How to toggle Linux Bootscreen Splash Bar / Progress Bar to Verbose details?
It is possible that you need to toggle your linux boot screen to display what exactly running in background instead of a splash screen. From CentOS/RHEL 6, they use Plymouth to load a default silent boot screen that is graphically beautiful but doesn’t provide any verbose output. Sometimes the boot screen freezes and without a detailed output you may not be able to identity the root reason of the cause. If you are on the bootscreen where a splashbar is running, press the following keys together:
ALT + d
That would toggle the splash screen to detailed output.
If you want to make the changes permanent, you need to edit the grub.conf file. Open grub.conf file using any of your favorite file editor:
nano /boot/grub/grub.conf
Find the entry “rhgb” & “quite”. And remove them from the lines start with “kernel”. Make sure, you keep the other things right, otherwise, it might cause a unbootable system. Here is an example:
kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=UUID=069fecd9-6a3f-4ec9-ac69-e86fefa8dad4 nomodeset rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_NO_LVM rd_NO_DM rhgb quite pcie_aspm=off biosdevname=0
Modified version:
kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=UUID=069fecd9-6a3f-4ec9-ac69-e86fefa8dad4 nomodeset rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_NO_LVM rd_NO_DM pcie_aspm=off biosdevname=0