Sfdwhf

In Ubuntu 18.04.2, I would like to show a consistent background image from the start of Grub2 to the appearance of the GDM login screen.

I have customized the ubuntu-logo plymouth theme to show the background image that I would like. All the necessary procedures as described by @Jake were done, and tested. Even the test procedure described by @Jake were performed. However, the plymouth theme just does not appear. Between the Grub2 and GDM login stage, I still encounter 6-7 seconds of black screen each time the system boots up.

What can I do to discover the issue(s) for this black screen? How should I fix this missing splash screen issue.? The system uses NVidea driver version:418.56.

Remark: The system is able to boot up and login at the GDM login screen.

Update:

I introduced the following amendments to try to resolve my issue:

1. 
   

   I added the following commands in the default Grub2 file /etc/defaults/grub:

   
   
   

   GRUB_GFXMODE=1920x1080x32
GRUB_GFXPAYLOAD_LINUX="keep"

   
   
   

   According to GRUB_GFXPAYLOAD_LINUX, the value "keep" preserves the graphics mode set using GRUB_GFXMODE when the linux kernel is booted.

   
   
   

   The resolution of 1920x1080x32 was selected for GRUB_GFXMODE because it was the highest resolution available in the video driver detected by Grub2, which was a EFI GOP driver.

   
   
   

   To get available resolutions detected by Grub2, at the Grub2 menu during the boot phase, I pressed the keyboard 'c' key. Then at grub> prompt, I entered the command videoinfo (see Videoinfo); the command vbeinfo did not exist in Grub2.

   
   


2. 
   

   I created a splash file to set FRAMEBUFFER on with this terminal command:

   
   
   

   echo FRAMEBUFFER=y | sudo tee /etc/initramfs-tools/conf.d/splash

   
   



3. As a splash image is involved, I performed the amendments described in the section on Configuration settings (splash image present) in this ubuntu wiki.




4. Ran terminal commands: sudo update-initramfs -u and sudo update-grub

reference

Videoinfo:

grub> videoinfo

List of supported video modes:

Legend: mask/position=red,green,blue,reserved

Adapter 'Bochs PCI Video Driver':

  No info available

Adapter 'Cirruls CLGD 5446 PCI Video Driver':

  No info available

Adapter 'EFI GOP Driver':

* 0x000 1920 x 1080 x 32 (7680)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x001  640 x  480 x 32 (2560)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x002  800 x  600 x 32 (3200)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x003 1024 x  768 x 32 (3200)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x004 1280 x  800 x 32 (5120)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x005 1280 x 1024 x 32 (5120)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x006 1440 x  900 x 32 (5760)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x007 1400 x 1050 x 32 (5600)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  0x008 1680 x 1050 x 32 (6720)  Direct color, mask: 8/8/8/8  pos: 16/8/0/24

  EDID version: 1.3

    Preferred mode: 1920x1080

grub>

Issue:
During my many reboots checks, I am able now able to see the plymouth splash the I had implemented. However, the splash does not last till GDM login screen appears; the splash is still proceeded by a black text screen(see below images on 1st reboot and subsequents reboots), followed by a complete black screen, followed by then the GDM login screen appearing. Also, after I had made the above amendments, on the first reboot, the plymouth splash had appeared the longest. On my 2nd and subsequent reboots, the appearance of the splash was shortened.

1st Reboot(left) and Subequent Reboots(right):

Question: How can I avoid these black text screen and black blank screen which appears between the imaged filled plymouth-splash and gdm-login screens?