd=*uuid
           if [ /System/Library/Extensions.mkext -nt /System/Library/Extensions ]; then
              xnu_mkext /System/Library/Extensions.mkext
           else
              xnu_kextdir /System/Library/Extensions
           fi
           if [ -f /Extra/Extensions.mkext ]; then
              xnu_mkext /Extra/Extensions.mkext
           fi
           if [ -d /Extra/Extensions ]; then
              xnu_kextdir /Extra/Extensions
           fi
           if [ -f /Extra/devprop.bin ]; then
              xnu_devprop_load /Extra/devprop.bin
           fi
           if [ -f /Extra/splash.jpg ]; then
              insmod jpeg
              xnu_splash /Extra/splash.jpg
           fi
           if [ -f /Extra/splash.png ]; then
              insmod png
              xnu_splash /Extra/splash.png
           fi
           if [ -f /Extra/splash.tga ]; then
              insmod tga
              xnu_splash /Extra/splash.tga
           fi
        fi
}
EOF
}

for OS in ${OSPROBED} ; do
  DEVICE="`echo ${OS} | cut -d ':' -f 1`"
  LONGNAME="`echo ${OS} | cut -d ':' -f 2 | tr '^' ' '`"
  LABEL="`echo ${OS} | cut -d ':' -f 3 | tr '^' ' '`"
  BOOT="`echo ${OS} | cut -d ':' -f 4`"

  if [ -z "${LONGNAME}" ] ; then
    LONGNAME="${LABEL}"
  fi

  echo "Found ${LONGNAME} on ${DEVICE}" >&2

  case ${BOOT} in
    chain)

      cat << EOF
menuentry "${LONGNAME} (on ${DEVICE})" --class windows --class os {
EOF
      save_default_entry | sed -e "s/^/\t/"
      prepare_grub_to_access_device ${DEVICE} | sed -e "s/^/\t/"

      case ${LONGNAME} in
    Windows\ Vista*|Windows\ 7*|Windows\ Server\ 2008*)
    ;;
    *)
      cat << EOF
    drivemap -s (hd0) \${root}
EOF
    ;;
      esac

      cat <<EOF
    chainloader +1
}
EOF
    ;;
    linux)
      LINUXPROBED="`linux-boot-prober ${DEVICE} 2> /dev/null | tr ' ' '^' | paste -s -d ' '`"
      prepare_boot_cache=

      for LINUX in ${LINUXPROBED} ; do
        LROOT="`echo ${LINUX} | cut -d ':' -f 1`"
        LBOOT="`echo ${LINUX} | cut -d ':' -f 2`"
        LLABEL="`echo ${LINUX} | cut -d ':' -f 3 | tr '^' ' '`"
        LKERNEL="`echo ${LINUX} | cut -d ':' -f 4`"
        LINITRD="`echo ${LINUX} | cut -d ':' -f 5`"
        LPARAMS="`echo ${LINUX} | cut -d ':' -f 6- | tr '^' ' '`"

        if [ -z "${LLABEL}" ] ; then
          LLABEL="${LONGNAME}"
        fi

    if [ "${LROOT}" != "${LBOOT}" ]; then
      LKERNEL="${LKERNEL#/boot}"
      LINITRD="${LINITRD#/boot}"
    fi

        cat << EOF
menuentry "${LLABEL} (on ${DEVICE})" --class gnu-linux --class gnu --class os {
EOF
    save_default_entry | sed -e "s/^/\t/"
    if [ -z "${prepare_boot_cache}" ]; then
      prepare_boot_cache="$(prepare_grub_to_access_device ${LBOOT} | sed -e "s/^/\t/")"
    fi
    printf '%s\n' "${prepare_boot_cache}"
    cat <<  EOF
    linux ${LKERNEL} ${LPARAMS}
EOF
        if [ -n "${LINITRD}" ] ; then
          cat << EOF
    initrd ${LINITRD}
EOF
        fi
        cat << EOF
}
EOF
      done
    ;;
    macosx)
      OSXUUID="`${grub_probe} --target=fs_uuid --device ${DEVICE} 2> /dev/null`"
      osx_entry xnu_kernel 32
      osx_entry xnu_kernel64 64
    ;;
    hurd)
      cat << EOF
menuentry "${LONGNAME} (on ${DEVICE})" --class hurd --class gnu --class os {
EOF
      save_default_entry | sed -e "s/^/\t/"
      prepare_grub_to_access_device ${DEVICE} | sed -e "s/^/\t/"
      grub_device="`${grub_probe} --device ${DEVICE} --target=drive`"
      mach_device="`echo "${grub_device}" | sed -e 's/(\(hd.*\),msdos\(.*\))/\1s\2/'`"
      grub_fs="`${grub_probe} --device ${DEVICE} --target=fs`"
      case "${grub_fs}" in
    *fs)    hurd_fs="${grub_fs}" ;;
    *)    hurd_fs="${grub_fs}fs" ;;
      esac
      cat << EOF
    multiboot /boot/gnumach.gz root=device:${mach_device}
    module /hurd/${hurd_fs}.static ${hurd_fs} --readonly \\
            --multiboot-command-line='\${kernel-command-line}' \\
            --host-priv-port='\${host-port}' \\
            --device-master-port='\${device-port}' \\
            --exec-server-task='\${exec-task}' -T typed '\${root}' \\
            '\$(task-create)' '\$(task-resume)'
    module /lib/ld.so.1 exec /hurd/exec '\$(exec-task=task-create)'
}
EOF
    ;;
    *)
      echo "  ${LONGNAME} is not yet supported by grub-mkconfig." >&2
    ;;
  esac
done
>       

    linux)
      LINUXPROBED="`linux-boot-prober ${DEVICE} 2> /dev/null | tr ' ' '^' | paste -s -d ' '`"
      prepare_boot_cache=

      for LINUX in ${LINUXPROBED} ; do
        LROOT="`echo ${LINUX} | cut -d ':' -f 1`"
        LBOOT="`echo ${LINUX} | cut -d ':' -f 2`"
        LLABEL="`echo ${LINUX} | cut -d ':' -f 3 | tr '^' ' '`"
        LKERNEL="`echo ${LINUX} | cut -d ':' -f 4`"
        LINITRD="`echo ${LINUX} | cut -d ':' -f 5`"
        LPARAMS="`echo ${LINUX} | cut -d ':' -f 6- | tr '^' ' '`"

        if [ -z "${LLABEL}" ] ; then
          LLABEL="${LONGNAME}"
        fi

    if [ "${LROOT}" != "${LBOOT}" ]; then
      LKERNEL="${LKERNEL#/boot}"
      LINITRD="${LINITRD#/boot}"
    fi

        cat << EOF

LKERNEL="${LKERNEL#/boot}"

LKERNEL="${LKERNEL#/boot} ${GRUB_CMDLINE_LINUX_DEFAULT}"

### BEGIN /etc/grub.d/30_os-prober_proxy ###
menuentry "Debian GNU/Linux, with Linux 3.1-1.slh.1-aptosid-amd64 (on /dev/sda1)" --class gnu-linux --class gnu --class os {
        insmod part_msdos
        insmod reiserfs
        set root='(hd0,msdos1)'
        search --no-floppy --fs-uuid --set=root 0b72ab7e-7dc7-4afb-96f2-c5d4bc376655
        linux /boot/vmlinuz-3.1-1.slh.1-aptosid-amd64 root=UUID=0b72ab7e-7dc7-4afb-96f2-c5d4bc376655 ro quiet vga=792 nomodeset nouveau.modeset=0
        initrd /boot/initrd.img-3.1-1.slh.1-aptosid-amd64
}
menuentry "Gentoo Base System release 2.1 (on /dev/sda7)" --class gnu-linux --class gnu --class os {
        insmod part_msdos
        insmod reiserfs
        set root='(hd0,msdos7)'
        search --no-floppy --fs-uuid --set=root f960b405-1099-4d92-916a-9ed39bf2e9f1
        linux /boot/kernel-genkernel-x86_64-2.6.38.5-zen-libre root=/dev/sda7
        initrd /boot/initramfs-genkernel-x86_64-2.6.38.5-zen-libre
}
menuentry "Gentoo Base System release 2.1 (on /dev/sda7)" --class gnu-linux --class gnu --class os {
        insmod part_msdos
        insmod reiserfs
        set root='(hd0,msdos7)'
        search --no-floppy --fs-uuid --set=root f960b405-1099-4d92-916a-9ed39bf2e9f1
        linux /boot/kernel-genkernel-x86_64-3.1.4-zen+ root=/dev/sda7
        initrd /boot/initramfs-genkernel-x86_64-3.1.4-zen+
}
menuentry "Debian GNU/Linux, with Linux 3.0-4.slh.3-aptosid-amd64 (on /dev/sda1)" --class gnu-linux --class gnu --class os {
        insmod part_msdos
        insmod reiserfs
        set root='(hd0,msdos1)'
        search --no-floppy --fs-uuid --set=root 0b72ab7e-7dc7-4afb-96f2-c5d4bc376655
        linux /boot/vmlinuz-3.0-4.slh.3-aptosid-amd64 root=UUID=0b72ab7e-7dc7-4afb-96f2-c5d4bc376655 ro quiet vga=792 nomodeset nouveau.modeset=0
        initrd /boot/initrd.img-3.0-4.slh.3-aptosid-amd64
}
### END /etc/grub.d/30_os-prober_proxy ###

$ hwinfo --framebuffer
02: None 00.0: 11001 VESA Framebuffer                           
  [Created at bios.459]
  Unique ID: rdCR.zn7pM8BU3A5
  Hardware Class: framebuffer
  Model: "NVIDIA BIOS-P/N@N7129"
  Vendor: "NVIDIA Corporation"
  Device: "BIOS-P/N@N7129"
  SubVendor: "NVIDIA"
  SubDevice: 
  Revision: "Chip Rev"
  Memory Size: 14 MB
  Memory Range: 0xcf000000-0xcfdfffff (rw)
  Mode 0x0300: 640x400 (+640), 8 bits
  Mode 0x0301: 640x480 (+640), 8 bits
  Mode 0x0303: 800x600 (+800), 8 bits
  Mode 0x030e: 320x200 (+640), 16 bits
  Mode 0x030f: 320x200 (+1280), 24 bits
  Mode 0x0311: 640x480 (+1280), 16 bits
  Mode 0x0312: 640x480 (+2560), 24 bits
  Mode 0x0314: 800x600 (+1600), 16 bits
  Mode 0x0315: 800x600 (+3200), 24 bits
  Mode 0x0330: 320x200 (+320), 8 bits
  Mode 0x0331: 320x400 (+320), 8 bits
  Mode 0x0332: 320x400 (+640), 16 bits
  Mode 0x0333: 320x400 (+1280), 24 bits
  Mode 0x0334: 320x240 (+320), 8 bits
  Mode 0x0335: 320x240 (+640), 16 bits
  Mode 0x0336: 320x240 (+1280), 24 bits
  Mode 0x033d: 640x400 (+1280), 16 bits
  Mode 0x033e: 640x400 (+2560), 24 bits

/etc/grub.d/40_custom

menuentry "Debian, Linux 2.6.39" {
        recordfail=1
        if [ -n ${have_grubenv} ]; then save_env recordfail; fi
    set quiet=1
    insmod ext4
    set root=(hd0,5)
    search --no-floppy --fs-uuid --set 0e717c2a-24bd-4abe-acfe-ecf98fc814f8
    linux    /boot/vmlinuz-2.6.39c root=UUID=0e717c2a-24bd-4abe-acfe-ecf98fc814f8 rw quiet vga=792 nomodeset
    initrd    /boot/initrd.img-2.6.39
}