我尝试将我的 Ubuntu 启动到启用详细程度的文本模式，这是我的配置/etc/default/grub：
GRUB_CMDLINE_LINUX_DEFAULT="text init=/sbin/init --verbose vga=791"
然后update-grub和reboot。然而，事实证明，启动输出的前半部分并不详细，大约 14 秒后才出现下半部分，并且很快就出现登录信息。
这是详细显示开始时的输出：
[ 12.902147] init: mounted-tmp state changed from waiting to starting
[ 12.902333] init: Handling starting event
[ 12.902786] init: mounted-tmp state changed from starting to pre-start
[ 12.902975] init: mounted-tmp state changed from pre-start to spawned
[ 12.914907] init: mounted-tmp main process (360)
[ 12.915188] init: mounted-tmp state changed from spawned to post-start
[ 12.919397] init: mounted-tmp state changed from post-start to running
[ 12.921018] init: Handling started event
[ 12.932362] init: Handling module-device-added event
[ 12.993888] init: Handling acpi-device-added event
[ 13.005511] init: Handling usb-device-added event
[ 13.024811] init: Handling acpi-device-added event
[ 13.039924] init: Handling acpi-device-added event
[ 13.096252] init: Handling acpi-device-added event
[ 13.108895] init: Handling acpi-device-added event
[ 13.109732] piix4_smbus 0000:00:07.0: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr
我还检查了日志文件中的输出消息确实完整/var/log/dmesg。
我真的很想看到启动时滚动的完整详细显示，有人有什么技巧吗？
附言：
- 客户操作系统：Ubuntu LTS 12.04
- 主机操作系统：Windows 7
- 使用 Oracle VirtualBox 4.1.18