Screen defect - Win7PE 64-bit on pure UEFI PC

[reboot12]

• I built ISO image Win7 PE SP1 64-bit from this builder: Win7PE_SE_2021-05-04.zip
• With Rufus I made a 16GB FAT32 pendrive in MBR partition scheme for UEFI (with GPT it is the same)
• I replaced loader UEFI on UefiSeven in the efi\boot folder - I deleted all files and copied these 3:
  bootx64.efi
  bootx64.original.efi (renamed bootmgfw.efi from Win7 SP1 64-bit Ultimate)
  UefiSeven.ini
• I boot a PC from this pendrive in pure UEFI mode (CSM disabled) and I have such a screen defect - photos taken with a digital camera:
  
  And this is what the screen shot looks like with the Print Screen key and pasted to the Paint and saved to .png file:
  

And now an interesting thing!

If I replace the sources\boot.wim file with KB3AIK_PL.iso\WinPE.cab\F3_WINPE.WIM and rename to boot.wim, there is no screen defect  :

The boot.wim file from KBAIK is based on Win7 SP0 but I also built Win7 PE SP0 and there is the same problem.

The same graphic driver is used in both boot.wim files: vga.sys 5.2.3790.1830 (VgaSave service)

boot.wim from Win7 PE - screen defect
boot.wim from KBAIK - screen OK

Why? What could be the reason?

Edited August 15, 2022 by reboot12

[jaclaz]

But which settings do you have for the video driver (resolution, number of colours, frequency, etc.)?

Maybe you need something like Setres to change that (automatically)?

https://atrandom.iansharpe.com/setres.php

jaclaz

[reboot12]

3 minutes ago, jaclaz said:

But which settings do you have for the video driver (resolution, number of colours, frequency, etc.)?

I use the default settings.

I tested the same WinPE also in legacy BIOS mode and there is no problem. The problem is only with pure UEFI.

[JFX]

You running in 8-bit color mode instead of 32-bit.

Screen resolution is changed booting Win7PE_SE. I guess it's done by PECMD.exe.
Click on the PECMD systray icon, maybe you have an option to set it back to 32-bit.

Edited August 15, 2022 by JFX

[reboot12]

@JFX

WinPE works in 1024x768 32-bit and it cannot be changed.

The 8-bit image (256 colors) looks completely different:

And once again, for comparison, the screen with a defect looks:

Edited August 15, 2022 by reboot12