RedHat 6.8 打开vga之后Login界面花屏

/*******************************************************************
 *             RedHat 6.8 打开vga之后Login界面花屏
 * 说明：
 *     主要原因是grub参数有问题。
 *
 *                               2017-3-11 深圳 南山平山村 曾剑锋
 ******************************************************************/

cat /boot/grub/grub.cfg
    # grub.conf generated by anaconda
    #
    # Note that you do not have to rerun grub after making changes to this file
    # NOTICE:  You have a /boot partition.  This means that
    #          all kernel and initrd paths are relative to /boot/, eg.
    #          root (hd0,)
    #          kernel /vmlinuz-version ro root=/dev/mapper/VolGroup-lv_root
    #          initrd /initrd-[generic-]version.img
    #boot=/dev/sda
    default=
    timeout=
    splashimage=(hd0,)/grub/splash.xpm.gz
    hiddenmenu
    title Red Hat Enterprise Linux Server (2.6.)
        root (hd0,)
        kernel /vmlinuz-2.6. ro root=/dev/mapper/VolGroup-lv_root nomodeset rd_NO_LUKS rd_NO_MD rd_LVM_LV=VolGroup/lv_swap crashkernel=128M LANG=zh_CN.UTF- rd_LVM_LV=VolGroup/lv_root  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
        initrd /initramfs-2.6..img
    title Red Hat Enterprise Linux  (2.6.-.el6.i686)
        root (hd0,)
        kernel /vmlinuz-2.6.-.el6.i686 ro root=/dev/mapper/VolGroup-lv_root rhgb .nr_uarts= vga=
        initrd /initrd-2.6.-.el6.i686.img