- 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.original.efi (renamed bootmgfw.efi from Win7 SP1 64-bit Ultimate)
- 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:
bad1.jpg 136.93KB 2 downloads bad2.jpg 134.53KB 1 downloads
And this is what the screen shot looks like with the Print Screen key and pasted to the Paint and saved to .png file:
sshot.png 928.21KB 1 downloads
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 :
wpeinit.png 390.33KB 0 downloads
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?